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Re: 1990 spg brake question..... Posted by Ari [Email] ![]() ![]() In Reply to: 1990 spg brake question....., swedishfish, Thu, 13 May 2004 20:42:58 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Brakes squeak or squeal when they vibrate. There is an anti-rattle spring to help with this. It's possible that the spring has gotten loose. It's also possible that the pad material has gotten loose from the backing, or the spring holding the pad to the piston has broken. However, some pads do develop a squeak or squeal over time - it's just a phase they're going through. So if the pad thickness is OK, then it's nothing to worry about. Just a quick look-over for busted things would do. If everything is OK, and the squeak/squeal is annoying, then the solution is to pull the pads out and stick some anti-squeal goop on the back.
Under what conditions did the ABS & Brake Fluid lights come on? It is normal for them to come on when you first start the car after it has been sitting a while - the Brake Fluid light will go out, then the ABS shortly thereafter. That's the ABS system coming up to pressure (both lights on), and then the ABS running self-check.
If both lights come on while driving, that's a sign of low ABS pressure or a bad ABS accumulator. The low ABS pressure could be due to the ABS pump not coming on once, or you getting ahead of the pump. The ABS hydraulic pressure is used to provide power brake. That pressure is made by the ABS pump coming on, and is stored in the accumulator (black sphere on top of the master cylinder). Every time you hit the brakes, you use up some of that pressure. If it drops enough, the ABS pump comes on to restore it. If you do a lot of braking very quickly, you'll drop the pressure in the accumulator, and start using up pressure faster than the pump can supply it. That usually takes lots of hard braking in a very short time.
The other possibility is that the ABS accumulator has failed. Basically, you can't store much pressure. Here's a test - start the car and wait for the lights to go out. Wait for the buzz of the ABS pump to stop. Usually about a minute after starting. Now, pump the brakes, hard and fast. Count how many pumps before the ABS and Brake Fluid lights come on. In a normal system, it should be around 12-15. If the accumulator is shot, the lights will come on around 4 or 5, maybe sooner.
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