View topic - front brakes 1961 Desoto locking up when coming to a stop

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PostPosted: Thu Mar 16, 2017 8:50 pm 
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Joined: Mon Feb 27, 2017 4:13 pm
Posts: 4
Front passenger side brake shoes lockup when coming to a stop. The following has been done to the brake system.
Power assist unit rebuilt
New master cylinder
All new cylinders
New drums in rear
New shoes in front
Had all 4 drums turned

Any suggestions?? I'm a new club member my name is Lou.


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PostPosted: Thu Mar 16, 2017 9:19 pm 
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Joined: Fri Jan 30, 2015 10:57 pm
Posts: 219
Make sure your lines are bled properly and your brake shoes are adjusted properly. Otherwise you may have a wheel cylinder leaking coupled with moisture on the linings. This creates lock-up big time.

I'm only going from my experience and others might have different ideas.

"It's delightful, it's delovely, it's DeSoto"


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PostPosted: Sun Apr 30, 2017 2:59 am 
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Joined: Mon Jun 29, 2015 5:19 pm
Posts: 129
Location: Ann Arbor, MI United States
Hi Lou,

Did you ever get this condition resolved? Fred is absolutely correct when he says that adjustment is critical. There is a special service tool required to adjust those brakes, and if it isn't used when new shoes are installed, lockups will frequently be the result. This might be your problem.

_________________
Brent Jacobsen
Owner of a 1952 Desoto Firedome


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PostPosted: Wed May 10, 2017 1:32 am 
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Joined: Mon Aug 09, 2010 6:43 pm
Posts: 837
The attached may help. I'm not a '61 expert but I think the brake design is similar to the attached technical info.

Another tip I've seen work is to have the shoes ground to match the machined drums so you have full contact. Need a good brake shop with old machines to perform this work.

Mark


Attachments:
Center-Plane Brakes.pdf [910.34 KiB]
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PostPosted: Sun Jun 04, 2017 1:09 pm 
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Joined: Mon Feb 27, 2017 4:13 pm
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Never got the front brake problem resolved. Took them apart, checked the
The cylinders for leaks. Adjusted the brakes and will still lock up once I while
. Have not taken the brake shoes off yet to have them grind down.
Kind of frustrating situation..


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PostPosted: Mon Jun 05, 2017 12:51 am 
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Joined: Mon Jun 03, 2013 10:01 am
Posts: 221
Collapsed brake hose. Did you replace them when you did the brakes ?

Did you adjust the push rod on the brake pedal ? If so, the brakes may always be partially on, and may not release when you take your foot off the pedal. Never mess with that adjustment.

Ron


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PostPosted: Tue Jun 06, 2017 11:41 pm 
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Joined: Mon Feb 27, 2017 4:13 pm
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I replaced all the brake hoses and had the power booster rebuilt.
I don't if that push rod was adjusted at that time.


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PostPosted: Mon Aug 21, 2017 8:31 pm 
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Joined: Thu Aug 26, 2010 7:00 pm
Posts: 390
Lock-up is very common on center plane brakes, especially on cars that aren't driven regularly. The drums get a bit of surface rust and BOING, lock-up. You can turn the drums, but really just need to clean the rust off the inside with some sandpaper. Also, you could just expect lock up the first time or 2 you apply the brakes, so do it on your terms. Once the brakes scrape the drums a few times you should be good to go.


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