Rear brakes are driving me insane!


carlos crayon
01-13-2010, 04:23 PM
hi i have a 2004 chevrolet colorado extended cab base model 2 wheel drive, and ive been having problems with my rear brakes since day 1 (it is a second hand truck) and well preety much what heppens is when i hit the breaks the truck stumbles and shakes and what not, now im well aware those are all the symptoms of warped rotors and ovaled or deformed drums, so the first thing i did was replce my entire brake system.... well new front rotors new rear drums and shoes, and well the front brakes work like magic :), but the rear brakes despite everything being new THEY STILL SHAKE AND WOBBLE:mad:! so same thing as before its as if the drums are defective, so i ran them on on my lathe and using a dial indicator i left them dead acurate and true, within 1 thousands of an inch actually =], and wouldent you know it as soon i i put them back same story shaknig and wobnlin, so i know its not the drums,....what else could it be?....for the record my axel is not bent.... HELP!!!!:frown:

rhandwor
01-13-2010, 07:49 PM
I've had to file the edges of some brake shoes this is the edge as they weren't done properly. Some places can arc them to the drum. Filing always worked for my purpose.
Also their is a front and back show look at your manual and make sure this is correct.

carlos crayon
01-14-2010, 05:34 PM
theres a front and back?, what do you mean by that?

rhandwor
01-14-2010, 06:24 PM
The 4 shoes are not identical the shoe length is shorter on one. Their should be two of each. Its best to do one side at a time so you can look how they were set. The springs and self adjusters have to be put on correctly. If you don't do it every day its easy to get mixed up. I sand the leading edge of the shoe so it doesn't grab.

carlos crayon
01-14-2010, 06:31 PM
ohhh okay ill make sure to check that out! and wich ones the lead edge, the one on top?

rhandwor
01-14-2010, 06:54 PM
Just file the narrow part of the shoe top and bottom a slight taper.

consultIII
01-14-2010, 07:04 PM
to clarify:

Is the shake and pulsation felt:

1. in the brake pedal
2. through the body and seat
3. steering wheel

When you apply only the e-brake when road testing is the symptom still there?

If brake wheel cylinders are moving normally and rest of brake system checks out perform a suspension check.

suspension components that are not operating properly may cause a disturbance to the vehicle during brake application.

carlos crayon
01-14-2010, 07:07 PM
its felt through the body an seat and brake pedal and yes it is also felt on the e brake

consultIII
01-16-2010, 02:18 PM
check your rear driveshaft u-joints. The drive line angle will change as you brake as the nose of the rear diff drops which would cause a worn joint to cause a vibration. Is a quick and easy check and at least will rule it out.

consultIII
01-18-2010, 01:25 PM
I know you said its not a bent axle. Did you take a runout measurement of the axle flange to rule it out. just that the symptoms sure sound like that it what it is.

carlos crayon
01-21-2010, 02:05 PM
no i havent im going to check it thought just to be sure, thanks

carlos crayon
01-21-2010, 02:06 PM
no i havent im going to check it thought just to be sure, thanks

Add your comment to this topic!