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O.T. 1995 SUBURBAN BRAKES

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Kevin (FL)

11-01-2006 13:07:32

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Greetings from the FL panhandle. I know this isn"t a tractor question but I"m hoping some of you can help me out. This is a C2500 diesel with over 200K miles. I recently replaced the front disc pads and calipers and the rear brake shoes. I did the usual bleeding and adding brake fluid as needed after bleeding. The problem we"re having is that the rear shoes are sticking/grabbing--they almost lock up at slow speeds. At first I thought the brake cylinders were the problem so I R&R"d those. I"ve gotten suggestions that the rear springs may be weak but that seems to be a long shot. I"ve never seen brake springs cause a problem (unless they broke). Other folks have suggested a bad master cylinder too. And I"ve also had problems with the front brakes sticking due to collapsed (internally) hoses, but near as I can tell, the rear brake lines on this one are all steel tubing. Last thing--I also checked for rear seal leaks--no evidence of any leakage. Anyone have any suggestions or advice?

Thanks in advance.

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old art

11-02-2006 16:20:23

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

had trouble on a chev. van put new brakes front and rear .they drove me nuts thought the drums were out of round the pedal would move up and down,in the end found the emergency brake cables were rusted and on some. to make sure i took the flat piece that works from the emergency brake lever to the outher shoe out and ran with out for a while my problem was gone put in both new cables every thing fine .

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Kevin (FL)

11-02-2006 05:40:57

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

Thanks to all for the good information. I'll check all items mentioned--especially the brake shoe size difference. That could be the problem, as I remember wondering about the size differences. And also the rubber line issue--I missed that one whe I was looking underneath.

For the question about bleeding, the front calipers were replaced with new ones and they had to be "filled" and bled. As a precaution, I also bled the rear line too. And when I changed the rear cylinders I had to fill/bleed them too.

As for the proportioning valve suggestion--considering the mileage, maybe it's not a bad idea to replace the thing anyway. Same question about the master cylinder, although we don't have unlimited funds, however we do need to get this issue fixed.

Thanks again for all your time. I haven't been able to post many answers as we're still tied up with hurricane relief/repairs here and with family in Mississippi.

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bradk

11-01-2006 18:35:42

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

You didn"t mention resurfacing the rear drums.
A definite must.You can get away with it on the fronts,but not the rears.
Also,like the other guys mentioned,short linings to the front.~brad

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Jdemaris

11-01-2006 15:32:24

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

From what you are describing - I had a similar thing happen to me with my 87 diesel Suburban - but it was the front. NAPA had come out with a new material in their "Premium" brake pads. I installed them, drove the thing around and it was fine. But - found out next morning - the brakes would lock up whenever I first started driving it. Even if I tried to gently feather them - they'd almost put me through the windshield. It had me going nuts - but in this case - it was the new material being tried out in pads and shoes and it was recalled. I went to PartsAmerica and told me to give me the cheapest, crappiest pads they sold - I installed them - and it's been fine ever since. It's funny you mentioned the collapesed brake-hoses. It happened on my 94 AWD Astrovan and really had me going for awhile. I didn't think it was possible for a rubber hose to get restricted internally - and lock up like that - but it did.

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glennster

11-01-2006 13:56:31

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

somethin else i just thought of, a lot of the drum brakes have a primary and secondary shoe, the primarygoes toward the front of the vehicle. the linings sit in different spots on the front and rear shoe set. check and see, if they are reversed, the drum will drag also

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glennster

11-01-2006 13:46:29

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

check the proportioning valve. it is located in the lines , follow the rear lines up to the front of the truck under the dash. there should be a block there with the lines splitting out. it may be sticking. you can do a quick check by applying the brakes, realeasing the pedal and then crack the rear bleeders to see if you have a pressure build up. if you do , its probably that valve. if you have 4 wheel antilock, it could be in the distribution pump. another thing to check, be sure all the rear harware is moving freely. it also could be the emergency brake cable is hanging up too.

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IH2444

11-01-2006 13:17:41

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

I also have to wonder why you had to bleed the brakes after a pad and shoe change ?

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IH2444

11-01-2006 13:16:29

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Kevin (FL), 11-01-2006 13:07:32

You have a piece of rubber line going from the body to the lines mounted on the rear axle.

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Jerry Cent. Mi.

11-01-2006 16:44:06

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Re: O.T. 1995 SUBURBAN BRAKES in reply to IH2444, 11-01-2006 13:16:29

I agree with the Primary and Sec. post. Ihappened to me. The linings adjust tighter when you go forward instead of when you backup.

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B-maniac

11-01-2006 17:13:21

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Re: O.T. 1995 SUBURBAN BRAKES in reply to Jerry Cent. Mi., 11-01-2006 16:44:06

I agree also. The shoe with the shortest lining goes to the front and the long lining to the rear. I do believe this would cause the grabbing.I assume it didn't grab before you did the job and really,what else did you change?? Like my Dad always said "check the simple things first" and he was usually right,it usually was something "simple".

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