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 Post subject: Cleaning brake shoes
PostPosted: Fri Aug 30, 2019 1:52 am 
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2 BBL ''SuperSix''

Joined: Mon Dec 17, 2018 1:38 am
Posts: 23
Car Model*: '67 Plymouth Fury I
I have a rear drum brake that is leaking fluid. So I'm gonna replace the brake cylinder.

However, the brake shoes might be contaminated. I have a pair of Raybestos 337RP (11 x 2.75) shoes. They were installed by the previous owner.

Now my question is: can these particular brake shoes be cleaned with brake cleaner to remove any braking fluid? As I understand, the older brake shoes cannot, but what's the case for these more modern materials?


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 Post subject: Re: Cleaning brake shoes
PostPosted: Fri Aug 30, 2019 3:30 am 
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SL6 Racer & Moderator
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Joined: Sat Oct 19, 2002 12:06 pm
Posts: 7262
Location: Silver Springs, Fl.
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I really don't know the answer. However my recomendation is to replace BOTH wheel cylinders, and both shoes. Parts are not expensive, and why take a chance.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
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 Post subject: Re: Cleaning brake shoes
PostPosted: Fri Aug 30, 2019 3:39 am 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6117
Location: So California
Car Model*: 64 Plymouth Valiant
I've done this for rear shoes (not front, as most of your braking is up front)

A pot of boiling water with a little bit of dish washing soap...……….

Brake fluid is miscible with water so it tends to come out of the pores...……

The hot water adds energy to speed things up. Not sure what the soap does. (maybe something to do with surface tension)

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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 Post subject: Re: Cleaning brake shoes
PostPosted: Fri Aug 30, 2019 4:24 am 
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Supercharged
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Joined: Sat Nov 27, 2004 8:03 pm
Posts: 5126
Location: IRWIN PA
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Check to make sure the fluid is from the wheel cylinder, and not the axle seal.

Additionally,

I have used parts washer to clean shoes ( mineral spirits in a pan or bucket can work if you don't have a parts washer.

Rinse and dry it off thoroughly with hot water and then dry completely.

spray brake cleaners work well too!

I have never had a problem with either of those techniques.


Greg

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Greg Ondayko
69 Dart http://www.youtube.com/hyperpack
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 Post subject: Re: Cleaning brake shoes
PostPosted: Fri Aug 30, 2019 10:57 am 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7265
Location: SW Washington
Car Model*: 1954 Dodge C1-B8
I do not clean brake shoes that have become contaminated because the contamination always penetrates the porous brake lining and will not come out. When the shoe gets hot the contaminants vaporize and come out of the shoe. But the gasses can't come out of the shoe where it's in contact with the drum and the vapors will cause the shoe to lose contact with the drum surface. This is brake fade. If you never use the brakes hard enough to get them hot you'd probably never have this happen, but I don't take such a chance. I want everything the brakes will deliver. If I were truly poverty stricken and had to reuse the shoes I would clean them, but that's not my situation.

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 Post subject: Re: Cleaning brake shoes
PostPosted: Sat Aug 31, 2019 2:01 pm 
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Turbo Slant 6

Joined: Wed Jun 13, 2012 4:39 am
Posts: 520
Location: Australia
Car Model*:
Back in the day when these brakes were as good as it got common practice would have been to replace the leaking wheel cylinder and simply wash the linings with water and call it a job . These days if the linings were really saturated with brake fluid I’d see how they cleaned up by washing and brake cleaner. One thing I have seen with really contaminated linings is the bonding fails and the lining starts to seperate . This was years ago now, so I’m sure modern Bonding agents may be more or less prone to this, but worth considering in your diagnosis.


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 Post subject: Re: Cleaning brake shoes
PostPosted: Wed Sep 04, 2019 10:13 am 
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2 BBL ''SuperSix''

Joined: Mon Dec 17, 2018 1:38 am
Posts: 23
Car Model*: '67 Plymouth Fury I
Greg Ondayko wrote:
Check to make sure the fluid is from the wheel cylinder, and not the axle seal.

Additionally,

I have used parts washer to clean shoes ( mineral spirits in a pan or bucket can work if you don't have a parts washer.

Rinse and dry it off thoroughly with hot water and then dry completely.

spray brake cleaners work well too!

I have never had a problem with either of those techniques.


Greg


Just removed the drum to have a closer look. There was no brake fluid ... well, I could not see any since everything was covered with grease .... Like you suggested Greg: is this the result of a broken axle seal?


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 Post subject: Re: Cleaning brake shoes
PostPosted: Wed Sep 04, 2019 3:57 pm 
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Supercharged
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Joined: Sat Nov 27, 2004 8:03 pm
Posts: 5126
Location: IRWIN PA
Car Model*:
Probably right. Gear oil leaking past the seal.

Greg

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69 Dart http://www.youtube.com/hyperpack
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