I have and 02 crew cab and i noticed at a stop light that my foot on the brake pedal was moving. Seemed to be losing pressure and my foot would slowly move towards the floor.

Nothing is leaking and fluid level has not changed. I figured it was the master cylinder so I changed it. Brakes seemed better but it is now starting to do the same thing. Truck started rolling forward at a stop light tonight with foot on brake.

Any thoughts on what to check next?

Thanks!

 

Bleed the system real good to check for air bubbles. We always did the farthest (right rear) wheel first and work forward

 

Brakes are bleed and it is acting the same way as it did before i replaced the MC.

I found a post a few years ago on another forum and a guy had the same problem as me. He replaced the MC 3 times and then changed the ABS control module.

It ended up being the module. Anybody ever changed one or have a part number?

 

Never changed one but my brakes are crappy also...

 

bump for the same issue. Just changed out my MC, did my best to bleed everything, and now the problem is still there, and worse. My ABS wasn't working beforehand due to a pump that wanted to run all the time, so the fuse was pulled. Looking at the Clymer/Hanyes manual they say that the ABS system can get air in it, and if that happens it needs to be towed to a dealer to be fixed. I know that the module is about $1000, so am hoping someone knows how to bleed the ABS system??? My other thoughts were to replace the soft lines to the wheels, since they are original (2000) but after that I'm gonna be a bit lost...