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2006 Silverado lt- Rear brakes are locking up

anthonyaaa

By anthonyaaa
in Ask A GM Technician

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anthonyaaa New Member

anthonyaaa

Posted
Posted

I have changed the pads, the rotors, the calipers, abs sensors, bled the brakes , replaced the hoses, checked for any kind of leaks in brake system; I've pretty much changed and done everything and anything I can think of to fix this problem. Nothing has worked. And the many mechanics I have talked to can not figure it out either.

 

They lock up very often and unpredictably. I measured the temp of the rotors when I get home and it has been upward of 800 degrees. No, I'm not kidding. Can you offer up any ideas and or possible solutions? I am going broke trying to fix this problem. I live in San Jose, CA so it's not that east coast thing.

 

Any advice, solutions, ideas would be greatly appreciated. Also no sensors are showing that anything is wrong.

 

Thank you for any help given.

 

 

 

 

 

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

When I had my '06 and changed the brakes I had a problem with the rear brake shoes. The shoes actually had developed a ripple across the surface of the brake material. This seemed to cause my rears to lock up often. Once I had replaced them again, all was well. If it's the front, you may have a caliper getting hung up (slide pin need lubing?) Or it could be you need to bleed the brakes and make sure there is no air in the system.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Yeah I'd be checking the parking brake too. This is one of the crappiest designs I have ever seen in my life - constant problems with them, especially when you throw a little salt in the mix here in the Northeast.

 

Haven't had a single problem with the drum rears on my '07, aside from the chinese drums that were constantly out-of-round when it was new ... $600 a pair back then too!! :noway: Thank God for warranties ...

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

I have changed the pads, the rotors, the calipers, abs sensors, bled the brakes , replaced the hoses, checked for any kind of leaks in brake system; I've pretty much changed and done everything and anything I can think of to fix this problem. Nothing has worked. And the many mechanics I have talked to can not figure it out either.

 

They lock up very often and unpredictably. I measured the temp of the rotors when I get home and it has been upward of 800 degrees. No, I'm not kidding. Can you offer up any ideas and or possible solutions? I am going broke trying to fix this problem. I live in San Jose, CA so it's not that east coast thing.

 

Any advice, solutions, ideas would be greatly appreciated. Also no sensors are showing that anything is wrong.

 

Thank you for any help given.

 

When you measured the high rotor temp what was the driving like right before that? For example, did you just come off the highway, pull in driveway and then check temps?

 

When you say brakes lock up, are you saying that they lock when you apply the brakes, or are you saying that the longer you drive the more the rear brakes drag, eventually reaching a point that they simply lock up?

 

Can you reach the bleeder screw on the rear calipers with the wheels on, and the truck just sitting on the road? If so, get the truck to start locking up, stop and park the truck, then crack open the bleeder screw on the caliper that is showing the highest rotor temp. You should only see brake fluid trickle out. If you are getting a healthy squirt of fluid (like there is pressure being applied) then something is leaving pressure applied to the brake caliper.

 

Starting at the master cylinder, if the master has been replaced and the wrong master cylinder was installed(eg drum/disk instead of disk/disk master cyl) it may be covering the compensating port for the rear brakes. If that port is blocked, any pressure created by a dragging caliper heating the fluid will not be realised by master cylinder. A misadjusted connecting rod between booster and master may also hold the master cylinder over the compensating port. A very quick but crude way of checking that the rod is not too long is to unbolt the master cylinder from booster and put a couple of washers on each stud to move the master out eighth of an inch or so. Do not get carried away with this, if this is the cause it will not take much to make a difference. Do not leave it like this for normal driving, use as a test only.

BTW, simply opening the bleeder screw on the caliper will not put air in system provided you break it loose, and tighten it back up right away.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I have changed the pads, the rotors, the calipers, abs sensors, bled the brakes , replaced the hoses, checked for any kind of leaks in brake system; I've pretty much changed and done everything and anything I can think of to fix this problem. Nothing has worked. And the many mechanics I have talked to can not figure it out either.

 

They lock up very often and unpredictably. I measured the temp of the rotors when I get home and it has been upward of 800 degrees. No, I'm not kidding. Can you offer up any ideas and or possible solutions? I am going broke trying to fix this problem. I live in San Jose, CA so it's not that east coast thing.

 

Any advice, solutions, ideas would be greatly appreciated. Also no sensors are showing that anything is wrong.

 

Thank you for any help given.

 

Unfortunately you have found this site AFTER you have hemoraged serious cash by guessing ,,,, and now the sky's should open up upon you and give you Devine diagnoses .......... Seriously ?

 

People here are guessing as to WTF kind of rear brakes you have , so I'll just sit back and eat popcorn , I've never heard of this level of crazy in awhile as brakes locking up ,

 

Just take it to real garage cuz internet will NOT bail your butt out of this one ,

 

There is simple to much to diagnose , I'm sorry , you know I'm rite ,,,

 

Tell us what you find out for giggles

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