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It stops itself!
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   Forward Look Technical Discussions -> Brakes, Wheels and TiresMessage format
 
MoreFin
Posted 2018-05-20 9:09 PM (#563722)
Subject: It stops itself!



Regular

Posts: 62
2525
Location: Minnesota
Finally after several attempts I got to drive my ’57 DeSoto following a 7-year restoration. About a mile from home I began to notice the brakes dragging about another ½ mile down the road I found a place to turn around and the brakes were nearly locked up. I shut off the car lifted the hood and pulled off the vacuum hose connected to the “Smooth Oval” style booster. I pumped the brakes a couple times and the pedal released it’s pressure and returned to a normal feel. I then returned home and by the time I was pulling back into the driveway the brakes were nearly locked up again.

Is there an adjustment on this brake booster or does it need to be rebuilt?

Is there something I missed in assembly?

Best place to have it rebuilt if needed?

As always guys, Thanks for the assistance it is greatly appreciated.

~Mark
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ttotired
Posted 2018-05-20 9:46 PM (#563725 - in reply to #563722)
Subject: Re: It stops itself!



Expert 5K+

Posts: 8242
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Location: Perth Australia
There is adjustments made under the dash.

Its in the service manual how to do it, but brakes grabbing seems to be a really common problem on these mopars

Look for contaminated brake linings, out of round drums, wheel bearings ect and make sure the brakes are adjusted properly as well

Use the search function on this page, many stories on locking brakes

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MoreFin
Posted 2018-05-20 10:15 PM (#563731 - in reply to #563722)
Subject: Re: It stops itself!



Regular

Posts: 62
2525
Location: Minnesota
Yes, I did a search and read my service manual long before posting.

The brakes function properly with the booster disconnected (just harder to push).

As soon as the booster is connected they apply themselves. There is little in the 1957 DeSoto Service manual to describe adjustments...

All other brake components(lines, wheel cylinders, shoes, springs and drums) are new and functioning properly, and fluid is super clean.
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ronbo97
Posted 2018-05-20 10:36 PM (#563732 - in reply to #563731)
Subject: Re: It stops itself!


Expert

Posts: 3163
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Location: Connecticut

It's likely a mis-adjusted 'finger on the power brake pedal. See page 22 of this Master Tech manual...

Master Tech 125 Brake Service

You should read this one cover to cover. Answers a lot of questions.

Ron



Edited by ronbo97 2018-05-20 10:38 PM
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MoreFin
Posted 2018-05-21 1:33 AM (#563740 - in reply to #563722)
Subject: Re: It stops itself!



Regular

Posts: 62
2525
Location: Minnesota
Thanks Ron!
That resource explained it far better than the Regular Service Manual.
I now know where the adjustment screw is and how it functions, not to mention the rest of the information I picked up reading this.
Thanks again, Mark
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Powerflite
Posted 2018-05-21 1:53 AM (#563741 - in reply to #563722)
Subject: Re: It stops itself!



Expert

Posts: 4541
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Location: So. California
Also, make sure you are not missing the long spring on the power brake pedal for that finger. If the spring isn't there, it will react similar to what you are experiencing.
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MoreFin
Posted 2018-05-22 1:11 PM (#563833 - in reply to #563722)
Subject: Re: It stops itself!



Regular

Posts: 62
2525
Location: Minnesota
Thanks for the heads up, in looking under the dash I believe I see the spring you mentioned although not entirely sure the "Nylon Button" on the end of the booster shaft is there... at a glance it looks steel. Do these fall off? If it is missing do doubt that may mess up my adjustments. Does someone reproduce these or am I better off making my own?

Although my brake saga may have to wait... I've now lost reverse gear, with the odometer reading 32,666... is it possible my car hates me, or is truly evil. Every time I think I am getting close to done, I slide further behind.

Thanks again guys for the assistance, Mark
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MoreFin
Posted 2018-08-02 12:57 AM (#567619 - in reply to #563722)
Subject: Re: It stops itself!



Regular

Posts: 62
2525
Location: Minnesota
Just a quick follow up. I got the transmission fixed and the old gal shifts like a new car now.

The brake fix was just as Ron suspected and with a little adjustment the the car stops as it should.
This is my first car with an adjustable brake booster, I guess you're never to old to learn something new...or learn something old.
Thanks Ron, and everyone else for taking the time to respond.

With just 500 miles on her so far, I am still chasing down those bugs that follow a complete restoration.

Best Regards, Mark


Edited by MoreFin 2018-08-02 1:49 AM




(57DeSotoRearThanks-2B.jpg)



Attachments
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Attachments 57DeSotoRearThanks-2B.jpg (249KB - 6 downloads)
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