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Old 08-16-2006, 12:22 PM
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GM right front disc clunks when apply

I have a 35 Ford with Heidt Mustang II front and mid 70's GM front disc. Often when I apply the brakes I hear a clunk in right front. I ran this setup before makeover and didn't have problem. Any ideas

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Old 08-16-2006, 01:03 PM
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Rubber bushing gone or missing on the pins. Brake pads moving around. Bad ball joint or wheel bearing...........
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Old 08-16-2006, 01:03 PM
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Pull the calipers and check the slider bushings. There are small o-rings that the bushings run in and these o-rings commonly wear out. An o-ring kit can be had at your local parts emporium for a few dinero...
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Old 08-17-2006, 01:05 AM
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If the ears on the outboard pads are not tightened down properly it can cause a clunk.
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Old 08-17-2006, 07:07 AM
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Thanks all. How do you tighten the ears on the outboard pads. It looks like the ears slide on the caliper.
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Old 08-18-2006, 01:57 AM
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Squeeze them down with Channel-lock pliers until the clearance from ear to caliper body is as close as you can get it. Spec is .005", I think, but I've never been able to get them quite that tight.
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Old 08-18-2006, 08:15 AM
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I'm confused. I'm using 70's GM mid size car calipers and pads. The ears that slide on the caliper are 1/8" steel Ain't no bending them down. Could they be too close to the caliper and hanging up when I hit the brakes? The pads are pretty fixed the way they go on the caliper piston. I think I'll check the 0 rings and to see if the pads slide easily on the caliper
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Old 08-18-2006, 08:27 AM
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I have had this problem in the past and it was because a bracket mounting bolt had loosened. Lock tite took care of the problem. Check all your bracket bolts as well as the caliper retainer bolts.

Trees
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Old 08-18-2006, 08:32 AM
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Thanks. I'm going to give everything the once over.
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Old 08-18-2006, 07:25 PM
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Quote:
Originally Posted by 1935 Ford Steve
I'm confused. I'm using 70's GM mid size car calipers and pads. The ears that slide on the caliper are 1/8" steel Ain't no bending them down. Could they be too close to the caliper and hanging up when I hit the brakes? The pads are pretty fixed the way they go on the caliper piston. I think I'll check the 0 rings and to see if the pads slide easily on the caliper
they are about 1/8" thick but only about 1//4" wide. They are very easy to squeeze with a set of channel lock pliers. You need to squeeze them down. You aren't done with the brake job till you do.
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Old 08-19-2006, 11:00 PM
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I did mine a couple of times before I heard anything about the ears needing to be bent. They worked fine, but they were noisy when you used them. As far as I can remember, it might have made more of a clacking noise than a clunk, but my memory is sometimes fuzzy.

I'm talking about the ones in figure 17, near the bottom of this article: http://ucx.com/documents/brakenoise....%20outboard%22

Last edited by jimfulco; 08-19-2006 at 11:05 PM.
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