67 RS Rear Brakes Squeaking - Team Camaro Tech
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post #1 of 15 (permalink) Old Aug 20th, 17, 10:45 AM Thread Starter
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Jonathan
 
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67 RS Rear Brakes Squeaking

I just started hearing my rear brakes squeaking when I slow down. When in reverse no squeaking. Then as I pulled into the garage I believe the brakes where slightly engaged as I could fee the drag on the motor. I believe the adjuster or cylinder isn't retracting. I have all new parts from the master cylinder to the drums. Lines, hoses you name it. I took the drums off this morning and cleaned everything with brake cleaner and drove for a little bit and it started again. Thoughts?
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post #2 of 15 (permalink) Old Aug 20th, 17, 01:36 PM
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George
 
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Re: 67 RS Rear Brakes Squeaking

First thought would be to check MC push rod length, if the brakes are indeed dragging. If that's not what's happening then I would suspect the shoes are actually moving on their resting points on the backing plates - did you apply any lube to these points during assembly? JMThoughts -others will chime in I'm sure.
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post #3 of 15 (permalink) Old Aug 20th, 17, 03:20 PM Thread Starter
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Jonathan
 
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I have not applied any lube. I was just reading about that. I've never had to apply lube to drum brakes before, where the metal contacts are. Hopefully that's the fix. Nothing like driving down the road and getting all those looks and thumbs up, then squeaking to a stop like a school bus...
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post #4 of 15 (permalink) Old Aug 20th, 17, 04:31 PM
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Al
 
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Re: 67 RS Rear Brakes Squeaking

If you are hearing the squeal while the car is rolling it would not be due to backing plate lube. You would hear that as the brakes are applied and released. The squeal you are describing would be the shoes against the drums. Chances are the drums and shoes are glazed over. You don't need to use brake cleaner to remove brake dust. If there is an oily residue you have a grease seal or wheel cylinder leaking. Use a piece of sand paper on the shoes and drums to brake the glaze if evident. There are some shoe compounds that are notorious for glazing even under normal conditions. Double check the shoe adjustment and the master cylinder push rod as suggested.

Al

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post #5 of 15 (permalink) Old Aug 20th, 17, 05:36 PM Thread Starter
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Jonathan
 
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It squeaks only when driving and applying the brakes. After I adjusted the brakes this morning the binding described went away. the squeking stopped for a couple miles but is back when applying the brakes.
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post #6 of 15 (permalink) Old Aug 26th, 17, 05:41 AM Thread Starter
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Jonathan
 
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I need someone to help me clarify as I'm getting conflicting information. Does the long shoe go in the front or the back facing? On the rear brakes I have the long shoe facing the rear. On the front the long shoe is on the front and short facing the rear. I put them on in the same manner as the old ones. Does it matter? Maybe this is where my squeking is coming from.
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post #7 of 15 (permalink) Old Aug 26th, 17, 06:07 AM Thread Starter
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Jonathan
 
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I switched the shoes so the long one (left in picture) faces the rear. Does this look right?
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post #8 of 15 (permalink) Old Aug 26th, 17, 06:45 AM
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Michael
 
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Re: 67 RS Rear Brakes Squeaking

Yes, I believe the longer shoe goes towards the rear. Here is an older thread on the topic:
https://www.camaros.net/forums/16-bra...are-setup.html


Mike

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post #9 of 15 (permalink) Old Aug 26th, 17, 09:18 AM
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George
 
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Re: 67 RS Rear Brakes Squeaking

X2 long shoe towards rear of vehicle.
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post #10 of 15 (permalink) Old Aug 26th, 17, 04:57 PM Thread Starter
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I lubed the metal contact points and made sure the shoes where on correct. The squeking returns after about 10 minutes of driving. The first 3 months of driving it didn't have this problem. Think it could be the shoes?
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post #11 of 15 (permalink) Old Aug 26th, 17, 05:15 PM Thread Starter
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Jonathan
 
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The new shoes are Bendix part number 242.
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post #12 of 15 (permalink) Old Aug 27th, 17, 09:13 AM
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Al
 
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Re: 67 RS Rear Brakes Squeaking

Did you scuff the shoes and drums with sandpaper ? If
not give it a try. Use a cross hatch pattern. If the squeal
returns replace the shoes with riveted shoes from
Wagner or Raybestos. I am assuming you either
installed new brake drums or had the originals turned.

Al

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post #13 of 15 (permalink) Old Aug 27th, 17, 04:00 PM Thread Starter
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Jonathan
 
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Yes new drums and shoes. I did scuff them up. I'm ordered some Power Stop Auto Specialty from Summit Racing. I'm hoping that will take care of it.
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post #14 of 15 (permalink) Old Sep 1st, 17, 03:17 PM Thread Starter
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Jonathan
 
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Re: 67 RS Rear Brakes Squeaking

So the issue was the shoes. I installed the Power Stop shoes and all is quiet. One interesting thing about the old Bendix (new) ones was the shoe had shiny spots like glazing. Even after sanding them down, after 5 minutes of driving/braking the glaze would return.
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post #15 of 15 (permalink) Old Sep 1st, 17, 04:29 PM
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Al
 
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Re: 67 RS Rear Brakes Squeaking

Hopefully the problem is cured for quite some time but
you didn't have a problem for the first 3 months with the
Bendix shoes. The glazing normally comes from the arc
of the shoes not matching the arc of the drum. This can
also create hard spots on the drums. All of this causes
a smaller than designed portion of the shoes to provide
the stopping power and additional heat on those
contact areas. The cure use to be to grind the shoes
on an arc to match the drum diameter. Finding a shop
to do it is a challenge these days due to rules
governing the dust it creates. Glad you got it fixed.

Al

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