2008 GMC Sierra 1500 Brakes

[Gary A]

2008 GMC Sierra 1500 4WD

 

Something is causing front brakes to heat up. Replaced calipers, hoses, pads and rotors. Very strange. Has anyone ever seen a master or ABS hydraulic unit cause brakes to drag? Thats the only thing I can think of is that they are slightly dragging.

Edited January 4, 2011 by G Armando

[gravysuckinpig]

2008 GMC Sierra 1500 4WD

 

Something is causing front brakes to heat up. Replaced calipers, hoses, pads and rotors. Very strange. Has anyone ever seen a master or ABS hydraulic unit cause brakes to drag? Thats the only thing I can think of is that they are slightly dragging.

 

do you have a driver that rests their foot on the brake pedal while driving?

are rear brakes working?

did this problem exist before changing all those parts?

[Gary A]

do you have a driver that rests their foot on the brake pedal while driving? No. he put 170K on it already

are rear brakes working? Yes

did this problem exist before changing all those parts? Yes

[gravysuckinpig]

lift the truck up - try to spin front tires - if all is ok pump brakes a few times and respin tires - do this with engine off and also running - if they dont feel like they're dragging at all under either condition i would start working my way farther up the system - i know for a fact these trucks have problems with the braking system - but mostly the complaints are warped rotors and worn pads - you may have a severe case of whatever this problem is - possibly may not even be a brake problem - maybe check front axles and hub bearings- oversize wheels and tires? and - did your parts supplier in fact give you the right parts? if all checks out good let me know.

it may sound strange - but pull the master cyl off the brake booster - measure the rod depth - then measure it again with the vehicle running - 170k maybe weak diaphragm? check front suspension also - are the shocks blown? may not be dragging but simply being over worked.

let me know how it turns out

[Gary A]

I did find a rear adjuster that seemed frozen and rear brakes out of adjustment. They were adjusted last time according to my tech. Also what was driving me crazy was a pulsation. The pulsation ended up being rear drums needed cutting. The reason that I didnt think the pulsation was coming from the rear was because during a road test I had applied the E brake by itself and there was no pulsation. When I got the rear brakes adjusted tighter, the pulsation got worse so i cut the drums and everythings smooth now. Hopefully I wont see this again for a while. Thanks to all for your replies!

Edited January 6, 2011 by G Armando