SC0433 – Park Brake Control Valve – 2008-2022 Mack TerraPro

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Date Number Release Page 12.2021 SC0433 01 1(9) Park Brake Control Valve MRU, TE RECALL INFORMATION (December, 2021) Mack has determined that certain model year 2008 – 2022 trucks may experience a worn PP1 valve (park brake control valve) exhibiting an internal leak that may cause air to pass through and out the exhaust port when the park brake is applied. Under certain conditions, the internal leak in combination with the installation of an exhaust hose may result in back pressure sufficient to allow the park brakes to release. To help address this safety concern, Mack is releasing this recall to remove the park brake control valve vent line and fitting, and notifying owners of Bendix’s guiding document for inspection and replacement of the park brake control valve.VEHICLES AFFECTED Certain 2008 – 2022 Mack TerraPro (MRU, TE) model vehicles manufactured from January 4, 2007 through December 6, 2021. VEHICLE QUANTITY There are 23,473 vehicles affected by this recall (20,668 U.S., 2,624 Canada, 181 Export). Safety Recall Mack Trucks Inc. Greensboro, NC USA Page 2 of 7 Repair Instructions 1.Secure vehicle for service. 2.Ensure the ignition switch is in the off position and disconnect the negative battery cable. 3.Remove the instrument cluster module and lay forward. 4.Remove HVAC (heating ventilation air conditioning) panel. Mack Truck Inc. Safety Recall Date 12.2021 Page 3 of 7 5. Remove outer steering column cover. 6. Remove inner steering column cover. 7. Remove Lower right kick panel. Page 4 of 7 8. Remove the roll pin and the park brake button. Also remove the brake handle knob. 9. Remove the secondary gauge panel. Mack Truck Inc. Safety Recall Date 12.2021 Page 5 of 7 10. With all the panels removed, locate the park brake control valve (PP1) vent line. The vent line is directly opposite the yellow push pull button. 11. Cut the park brake control valve (PP1) vent line and remove the vent line fitting. Page 6 of 7 12.Reassemble vehicle in reverse operation of disassembly. Torque for the interior panel fastenersis 10 Nm ± 1.5 (7 lbf-ft ± 1). Mack Truck Inc. Safety Recall Date 12.2021 Page 7 of 7 NOTE: The left behind vent line can be left in place with no consequence. With the vent line and fitting removed the venting air will be heard by the operator every time the park brake valve is cycled. The sound of venting air will need to be explained to the operator/owner as normal operation. NOTE: The park brake valve (aka PP1) does have an inspection process mandated by the manufacture. The guiding document for inspection and replacement is the Bendix bulletin number TCH-003-056. This document can be found by visiting Bendix.com – Document Library – search “TCH-003-056”. This process should be read and followed for the life of the vehicle. See page 8 for attached document. 13. Release the vehicle to service. REIMBURSEMENT This repair is covered by an authorized safety recall. Reimbursement is obtained through the normal claim handling process. UCHP Reimbursement Claim Type (used only when uploading from the Dealer Business System) 40 Recall Status Vehicle repaired per instructions 1-Modified per instructions Labor Codes Primary Labor Code: 1720-16-09-01 Campaign, General (0.1 x 6) 0.6 Causal Part 25117989 Authorization Number SC0433 Note: Dealers are to perform Safety Recall on all subject vehicles at no charge to the vehicle owner regardless of mileage, age of vehicle or ownership (original purchaser or subsequent purchasers). Whenever vehicles are subject to a Safety Recall are brought to your dealership for service, or taken into your dealership vehicle inventory, it is strongly recommended that every effort be made to perform the recall correction before the vehicle is sold or released to the owner. Technical Bulletin Bulletin No: TCH-003-056 Effective Date: 11-20-2019 Cancels: N/A Page: 1 of 1 Subject: BENDIX® PP-1® & PP-8™ PARK CONTROL VALVE WEAR AND REPLACEMENT NOTICE © 2019 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group. All Rights Reserved Bendix® PP-1® Control Valve This bulletin applies to all Bendix® PP-1® and PP-8™ valves in applications where the exhaust port is plumbed external to the cab. It is mostly applicable to vehicles used in high-park-brake-cycle count applications, like refuse vehicles or city buses. When a heavily-worn PP-1 or PP-8 control valve is combined with restrictive exhaust plumbing, the vehicle park brake force may be reduced. Valve wear may be the result of high-park-brake-cycle count and/or sideloading. Sideloading can be caused by pushing or pulling the valve button at an angle and not in line with the valve or from hanging objects from the button. See the table below for troubleshooting recommendations. DIAGNOSING A LEAKING PP-1 AND PP-8 PARK CONTROL VALVE When performing any inspection or service, follow the steps below and refer to the guidelines outlined in the PP-1 and PP-8 Service Data sheet SD-03-3611, or instruction sheet as applicable. 1.Run the vehicle until the air system reaches full reservoir pressure (120-135 psi). Turn off the vehicle. 2.Move the control valve button & plunger from side to side and up and down. Do not push the button in. If thereis any play, or if audible leakage is detected, the valve must be replaced. 3. Identify the dash valve exhaust hose location (generally near the grill). With the button pulled out (exhaust position),there should be no audible leakage. Rotate the button and plunger in a clockwise direction – stopping every 90ºto check for leakage. A second inspector near the end of the exhaust hose would be helpful for this procedure.There should be no audible leakage in the cab or from the exhaust hose at any point of rotation. Using a soapsolution, check for leaks. The allowable leakage should not exceed a 1” bubble in 5 seconds at any location onthe valve. 4.Push the button in (applied position) and check for leaks. The leakage should not exceed a 1” bubble in 3 secondsat any location on the valve. 5.Reduce the supply pressure. At a pressure from 60 to 20 psi, depending on the spring installed, the button shouldpop out automatically, exhausting the delivery volume. (This does not apply to the PP-8 or some PP-1 valveswithout an automatic exhaust feature). Bendix® PP-8™ Control Valve Exhaust Port Located here for PP-1 & PP-8 valves Valve Bottom View PP-1 Bendix® Valve Model Exhaust Port Recommendation Port Size Fitting Tube PP-1® & PP-8™ 1/8” NPT No No Maintain valve per Service Data sheet SD-03-3611. Yes Yes or No Follow the procedure below. 1/4” NPT No No Maintain valve per Service Data sheet SD-03-3611. Yes Less than 1/2” OD Follow the procedure below. For additional assistance contact the Bendix Tech Team at 1-800-AIR-BRAKE, option 2 (1-800-247-2725, option 2) or techteam@bendix.com.

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SC0433_OWNER_LTR February 2022 DEAR MACK TRUCK OWNER: This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Mack Trucks, Inc. has decided that a defect which relates to motor vehicle safety may exist in certain 2008 – 2022 Mack TerraPro (MRU, TE) model vehicles manufactured from January 4, 2007 through December 6, 2021. SAFETY DEFECT: On certain trucks, the parking brake control valve may wear and leak. In certain situations, this could cause the parking brake to release suddenly and the truck could roll away. SAFETY RISK: A parked vehicle that moves suddenly could increase the risk of an injury or a crash. PRECAUTIONS YOU CAN TAKE: TIME REQUIRED FOR THE REPAIR: There are no precautions you can take other than having your vehicle repaired by a Mack Parts and Service Center. The time required to inspect and/or repair your vehicle is approximately 1 hour. WHAT YOU SHOULD DO: You should contact the nearest Mack Parts and Service Center and make an appointment. Mack dealer will remove the exhaust tube and fitting from the parking brake control valve. at no cost to you. You can locate the closest Mack Parts and Service Center by going on line to http://www.macktrucks.com/ and selecting “Dealer & Service Locations” or by calling our toll-free number: 1-800-866-1177. IMPORTANT SAFETY RECALL SC0433 NHTSA RECALL # 21V-953 SC0433_OWNER_LTR February 2022 NOTICE REGARDING LEASED VEHICLES: If you are a Lessor of vehicles subject to this Notice, you have an obligation under Federal Law to provide a copy of this Notice to all Lessees within 10 days of your receipt of this Notice. Further, you must maintain a record, which identifies the Lessee(s) to whom you send a copy of this letter, the date you send this letter, and the Vehicle Identification Number(s) of the vehicle(s) that you have leased to that lessee. For purposes of this Notice, the term Lessor means: a person or entity that is the owner, as reflected on the vehicle’s title, of any five or more leased vehicles (as defined in CFR Section 577.4), as of the date of notification by the manufacturer of the existence of a safety-related defect or non-compliance with a Federal Motor Vehicle Safety Standard in one or more of the leased motor vehicles. OWNER RECALL RESPONSE CARD: The enclosed “Notice of Vehicle Recall” identifies your vehicle. If you no longer own the vehicle, please help us update our records by completing the “Vehicle Disposition Record” portion of the enclosed postage-free Notice of Mandatory Safety Campaign card and mailing it back to us. ASSISTANCE/ COMPLAINTS: PRE NOTIFICATION REMEDIES: If your vehicle has not been repaired within a reasonable time after delivering it to a Mack Parts and Service Center, please contact: Mack Trucks, Inc. Regulatory Affairs Department, P.O. Box 26115 Greensboro, NC 27402-6115 vtna.regulatoryaffairs@volvo.com You may also submit complaints to the Administrator of the National Highway Traffic Safety Administration (1200 New Jersey Avenue, S.E., Washington DC 20590 or call the toll-free Auto Safety Hot Line at 1-888-327-4236 (TTY: 1-800-424-9153), or go to http://www.safercar.gov if you believe that Mack has failed to remedy the defect without charge, or has failed to remedy the vehicle within 60 days of the owners first tender to obtain repair following the earliest time that parts are available. If you have previously paid for repairs as a result of this issue, you may be entitled to recovery of those expenses. Submit copies of all documentation supporting your claim according to the rules specified in the “General Plan for Reimbursement of Pre-notification Remedies” provided in this mailing. We regret any inconvenience this may cause to your operation, but hope you will appreciate our sincere efforts to demonstrate Mack’s commitment to provide our customers with the best possible product. MACK TRUCKS, INC.

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MACK TRUCKS RECALL ALERT © Mack Trucks, Inc. CONFIDENTIAL – For limited distribution only to circulation list above. This bulletin, and any information herein, is subject to change by Company without notice. For the most current and accurate information, always refer to Trucks Dealer Portal for the electronic version of this document. Description A worn PP1 valve (park brake control valve) exhibiting an internal leak may cause air to pass through and out the exhaust port when the park brake is applied. Under certain conditions, the internal leak in combination with the installation of an exhaust hose may result in back pressure sufficient to allow the park brakes to release. This results in a potential of a vehicle rollaway with the park brake control valve in the on/applied position, which may result in a vehicle crash, property damage and/or personal injury. The exhaust tube and fitting will be removed from the valve. With the exhaust tube removed, a notable rush of air may now be heard from behind the dash during park brake apply. This is normal. Model and Model Years Affected • Certain 2008 – 2022 Mack TerraPro (MRU, TE) model vehicles manufactured from January 4, 2007 through December 6, 2021. Vehicle Quantities • 23,473 (20,668 US, 2,624 Canada, 181 Export) Dealer Responsibilities • The National Traffic and Motor Vehicle Safety Act and Canadian Motor Vehicle Safety Act require dealers to ensure that all new and used vehicles are free of safety defects and comply with all relevant safety standards at the time of delivery to the consumer. • Dealers should make their personnel aware of the safety recall. In the event that a dealer has a vehicle included in the safety recall in their inventory to be sold, the condition must be corrected before releasing it to a customer. Notification Release Schedule • Vehicle list will be posted on the Trucks Dealer Portal on December 17, 2021 • Owner notification letters will be released on or before February 4, 2022 Contact If you have questions or concerns about this recall, contact the Regulatory Affairs Department at vtna.regulatoryaffairs@volvo.com. Subject: Safety Recall SC433, Park Brake Control Valve Recall Number: SRA-M433 Date: December 17, 2021 Applicable Markets: ☒U.S. ☒Canada ☒ Export

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-953 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Mack Trucks, Inc. Submission Date : DEC 16, 2021 NHTSA Recall No. : 21V-953 Manufacturer Recall No. : SC0433 Manufacturer Information : Manufacturer Name : Mack Trucks, Inc. Address : 2100 Mack Boulevard PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131 Population : Number of potentially involved : 20,668 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2008-2022 Mack TerraPro (MRU and TE) Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The recall population is based on vehicles equipped with a PP1 valve fitted with a exhaust fitting and tube. The total number of vehicles affected that were sold in the U.S. is 21,641 in total. The models and model years affected by the recall is 2008 – 2019 TerraPro (MRU’s) and 2019 to 2022 TerraPro (TE) models Production Dates : JAN 04, 2007 – DEC 06, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A worn PP1 valve (park brake control valve) exhibiting an internal leak may cause air to pass through and out the exhaust port when the park brake is applied. Under certain conditions, the internal leak in combination with the installation of an exhaust hose may result in back pressure sufficient to allow the park brakes to release. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Potential of a vehicle rollaway with the park brake control valve in the on/ applied position, which may result in a vehicle crash, property damage and/ or personal injury. Description of the Cause : Combination of factors – internal leak path in the valve that exceeds the capacity of the air line to vent the volume of air resulting in back pressure. Part 573 Safety Recall Report 21V-953 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : Leakage of the valve and air exiting the exhaust pipe when the park brake is applied. Involved Components : Component Name 1 : PP1 Valve combined with exhaust tube. Component Description : Dash mounted park brake control valve used to apply and release the valve. Fitting and air tube attached to the valve’s exhaust port. Component Part Number : 25117989 Supplier Identification : Component Manufacturer Name : Bendix Commercial Vehicle Systems LLC Address : 901 Cleveland St Elyria Ohio 44035 Country : United States Chronology : May 30, 2019 Mack notified of incident involving a Mack MRU. Jun 6, 2019 Joint inspection of vehicle performed; components removed for further examination. Jun 14, 2019 Mack informs NHTSA of incident/ investigation. Jun 18, 2019 Mack provides notes/ minutes to investigation team. Jul 19, 2019 Mack receives results on valves removed from fleet owner’s vehicles. Valves deemed as worn and leaking requiring replacement. Feb 2020 Incident reported to Mack. Team deployed to investigate matter. Mack informs NHTSA of the report/ investigation. Mar 2020 Results of investigation received. No issues found with brake system. Information shared with owner. Apr 1, 2020 NHTSA opens PE20-003 to further investigate matter. Apr 20, 2020 Mack receives PE questionnaire from NHTSA. Jun 1, 2020 Mack responds to NHTSA’s inquiry. Jul 23, 2020 Investigation raised for review at Mack’s Product Safety Committee (PSC). PSC supports conclusion of Product Safety Working Group (PSWG) that the reports are not associated with a safety defect. Aug 10, 2020 Informs that Mack’s position is that the reported concern is not a safety defect. Aug 16, 2021 Mack Sales team receives a report of an incident involving a 12-year-old rear load packer. Aug 20, 2021 Additional information provided to Mack regarding the incident. Part 573 Safety Recall Report 21V-953 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Aug 27, 2021 Mack PSWG informed of incident. Mack informs NHTSA of the report. Sept 8, 2021 Mack facilitates a mtg with NHTA, Owner, and supplier. Sept 15, 2021 Additional information shared with all parties; including information that the valve installed in the vehicle was an aftermarket replacement (not an OE replacement and different brand/ size). Sept 30, 2021 PSC meets and re-visits case. Additional information required. Dec 2, 2021 PSWG presents findings to PSC. PSC determines a safety defect. Dec 9, 2021 Mack submits defect report to NHTSA. There are 2 consumer complaints, 3 field reports, and 5 reports involving a crash and/or injury. Description of Remedy : Description of Remedy Program : The exhaust tube and fitting will be removed from the valve. Prenotification remedies will be addressed according to Mack’s reimbursement plan on file with NHTSA. How Remedy Component Differs from Recalled Component : The exhaust tube and fitting are removed. Identify How/When Recall Condition was Corrected in Production : A stop delivery was issued on December 6, 2021 Recall Schedule : Description of Recall Schedule : Dealer notification will occur by Dec. 17, 2021. Owner letters will ne released on or before February 4, 2022. Planned Dealer Notification Date : DEC 17, 2021 – DEC 17, 2021 Planned Owner Notification Date : FEB 04, 2022 – FEB 04, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-953 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Mack Trucks, Inc. Submission Date : DEC 09, 2021 NHTSA Recall No. : 21V-953 Manufacturer Recall No. : SC0433 Manufacturer Information : Manufacturer Name : Mack Trucks, Inc. Address : 2100 Mack Boulevard PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131 Population : Number of potentially involved : 21,641 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2008-2022 Mack TerraPro (MRU and TE) Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The recall population is based on vehicles equipped with a PP1 valve fitted with a exhaust fitting and tube. The total number of vehicles affected that were sold in the U.S. is 21,641 in total. The models and model years affected by the recall is 2008 – 2019 TerraPro (MRU’s) and 2019 to 2022 TerraPro (TE) models Production Dates : JAN 04, 2007 – DEC 06, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A worn PP1 valve (park brake control valve) exhibiting an internal leak may cause air to pass through and out the exhaust port when the park brake is applied. Under certain conditions, the internal leak in combination with the installation of an exhaust hose may result in back pressure sufficient to allow the park brakes to release. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Potential of a vehicle rollaway with the park brake control valve in the on/ applied position, which may result in a vehicle crash, property damage and/ or personal injury. Description of the Cause : Combination of factors – internal leak path in the valve that exceeds the capacity of the air line to vent the volume of air resulting in back pressure. Part 573 Safety Recall Report 21V-953 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : Leakage of the valve and air exiting the exhaust pipe when the park brake is applied. Involved Components : Component Name 1 : PP1 Valve combined with exhaust tube. Component Description : Dash mounted park brake control valve used to apply and release the valve. Fitting and air tube attached to the valve’s exhaust port. Component Part Number : 25117989 Supplier Identification : Component Manufacturer Name : Bendix Commercial Vehicle Systems LLC Address : 901 Cleveland St Elyria Ohio 44035 Country : United States Chronology : May 30, 2019 Mack notified of incident involving a Mack MRU. Jun 6, 2019 Joint inspection of vehicle performed; components removed for further examination. Jun 14, 2019 Mack informs NHTSA of incident/ investigation. Jun 18, 2019 Mack provides notes/ minutes to investigation team. Jul 19, 2019 Mack receives results on valves removed from fleet owner’s vehicles. Valves deemed as worn and leaking requiring replacement. Feb 2020 Incident reported to Mack. Team deployed to investigate matter. Mack informs NHTSA of the report/ investigation. Mar 2020 Results of investigation received. No issues found with brake system. Information shared with owner. Apr 1, 2020 NHTSA opens PE20-003 to further investigate matter. Apr 20, 2020 Mack receives PE questionnaire from NHTSA. Jun 1, 2020 Mack responds to NHTSA’s inquiry. Jul 23, 2020 Investigation raised for review at Mack’s Product Safety Committee (PSC). PSC supports conclusion of Product Safety Working Group (PSWG) that the reports are not associated with a safety defect. Aug 10, 2020 Informs that Mack’s position is that the reported concern is not a safety defect. Aug 16, 2021 Mack Sales team receives a report of an incident involving a 12-year-old rear load packer. Aug 20, 2021 Additional information provided to Mack regarding the incident. Part 573 Safety Recall Report 21V-953 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Aug 27, 2021 Mack PSWG informed of incident. Mack informs NHTSA of the report. Sept 8, 2021 Mack facilitates a mtg with NHTA, Owner, and supplier. Sept 15, 2021 Additional information shared with all parties; including information that the valve installed in the vehicle was an aftermarket replacement (not an OE replacement and different brand/ size). Sept 30, 2021 PSC meets and re-visits case. Additional information required. Dec 2, 2021 PSWG presents findings to PSC. PSC determines a safety defect. Dec 9, 2021 Mack submits defect report to NHTSA. There are 2 consumer complaints, 3 field reports, and 5 reports involving a crash and/or injury. Description of Remedy : Description of Remedy Program : The exhaust tube and fitting will be removed from the valve. Prenotification remedies will be addressed according to Mack’s reimbursement plan on file with NHTSA. How Remedy Component Differs from Recalled Component : The exhaust tube and fitting are removed. Identify How/When Recall Condition was Corrected in Production : A stop delivery was issued on December 6, 2021 Recall Schedule : Description of Recall Schedule : Dealer notification will occur by Dec. 17, 2021. Owner letters will ne released on or before February 4, 2022. Planned Dealer Notification Date : DEC 17, 2021 – DEC 17, 2021 Planned Owner Notification Date : FEB 04, 2022 – FEB 04, 2022 * NR – Not Reported

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 21V-953 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Mack Trucks, Inc. Submission Date : DEC 16, 2021 NHTSA Recall No. : 21V-953 Manufacturer Recall No. : SC0433 Manufacturer Information : Manufacturer Name : Mack Trucks, Inc. Address : 2100 Mack Boulevard PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131 Population : Number of potentially involved : 20,668 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2008-2022 Mack TerraPro (MRU and TE) Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : The recall population is based on vehicles equipped with a PP1 valve fitted with a exhaust fitting and tube. The total number of vehicles affected that were sold in the U.S. is 21,641 in total. The models and model years affected by the recall is 2008 – 2019 TerraPro (MRU’s) and 2019 to 2022 TerraPro (TE) models Production Dates : JAN 04, 2007 – DEC 06, 2021 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : A worn PP1 valve (park brake control valve) exhibiting an internal leak may cause air to pass through and out the exhaust port when the park brake is applied. Under certain conditions, the internal leak in combination with the installation of an exhaust hose may result in back pressure sufficient to allow the park brakes to release. FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Potential of a vehicle rollaway with the park brake control valve in the on/ applied position, which may result in a vehicle crash, property damage and/ or personal injury. Description of the Cause : Combination of factors – internal leak path in the valve that exceeds the capacity of the air line to vent the volume of air resulting in back pressure. Part 573 Safety Recall Report 21V-953 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Identification of Any Warning that can Occur : Leakage of the valve and air exiting the exhaust pipe when the park brake is applied. Involved Components : Component Name 1 : PP1 Valve combined with exhaust tube. Component Description : Dash mounted park brake control valve used to apply and release the valve. Fitting and air tube attached to the valve’s exhaust port. Component Part Number : 25117989 Supplier Identification : Component Manufacturer Name : Bendix Commercial Vehicle Systems LLC Address : 901 Cleveland St Elyria Ohio 44035 Country : United States Chronology : May 30, 2019 Mack notified of incident involving a Mack MRU. Jun 6, 2019 Joint inspection of vehicle performed; components removed for further examination. Jun 14, 2019 Mack informs NHTSA of incident/ investigation. Jun 18, 2019 Mack provides notes/ minutes to investigation team. Jul 19, 2019 Mack receives results on valves removed from fleet owner’s vehicles. Valves deemed as worn and leaking requiring replacement. Feb 2020 Incident reported to Mack. Team deployed to investigate matter. Mack informs NHTSA of the report/ investigation. Mar 2020 Results of investigation received. No issues found with brake system. Information shared with owner. Apr 1, 2020 NHTSA opens PE20-003 to further investigate matter. Apr 20, 2020 Mack receives PE questionnaire from NHTSA. Jun 1, 2020 Mack responds to NHTSA’s inquiry. Jul 23, 2020 Investigation raised for review at Mack’s Product Safety Committee (PSC). PSC supports conclusion of Product Safety Working Group (PSWG) that the reports are not associated with a safety defect. Aug 10, 2020 Informs that Mack’s position is that the reported concern is not a safety defect. Aug 16, 2021 Mack Sales team receives a report of an incident involving a 12-year-old rear load packer. Aug 20, 2021 Additional information provided to Mack regarding the incident. Part 573 Safety Recall Report 21V-953 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Aug 27, 2021 Mack PSWG informed of incident. Mack informs NHTSA of the report. Sept 8, 2021 Mack facilitates a mtg with NHTA, Owner, and supplier. Sept 15, 2021 Additional information shared with all parties; including information that the valve installed in the vehicle was an aftermarket replacement (not an OE replacement and different brand/ size). Sept 30, 2021 PSC meets and re-visits case. Additional information required. Dec 2, 2021 PSWG presents findings to PSC. PSC determines a safety defect. Dec 9, 2021 Mack submits defect report to NHTSA. There are 2 consumer complaints, 3 field reports, and 5 reports involving a crash and/or injury. Description of Remedy : Description of Remedy Program : The exhaust tube and fitting will be removed from the valve. Prenotification remedies will be addressed according to Mack’s reimbursement plan on file with NHTSA. How Remedy Component Differs from Recalled Component : The exhaust tube and fitting are removed. Identify How/When Recall Condition was Corrected in Production : A stop delivery was issued on December 6, 2021 Recall Schedule : Description of Recall Schedule : Dealer notification will occur by Dec. 17, 2021. Owner letters will ne released on or before February 4, 2022. Planned Dealer Notification Date : DEC 17, 2021 – DEC 17, 2021 Planned Owner Notification Date : FEB 04, 2022 – FEB 04, 2022 * NR – Not Reported

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