New Caliper, Bled But Pedal Gives Out At End Of Stopping

[whtailhunter319]

Have an 04 GMC 2500HD. Had to replace brake lines from the master to the ABS module as well as from the front calipers to the ABS module as well as two calipers. Bled the lines in the proper order until all air was expelled. Brakes good until the very end the pedal goes soft and it feels almost like the ABS kicking in. ABS light performs a self test at startup but does not illuminate at any other time. Gone through the bleeding procedure 3 times with same results. What the heck could I be missing? Is there a bleeding procedure for the ABS module???

[Diesail]

There is procedure for the ABS and my understanding it is requires a Tech II to do the job and it should be no more than an hour labor charge now that you have done all the rest of the work.

[Shaners]

Quite possible something got bumped or greasy at the wheel pick-up sensor. My truck does the exact same thing and I haven't cleaned the wheel sensor yet, but I am 99% pos. it is the sensor on the rt frt wheel. There is a specific gap that is supposed to be at those sensors and if that gets changed you will have these symptoms. I have no ABS light on my dash either.

[233monte]

The procedure with the tech II operates the Abs solenoids. Snap on scanner may have it also but I'm not sure. I don't think you can get the Abs to run with out the scanner. I justvtried that today on grass and I couldn't get the abs to activate.

[markw8]

With new lines to the abs it will need to be bleed. Tech 2 or equivalint.

 

Mark

[snake428]

Snap-on scanner will do an automated bleed on the abs system any shop that is equipt with a scanner should be able to preform this for you.