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Go Back   ClubCav.com: Chevy Cavalier Forums, Cavalier Forum Specific Technical Discussion Suspension, Brakes, Wheels, & Tires

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  #1  
Unread 10-18-2010, 01:18 AM
chevy_guy6809 chevy_guy6809 is offline
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Default Rear brake problems

I have a 96 cavalier ls, in the morning when i back out of the driveway my back brakes grab hard from hitting the brake pedal...go down the road and hit the brakes the back locks up sometimes to, but they always grab harder than they should because it always brings the backend down. Theres no brake fluid coming from the wheel cylinders, and i put new drums on because we thought they were out of round. I dont really know what else to do...any help? thanks
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  #2  
Unread 10-18-2010, 01:52 AM
Labman Labman is offline
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It sounds like the wheel cylinders are gunked up, possibly old, weak springs.

I would do a backing plate out brake job. It may be easier to rebuild the wheel cylinders than replace them. That can be done without removing them which can be a PITA. Note, kits are getting expensive and hard to find. When I did mine a few years ago, I bought cylinders and robbed the parts to reuse the old ones.

You can let the brake fluid wash out the grit from honing. Just be careful not to let the master cylinder run dry. Don't worry about pitting in the center, but our where cups ride does need to be good.
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  #3  
Unread 10-18-2010, 04:35 AM
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It sounds like your brake springs are old and weak . get a hardwear kit and install all the new springs and that should fix your problem .
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  #4  
Unread 10-27-2010, 02:41 PM
RDY RDY is offline
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My '96 does the same thing, but usually on cool/cold mornings, or humid/rainy days/nights. And always after it sits overnight. After a few brake applications, the problem is gone for the rest of the day, until overnight, to the next day.

The issue is with the brake material. I've pulled my wheels and checked the brakes about 7 times this spring/summer, and there are no issues with leaking wheel cylinders, bad park brake cables, or hardware. Brake shoe thickness is good.

I can't remember what "grade" of brake shoes I got from the last brake job 4 years ago. So I am guessing the issue is with the brake material used. Like I said, the issue is gone, once I apply the brakes a couple times. Then it is fine. And, it isn't a daily issue. Only happens on the conditions above.

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  #5  
Unread 11-10-2010, 02:20 AM
chevy_guy6809 chevy_guy6809 is offline
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a friend of mine said proportioning valve or something like that? could that be it? i have no idea what it is
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  #6  
Unread 11-10-2010, 03:38 AM
missz2u missz2u is offline
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I know rust buildup will cause them to grab hard like that at first then wear off. My escort zx2 had that problem til i put aftermarkets on.
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  #7  
Unread 11-10-2010, 12:33 PM
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No cavaliers do not have a proportioning valve , they have a A.B.S system . your car is 14 years old now and how old are the brake springs on your rear brakes ? They do get weak and let the rear brakes come on to soon and they grab just like you say yours do . I don't know where you live and if there is a rusting problem there ?
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  #8  
Unread 11-10-2010, 09:09 PM
Labman Labman is offline
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Yes, old springs can be a problem. Wheel cylinders can stick even if they aren't leaking. If you change lining and fail to rebuild the wheel cylinders, one could start leaking and ruin the new brake lining.
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  #9  
Unread 11-15-2010, 01:21 AM
chevy_guy6809 chevy_guy6809 is offline
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i live in wisconsin and my cars definatly has rust....i wouldnt worry about it but i have to drive 40 miles one way to work in the snow, touching the brakes on a snowy highway wont end good so i need to get them fixed soon.....so what your saying is new hardware and wheel cylinders?
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  #10  
Unread 11-15-2010, 01:49 AM
Labman Labman is offline
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Yes, nothing lasts forever and cars are getting ever cheaper. Relining should always mean new springs, and the wheel cylinders need to be rebuilt or replaced every 5-10 years although I know those that say every time.

When I redid the back on my 02 a couple of years ago, I replaced all the hardware and rebuilt the cylinders. The only special tool you need to rebuild a cylinder is a cheap little hone, and maybe not that. To remove the cylinders you need a good Torx bit and socket and perhaps an impact wrench and a torch.
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