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Old 06-21-2009, 02:59 PM
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scratching in 79 malibu front brakes

so i changed the break pads thinking it was gonna fix the noise of the passenger rear brakes, and it did but only one of the 2 noises. the one that fixed was the normal wearing out type of noise that the brakes make when its about that time again...but there is this scratching sound that the passenger rear brake continues to make. i noticed it made it before the new brake pads and also after the new installation. its as if it something is severely scratching when i slightly press the brakes, as if someone was scratching a chalk board. weird thing about it is that it makes the sound when i accelerate aswell, but not as severe. ANY suggestions/ideas? thanks....

Last edited by wiser626; 06-23-2009 at 04:10 PM.
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Old 06-21-2009, 03:12 PM
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Did you turn the drums when you replaced the brake shoes? If not, you should have. If they're originals, they're probably too worn to be turned, and you'll need new ones. They're cheap, at least.

Check the emergency brake linkage and adjustment. Also be sure the proper points have a light coating of lube on them, and that nothing is rusty or binding, and that all of the springs are in good shape- not deformed or rusted out.

Also see that the rear axle bearing isn't badly worn- this will allow the axle- thus the drum- to move around. Check to see that the backing plate is tight to the axle housing.\

Check that the brake adjusters are free to function as they should- they are supposed to take up "slack" each time you stop when backing up, in order to self-adjust the rear brakes.
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Old 06-21-2009, 05:12 PM
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CORRECTION!....sorry...i finally got someone to drive my car so that i can be outside and hear exactly where the noise was coming from. back brakes seem fine. its the front passenger side brake that makes the scratching noise. I havent changed the calipers to the front in nearly 2 years, are new ones a possibility?is it scratching the disc? any idea on what mite need to checked or replaced?...ps i dont have a jack right now, so i cant take the tire off unfortunately, will do 2morrow tho. thanks
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Old 06-21-2009, 06:46 PM
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Quote:
Originally Posted by wiser626
CORRECTION!....sorry...i finally got someone to drive my car so that i can be outside and hear exactly where the noise was coming from. back brakes seem fine. its the front passenger side brake that makes the scratching noise. I havent changed the calipers to the front in nearly 2 years, are new ones a possibility?is it scratching the disc? any idea on what mite need to checked or replaced?...ps i dont have a jack right now, so i cant take the tire off unfortunately, will do 2morrow tho. thanks
Sounds like you need to change the pads,and hope that you havent scratched the rotor up to bad if so you will need to replace them also. If they cant be turned, JMO. Cole
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Old 06-21-2009, 08:06 PM
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Quote:
Originally Posted by wiser626
CORRECTION
I love it.

When you get a jack, remove the tire. Take a look at the caliper- you (hope you) will see a little metal tab that's riveted to the brake pad, pry it back away from the rotor. It's a wear indicator that will squeal louder and louder till you do something about replacing the pads.

The next thing you will hear is either the other side doing the same thing or the same side doing it again- except THIS time, you will be eating up the rotor. That is, if it's not doing that already.
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Old 06-21-2009, 08:15 PM
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The wear indicator is letting you know that it is getting time to replace the pads. And you will need to do this before you hear the grinding of the rotor. The next time you hear it it may be to late. Cole
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Old 06-23-2009, 04:00 PM
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Quote:
Originally Posted by eloc431962
The wear indicator is letting you know that it is getting time to replace the pads. And you will need to do this before you hear the grinding of the rotor. The next time you hear it it may be to late. Cole
seems like it's too late. you guys were right. took the tire off and checked it out and the rotor seems to have grooves. i believe that the pads look fine but the rotors sure do have grooves. just yesterdays the noise was only heard when breaking, but now it can be heard without pressing the brakes at all. why would they do that? can they still be turned? thanks
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Old 06-23-2009, 06:57 PM
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It will probably be in your best interest to buy new ones. I know around here its very hard to find someone to turn them times have really changed. But if the groves are very deep buy new ones. Cole
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Old 06-23-2009, 08:09 PM
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Pasadena Tx or the 'other' Pasadena lol
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Old 06-23-2009, 09:11 PM
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Quote:
Originally Posted by wiser626
Just yesterday the noise was only heard when braking, but now it can be heard without pressing the brakes at all. Why would they do that? Can they still be turned?
The caliper piston isn't retracting far enough to keep the pad from touching the rotor. This could be because the caliper is over-extended and has become sticky, or possibly because the rotor is so grooved, the pad(s) will ride on the grooves as the wheel turns (the caliper basically "floats").

The calipers can be measured and compared to the "MIN" figure, usually cast into the rotor itself. The correct mike for measuring the rotor will have a pointed anvil to reach down to the bottom of the grooves. The one shown should have a deeper throat but has the anvil I was referring to.

If the wheel bearings are worn or out of adjustment, the same type of noise can be made. As can any bent or damaged parts like the backing plate, for instance.
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Old 06-23-2009, 10:34 PM
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thanks guys. i appreciate the knowledge and help. PASADENA, CALI
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Old 06-23-2009, 11:13 PM
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I was going to say to drop by the house with it and I would take a look at it but I'm in Texas so I guess not...
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Old 06-24-2009, 02:25 PM
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thanks a lot anyways!
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Old 06-24-2009, 03:58 PM
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Check to make sure the backing plate / splash guard is not touching the back of the rotor. This will also make a scrape type noise
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