1966 Mustang rear brake shoes not making full contact - Vintage Mustang Forums
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post #1 of 15 (permalink) Old 08-15-2019, 03:49 PM Thread Starter
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1966 Mustang rear brake shoes not making full contact

Help !! I just had my 1966 A code's brakes redone. New m/c, new w/c, shoes, drums, brake kits, the works. After the garage replaced everything, when testing, they found that the rear shoes are making minimal contact with the drums. They are suspecting that the rear w/c are the wrong ones. The build date on the door plate shows May 66, but the plate is a repro. We ordered the post-April 66 w/c.

Question: Could this be the problem? I don't think so. From what I've read, if they didn't match the old w/c, the threads would be wrong. Even so, could the wrong w/c cause this problem?

If not, what else could it be? I don't think it can be the w/c, because the parking brake no longer holds the car on a grade. No w/c involved in that process. Can it be that the shoes are too thin? Or the drums too big?

Grasping at straws here.
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post #2 of 15 (permalink) Old 08-15-2019, 04:15 PM
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Just a basic question. Are the self adjusters not spread as far as they will go? Anytime I do a brake job I always spread them out to where the drum just barely slides on.
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post #3 of 15 (permalink) Old 08-15-2019, 04:32 PM Thread Starter
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The garage guys say yes, but I'm going to have them show me. I tried reversing and stopping a number of times to get them to "self adjust" but it didn't do anything.
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post #4 of 15 (permalink) Old 08-15-2019, 05:27 PM
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Back in the day, when drum brakes ruled, a good shop would true the shoes to the drum. Not gonna happen in today's world.
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post #5 of 15 (permalink) Old 08-15-2019, 05:34 PM
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Take it to a garage that knows mechanics!
Corner tire store, big chains, startups do not have enough computers to fix a old Mustang. Most of them, the robotic arms are broken. Everyone is staring at the computer for next update.
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post #6 of 15 (permalink) Old 08-15-2019, 05:59 PM
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That's how the shoes are when new.They just need to be broken in which will take a few thousand miles
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post #7 of 15 (permalink) Old 08-15-2019, 06:52 PM
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Let's start here.... When you apply the parking brake does the handle come ALL THE WAY out to the end? That would be a good indication that the shoes aren't adjusted properly.

The other issues that could be in play are reversal of primary and secondary shoes and, yes, nobody knows anything about arcing rear brake shoes to match the radius of the drums. One more thing... many brake shoes have garbage for lining material. The parking brake should hold, but service brakes may require excessive pressure to properly apply.
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post #8 of 15 (permalink) Old 08-15-2019, 07:25 PM
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Quote:
Originally Posted by RV6 View Post
Back in the day, when drum brakes ruled, a good shop would true the shoes to the drum. Not gonna happen in today's world.
Well here in southern NH, we have a local non chain auto parts store, and YES they have a brake lathe to turn drums and rotors. I've bought several new rotors that not true, not uncommon, for ~ $15 they'll clean them up..

If you borrow a tool more than twice, you need to own it You get what you pay for!
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post #9 of 15 (permalink) Old 08-15-2019, 08:14 PM
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Back in the day a real auto parts store you purchased brake shoes and had the drums cut the shoes would be arced and placed in each drum.

A brake job done this way assured a firm pedal that stopped straight.

The shop I worked in the 80's we had a lathe that had the arcing machine on it and we would arc the shoes
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post #10 of 15 (permalink) Old 08-15-2019, 09:34 PM
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Quote:
Originally Posted by Grabber Blu View Post
Back in the day a real auto parts store you purchased brake shoes and had the drums cut the shoes would be arced and placed in each drum.

A brake job done this way assured a firm pedal that stopped straight.

The shop I worked in the 80's we had a lathe that had the arcing machine on it and we would arc the shoes

This ∆∆∆∆ before days of big impersonal chain shops the local independent shoes took the time to do the job right. They would cut the drums and the shoes would be arc ground to make full contact with the drum.

Tom

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post #11 of 15 (permalink) Old 08-15-2019, 11:41 PM
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I remember reading somewhere that "arcing" brake shoes has been outlawed by the EPA or OSHA due to the dust being declared HazMat. Maybe that was back when shoes actually had asbestos in the lining material.
Maybe somebody has more knowledge of this.
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post #12 of 15 (permalink) Old 08-16-2019, 06:55 AM
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" I tried reversing and stopping a number of times to get them to "self adjust" but it didn't do anything. "

It sounds like you didn't do it enough.. or you brought your self adjusters in way to far... That's why it's taking you longer to bring them all the way out..

)

Tony K.



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post #13 of 15 (permalink) Old 08-16-2019, 07:11 AM
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Make sure the adjusters are on the right wheel.


1965 Mustang Coupe 289/C4
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post #14 of 15 (permalink) Old 08-16-2019, 07:42 AM
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"Make sure the adjusters are on the right wheel. "

Great suggestion!

The RIGHT SIDE Adjusters are labeled "R" under the end caps and the LEFT SIDE Adjusters are labeled "L" under the end caps. They are not the same and NOT INTERCHANGEABLE either!

Make sure that each wheel has its correct side adjusters! A common mistake for people to make! Again, Thanks for that suggestion "bmcgc"...

)

Tony K.



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post #15 of 15 (permalink) Old 08-16-2019, 10:07 AM
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I have two old brake shoe 'resetting gauges' that you measure the I.D. of the drum with and lock it in place.
You then place the other end over the shoes and adjust them as close as possible before putting the drum on.
After that, the self-adjusters or brake spoon will complete the adjustment.
Here's a link to one: https://www.amazon.com/GEARWRENCH-33...SIN=B0002SQUJ0
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