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Brake trouble...

97K2500

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97K2500 Enthusiast

97K2500

Posted
Posted

Hi, this is my 2nd post. Nice site!

 

My problem is my rear brakes lock up if my truck has been sitting for a period of time(overnight, during school, etc.) The truck is a '97 2500 8-lug with the drums in the rear. If the brake is applied, the pressure is firmer than usual and will lock up the rear brakes early in the stroke, after the lockup the pedal will lose pressure and the ABS will kick in. I have found that by doing this several times in a row, it will clear up, but it sure doesn't inspire confidence.

 

Anyone else have this problem?

 

Thanks,

Ben

Jacqson Enthusiast

Jacqson

Posted
Posted
Hi, this is my 2nd post. Nice site!

 

My problem is my rear brakes lock up if my truck has been sitting for a period of time(overnight, during school, etc.) The truck is a '97 2500 8-lug with the drums in the rear. If the brake is applied, the pressure is firmer than usual and will lock up the rear brakes early in the stroke, after the lockup the pedal will lose pressure and the ABS will kick in. I have found that by doing this several times in a row, it will clear up, but it sure doesn't inspire confidence.

 

Anyone else have this problem?

 

Thanks,

Ben

 

 

 

 

Are you using metallic or semi metallic shoes in the Rear. I had a 91 Suburban 2500 with rear drums and rear antilock,We also have a couple of 96s and 98s with rear drums at work and they all do the same thing. The only thing that seemed to help was using a shoe with little or no metal, mostly asbestos(Which is now illegal, At least in Canada). This change helped but it still did the same thing only not quite so bad.Also I would lock the rear brakes intentionally where it was safe and that seemed to cure the problem until next time they got cold. I went to the dealer I don't know how many times and they could not totally fix the problem. I ended up just living with it and was very careful when the brakes were cold. I think it has something to do with only having antilock in the rear. Sorry I can't shed any more light on this subject for you. :chevy::crackup:

97K2500 Enthusiast

97K2500

Posted
  • Author
Posted

 

 

 

 

 

Are you using metallic or semi metallic shoes in the Rear. I had a 91 Suburban 2500 with rear drums and rear antilock,We also have a couple of 96s and 98s with rear drums at work and they all do the same thing. The only thing that seemed to help was using a shoe with little or no metal, mostly asbestos(Which is now illegal, At least in Canada). This change helped but it still did the same thing only not quite so bad.Also I would lock the rear brakes intentionally where it was safe and that seemed to cure the problem until next time they got cold. I went to the dealer I don't know how many times and they could not totally fix the problem. I ended up just living with it and was very careful when the brakes were cold. I think it has something to do with only having antilock in the rear. Sorry I can't shed any more light on this subject for you. :seeya::banghead:

 

 

 

 

 

Thanks for the reply, I bought the truck from my mom, and I can't find the reciept from the last brake job. I would assume they are semi-metallic, but I could be wrong. Do these trucks really only have ABS in the rear? That seems preposterous for GM to put ABS on only one end, especially the rear. You would think it would be either just the front or both. You have to steer, right?! I tried to pull the drums off tonight, but I think I need a special tool. Once the axle stub is pulled out, there is a clip and a recessed nut with dimples for (I guess) a special tool. I like to do work myself, and a new tool is always a plus. :)

Oh, I forgot to mention that this problem first occured before freezing temperatures hit, and I use my parking brake constantly since I have a manual trans. Maybe that will help. Sorry for the length.

 

Thanks again,

Ben

Jacqson Enthusiast

Jacqson

Posted
Posted

 

 

 

 

 

Are you using metallic or semi metallic shoes in the Rear. I had a 91 Suburban 2500 with rear drums and rear antilock,We also have a couple of 96s and 98s with rear drums at work and they all do the same thing. The only thing that seemed to help was using a shoe with little or no metal, mostly asbestos(Which is now illegal, At least in Canada). This change helped but it still did the same thing only not quite so bad.Also I would lock the rear brakes intentionally where it was safe and that seemed to cure the problem until next time they got cold. I went to the dealer I don't know how many times and they could not totally fix the problem. I ended up just living with it and was very careful when the brakes were cold. I think it has something to do with only having antilock in the rear. Sorry I can't shed any more light on this subject for you. :):seeya:

 

 

 

 

 

Thanks for the reply, I bought the truck from my mom, and I can't find the reciept from the last brake job. I would assume they are semi-metallic, but I could be wrong. Do these trucks really only have ABS in the rear? That seems preposterous for GM to put ABS on only one end, especially the rear. You would think it would be either just the front or both. You have to steer, right?! I tried to pull the drums off tonight, but I think I need a special tool. Once the axle stub is pulled out, there is a clip and a recessed nut with dimples for (I guess) a special tool. I like to do work myself, and a new tool is always a plus. :)

Oh, I forgot to mention that this problem first occured before freezing temperatures hit, and I use my parking brake constantly since I have a manual trans. Maybe that will help. Sorry for the length.

 

Thanks again,

Ben

 

 

 

 

 

Yours may have 4-wheel antilock but my 91 only had rear wheel antilock and it only worked in 2 wheel drive,Go Figure :banghead: I think GM finally wised up when they went to 4 wheel discs in 2000. Maybe they figured out that 4 wheel antilock does not work that well in trucks with rear drums and front discs. Since I had that problem with my 91 I have seen that problem in a lot of GM 4x4 trucks that I drove with rear drum front disc and antilock brakes. Also, it doesn't have to be freezing for this problem to occur, just the rear drums being cold or wet.I wish I could give you more info but maybe someone else on the forum might have a solution. Yeah, GM is famous for having special tools to get some parts off their trucks. :chevy:

71GMC_3/4T Enthusiast

71GMC_3/4T

Posted
Posted

I had this very same problem on my 71 GMC 2500. The axle seal was leaking 90 wt oil and got on the brake pads. It was real sticky unless you backed up a few inches and broke it free. A new set of axle seals and brake pads cleared the problem.

You'll need to bend the nut keepers out of the way and remove the nut. There are timkin bearings, much like on the front of a 2wd. Clean and repack with a grease that's compatible with the 90wt and put a new seal in. Check the seal surfaces on the axle housing. You may need to speedy sleeve them. Check your 90 wt gear oil. If it's on the brake linings, it ain't in the housing any more...

Good Luck!

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