Certain 536, 537, 548, and 567 chassis built with 2.1m Medium Duty End of Frame Trailer Connections and...
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, 548, and 567 chassis built with 2.1m Medium Duty End of Frame Trailer Connections and Tractor Protection Valves may not meet the standard trailer brake release timing requirements by 0.5 seconds. A delay in the trailer brake release may create momentary instability to the trailer and increase the risk of a crash.
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