Certain 536, 537, and 548 chassis built with 2.1m Medium Duty End of Frame Trailer Connections may exceed...
Peterbilt technical service bulletin 23PBJ for 2020-2024 Peterbilt 548, 2020-2024 Peterbilt 537 and 2020-2024 Peterbilt 536.
- Bulletin number
- 23PBJ
- Component
- Service brakes, air
- Summary
- Certain 536, 537, and 548 chassis built with 2.1m Medium Duty End of Frame Trailer Connections may exceed the standard trailer brake release timing requirements by 0.5 seconds due to the size of the tractor protection valve fitting and hose. A delay in the trailer brake release can create instability to the trailer and increase the risk of a crash.
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