1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Brake Cluncking

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Old Mar 11, 2002 | 07:24 PM
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Question Brake Cluncking

Hey all, my friend has a first gen (dont know what year or model tho) and he was telling me today that when he pushing on the brakes without the assist of gearing down, the breaks make a cluncking noise. He says that its coming from one of the front brakes and described it as a metal on metal noise.
My first thought was a piston in the brakes or a caliper or something.
Anyone have any idea what Im talking about? or what this problem might be?

We are going to a RX-7 meet this saturday and he doesnt want to drive it there unless the clunckin is no more.

Thanks all!
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Old Mar 12, 2002 | 12:54 AM
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if its just a clunk it might be the little clip that holds the breakpad into place that has fallen off or has not been properly installed,this would cause a similar clunking sound.
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Old Mar 12, 2002 | 01:00 AM
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or the caliper bolts or some other bolt could be loose. I lost a rear caliper bolt the other day with what could have been disasterous results. upon applying the brake the caliper rotated up and came in contact with the wheel and locked it up.

so get it looked at pretty soon. It could be that dangerous or it could just be a worn bushing somewhere.
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Old Mar 12, 2002 | 05:41 AM
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That happened to me once, I thought it sounded like it was coming from the front brakes, but it was actually the rear shoes which had completely worn out - metal on metal.
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Old Mar 13, 2002 | 09:57 PM
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From: Behind a workbench, repairing FC Electronics.
Have the brakes been worked on recently? The most common cause of noise is improper lubrication.

Dismantle the brakes, take the pads out, take the caliper slide pins/bolts out. Clean all the brake dust off and clean any grease off.

If the caliper slide bolts are rusted, it's a good idea to replace them, but if new bolts are unavailable, use a wire wheel on a bench grinder to clean the rust off. Make sure the suraface is smooth.

Shoot a little WD-40 onto the caliper slide bolts and in the holes that the caliper slide bolts go into. Also check the condition of the dust boots for the slides. Clean out all the old grease and dirt. Add some anti seize or moly grease to the slide pins and slide holes.

Add the same grease to the area on the caliper bracket where the pads sit.

DO NOT GET ANY GREASE OR LUBRICANT ON THE PAD SURFACE OR THE BRAKE DISK SURFACE!!!!!

Reassemble the brakes.

That should do ya.

If the brakes were worked on recently, you amy want to check for phonographing. This is caused by improper turning of the rotors. The grinding bit actually creates a spiral in the rotors and the pads try to thread onto the rotor. Remove this with sand paper.

Double check your rear brakes as well.
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Old Mar 13, 2002 | 10:52 PM
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Hey thanks guy! Ill give it a go and see what happens.
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