Brakes surging while driving. Peterbilt 348. Help!

The light on the switch does not indicate a fault. A fault lamp ABS or TCS will be displayed on the information center or Paccar display center of the dash cluster

 

Drive the truck and see if you can duplicate it. My guess is it will not do it when disabled.

 

Yes, ESC is integrated into the ABS system but with additional sensors such as yaw, steering angle, lateral acceleration. Failures in ESC can be attributed to ABS or ATC malfunctions. I would turn off the ATC and drive to see if the problem still occurs. Regardless of what the dash is saying (no faults) I would still want to connect a laptop or scan tool, and with Bendix software, to see if any faults or anything out of spec is happening.

 

With no faults the system is activating stability or traction control when it’s not needed.

Thats why I asked if the brake pedal may be stuck slight. Without the brake pedal being applied it’s not going into an ABS event.

Either way, a wheel end or wheel speed sensor issue is the most likely root cause of the problem at hand. The ABS controller is likely just doing what it’s told to do.

 

Yes correct.

Simply disabling the stability control on a truck that is equipped may cause other codes to show in engine or trans. But it may help narrow down the issue.

Bendix tech help is also a great resource




1800 AIR BRAKE