Brake problem - not E-body, - but we got some clever guys in here..

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    Author Topic: Brake problem - not E-body, - but we got some clever guys in here..  (Read 3243 times)

    Offline cowboy

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    Brake problem - not E-body, - but we got some clever guys in here..
    « on: March 19, 2010 - 08:59:20 AM »
    What’s wrong with my 57 DeSoto...??

    I tryed to get the air out of the brakes,
     - I can get the pedal down 3 – 4 times, and get the fluid out of the airscrew on the wheels, but after 3-4 times the pedal is stocked in top, and can’t be preesed down anymore, and all wheels turn freely when pressing the pedal -
    If I then try again the next day, - it will take 3-4 pumps, and then it’s stocked again.???

    Any sugestions..???
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    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.



    Offline Supercuda

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #1 on: March 19, 2010 - 09:47:26 AM »
    It sounds like you have seized wheel cylinder pistons. Has the car been sitting for a while? This can result in rust formation in the w/c bores, and consequent seizing of the piston to the bore. This will often result in the symptoms you describe. If this is the case, it is time to hone and rebuild, or replace them. If the car has been running and driving up to now, some other questions need answering: Dos the brake pedal feel correct after bleeding? Does the brake seem to work at the wheel when it is soft? Are all 4 positions experiencing this "no action" complaint?
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    Offline cowboy

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #2 on: March 19, 2010 - 10:08:39 AM »
    Got it..  :bigsmile:

    This little piece of rubber brakehose rigth under the master cyl. is tigth, no pass true  - do it have any function..???
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    MoPar's for Cruizin, Racing & Pro-touring: www.CowboyCars.dk

    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.

    Offline Bullitt-

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #3 on: March 19, 2010 - 10:43:53 AM »
    Just Guessing its a residual valve.  :dunno:
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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    Offline cowboy

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #4 on: March 19, 2010 - 10:54:56 AM »
    residual valve..???
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    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.

    Offline GoodysGotaCuda

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #5 on: March 19, 2010 - 11:00:28 AM »
    Quote from: cowboy on March 19, 2010 - 10:54:56 AM
    residual valve..???

    Keeps slight pressure on drum systems so they react quicker when you actually hit the brakes. Apparently helps with the wheel cylinder seals as well.
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    Offline cowboy

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #6 on: March 19, 2010 - 12:21:55 PM »
    -
    Do I "need" it, - and do I have something like that on the Challenger..???
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    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.

    Offline Bullitt-

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #7 on: March 19, 2010 - 03:20:04 PM »
    Only used on Drum brakes...I don't think it has anything to do with performance but if your drum cylinders leak without it you'll know why... Sold now days for Hotrods that have the Master Cylinder below the level of the brake cylinders to prevent bleed back.

       Early 70's would of had them for the drums inserted in the MC just behind the inverted flair where the brake lines screw in. By '73 the wheel cylinders had been redesigned not to need them & from what I understand replacements for the prior models have the newer design so they are no longer necessary.
    « Last Edit: March 19, 2010 - 03:54:00 PM by Bullitt- »
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
    Screwed by Photobucket!

    Offline cowboy

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #8 on: March 19, 2010 - 04:19:10 PM »
    -
    What you say is,--I have to have it,  can't replace it with a piece of brakeline.. :clueless:
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    MoPar's for Cruizin, Racing & Pro-touring: www.CowboyCars.dk

    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.

    Offline Bullitt-

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #9 on: March 19, 2010 - 04:28:31 PM »
    Quote from: cowboy on March 19, 2010 - 04:19:10 PM
    -
    What you say is,--I have to have it,  can't replace it with a piece of brakeline.. :clueless:

    Yes...Unless you have the newer replacement wheel cylinders.
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
    Screwed by Photobucket!

    Offline cowboy

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #10 on: March 20, 2010 - 06:01:44 AM »
    -
    I see it at NAPA, - but they don't say anything of backpressure valve inside..???

    Brake Hose - Front 
    Product Line:   NAPA ULTRA PREMIUM BRAKE PARTS 
     
    Part Number:   UP 27048 
     
    Price:   Price
    Unit
      :
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     22.99
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    Features & Benefits   Engineered To Meet Or Exceed O.E. Design & Quality.; Dryrot Resistant Rubber Compounds & Corrosion Resistant End Fittings Ensure Reliability.; Copper Washers (Where Necessary) & Properly Threaded End Fittings Provide Leak Free Connections.; Meets Federal Safety Standards. 
     
    Warranty   Limited Lifetime-See Manufacturers Written Policy
    Warranty PDF
     
     
    Attributes   Brake Hose End Type : 7/16" - 24 & 7/16" - 24.
    Brake Hose Length : 5.625"
    Caution Statement : Do Not Use w/ Petroleum-Based Fluids - Designed Only For Use w/ DOT Approved Silicone- Or Glycol-Based Brake Fluids.
     
     
    Material Safety Data Sheet   There is no MSDS for this item 
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    MoPar's for Cruizin, Racing & Pro-touring: www.CowboyCars.dk

    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.

    Offline Bullitt-

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #11 on: March 20, 2010 - 09:02:46 AM »
    Quote from: Bullitt- on March 19, 2010 - 10:43:53 AM
    Just Guessing its a residual valve.  :dunno:
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
    Screwed by Photobucket!

    Offline UKcuda

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #12 on: March 22, 2010 - 04:50:30 AM »
    Does your Desoto have a separate frame?

    If so it could be this flexi pipe is there to allow movement between the master cylinder (body mounted) and the brake line (frame mounted) ?

    If that is what it does then you can do without it by putting a couple of coil turns in the pipe as it comes off the cylinder which will allow some flexibility - you'll see the same thing for the same reason on '70s GM products.
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    Offline cowboy

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #13 on: March 22, 2010 - 06:25:49 AM »
    -
    Quote from: UKcuda on March 22, 2010 - 04:50:30 AM
    Does your Desoto have a separate frame?

    If so it could be this flexi pipe is there to allow movement between the master cylinder (body mounted) and the brake line (frame mounted) ?

    If that is what it does then you can do without it by putting a couple of coil turns in the pipe as it comes off the cylinder which will allow some flexibility - you'll see the same thing for the same reason on '70s GM products.


    Thats what I'm gonna do, - the repop hoses dont have any residual valve in them anyway..
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    1930 Plymouth Hot Rod wannabe - 1957 DeSoto Fireflite Sportsman - 1967 RaceCuda  -  1968 Barracuda  -  1971 Challenger R/T Conv.

    Offline Aussie Challenger

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    Re: Brake problem - not E-body, - but we got some clever guys in here..
    « Reply #14 on: March 22, 2010 - 07:14:38 AM »
    Just saw this thread, yes it allows for frame/body flex, putting a couple of coils in the line can overcome but don't do it in copper as it hardens with usage and becomes brittle.   :2thumbs: make sure that the flares have double flares also.   :cheers:
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    Dave
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