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57 Desoto Bellow Brake Booster Help
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dm69charger
Posted 2018-02-01 7:42 AM (#557318)
Subject: 57 Desoto Bellow Brake Booster Help


Member

Posts: 7

Good Morning Desoto Family!! Can anyone help me put my Bellow Brake Booster back together properly? Last year I took apart the bellow brake booster on our 1957 Desoto Adventurer Convertible so I could clean it up and paint it. There was nothing wrong with it other than it needed cleaned up. Anyway, I thought the book I have showed how to put it back together. It does not. It only shows how to re-assemble the canister type and not the bellow type. I put the brake booster back together the best I could figure out but something is not right? When I start the car the brake booster is already activated with vacuum? I have to have something installed wrong. If anybody has an instruction manual on how to re-assemble one of these, I would greatly appreciate it.

Thankx,

-Don
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ronbo97
Posted 2018-02-01 10:47 AM (#557327 - in reply to #557318)
Subject: RE: 57 Desoto Bellow Brake Booster Help


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Posts: 4034
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Location: Connecticut

There is a 'finger' on the power brake pedal that depresses the small plastic button at the rear of the booster. The finger probably got misaligned when you removed the booster.
Here's some good reading on 58 power brakes. Pages 21-22 talks about what I just described:  http://imperialclub.com/Repair/Lit/Master/125/index.htm

Ron

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dm69charger
Posted 2018-02-01 2:29 PM (#557332 - in reply to #557318)
Subject: RE: 57 Desoto Bellow Brake Booster Help


Member

Posts: 7

Very interesting read. Thank you for the link. I think it is more than that? As soon as I start the car the vacuum activates the bellow and compresses it. There is something I did wrong in the re-build. The bellow should not be activated from the vacuum of the engine until after I step on the brake pedal. I know that is not right. Again, if someone has an instruction manual or can very carefully take one apart to show me how the pieces go back in the correct way, I would greatly appreciate it!! Please nobody go out of their way to take one apart. If you are thinking about it or have to that would be awesome!! I know that the rubber bellows themselves go bad and they have replacement kits for them.

Thankx,

-Don
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ronbo97
Posted 2018-02-01 7:25 PM (#557350 - in reply to #557332)
Subject: RE: 57 Desoto Bellow Brake Booster Help


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Posts: 4034
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Location: Connecticut

There's an exploded view of the unit in the 55-58 parts book. Also the shop manual has some detail of the inside of the assembly.

Ron

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56D500boy
Posted 2018-02-01 7:49 PM (#557352 - in reply to #557350)
Subject: RE: 57 Desoto Bellow Brake Booster Help



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ronbo97 - 2018-02-01 7:25 PM

There's an exploded view of the unit in the 55-58 parts book. Also the shop manual has some detail of the inside of the assembly.

Ron



Agree. One of these three diagrams should help dm69charger.

Edited by 56D500boy 2018-02-02 12:51 AM




(PowerBrakePowerUnitDesign_0.jpg)



(PowerBrakePowerUnitDesign_1.jpg)



(PowerBrakePowerUnitDesign_2.jpg)



Attachments
----------------
Attachments PowerBrakePowerUnitDesign_0.jpg (171KB - 145 downloads)
Attachments PowerBrakePowerUnitDesign_1.jpg (117KB - 158 downloads)
Attachments PowerBrakePowerUnitDesign_2.jpg (134KB - 151 downloads)
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dm69charger
Posted 2018-02-02 7:44 AM (#557374 - in reply to #557318)
Subject: RE: 57 Desoto Bellow Brake Booster Help


Member

Posts: 7

I knew you guys would have the answer!! You guys are the best!! That exploded view of the Bellow style brake booster is exactly what I need. I'll take her apart one more time and put her back together properly!! I need winter to be gone so that I can drive this thing!! Again, Thank You, Thank You, Thank You!!!!!

-Don
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