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Sound_Choice's avatar
Sound_Choice
Explorer
Aug 01, 2013

Master cylinder for 1974 Dodge Chasis class A

HELP...HELP...HELP!!! I have a 1974 Cobra Class A MH on a Dodge R-50 Chassis. It has what appears to be a cast-iron?? master cylinder with "air/vacuum"?? assist, that is leaking. All the parts people say the part is obsolete and no longer available...the Salvage yards look at me like I'm NUTS...and the local one of the local RV service dealers told me if I had it towed in they would probably tell me to tow it back out! Anybody got any help for an old guy with an old RV in the Kansas City Mo. area? TNX Kc
Class A

13 Replies

  • Sound_Choice's avatar
    Sound_Choice
    Explorer
    Aug 08, 2013
    I Was able to get it fixed, with all your help and the folks at United Tire Muffler and Service in Kansas City. Thank you one and all for your guidance.
    Kc
  • barnaclebill's avatar
    barnaclebill
    Explorer
    Aug 07, 2013
    Try Cardone, P/N 10-1576
    Dodge Trucks B300 Van 1977-1977

    Application Data:



    Dodge Trucks M300 1973-1973

    Application Data:

    w/Disc Brakes


    Dodge Trucks M300 1977-1974

    Application Data:

    w/Vacuum Booster


    Dodge Trucks M350 1974-1974

    Application Data:



    Dodge Trucks M375 1973-1973

    Application Data:

    Disc


    Dodge Trucks R300 1974-1974

    Application Data:



    Plymouth Trucks PB300 Van 1977-1977
  • barnaclebill's avatar
    barnaclebill
    Explorer
    Aug 07, 2013
    Dodge chassis were M300 M400 or M500 the "van Cutoffs" were MB300 or MB400. Try a master cylinder for a 1974 Dodge D300 (1 ton pick-up) I think they are the same? I hope this helps, Bill
  • Roman_Duck's avatar
    Roman_Duck
    Explorer
    Aug 07, 2013
    It sounds like your master cylinder is leaking, you mentioned fluid leaking out the back of it. That normally would be dry rotted seals on the plunger. On the body/ housing of the cylinder there will be a casting number stamp/cast into the housing. Take that number to your local napa dealer, they should be able to cross refrence it.
    Another supplier you might want to check is Fleet Pride, they're a big truck parts supplier,
    Good luck, you never fail, until you stop trying
  • wallynm's avatar
    wallynm
    Explorer
    Aug 04, 2013
    dodge trucks

    Join and post there or here

    Travco

    Sound Choice wrote:
    HELP...HELP...HELP!!! I have a 1974 Cobra Class A MH on a Dodge R-50 Chassis. It has what appears to be a cast-iron?? master cylinder with "air/vacuum"?? assist, that is leaking. All the parts people say the part is obsolete and no longer available...the Salvage yards look at me like I'm NUTS...and the local one of the local RV service dealers told me if I had it towed in they would probably tell me to tow it back out! Anybody got any help for an old guy with an old RV in the Kansas City Mo. area? TNX Kc
  • Sound_Choice's avatar
    Sound_Choice
    Explorer
    Aug 04, 2013
    Thank you one and all for your assistance. Still checking out your suggestions. Talked w/Colaws...they had nothing...talked with Vanderhaags, they referred me on. My problem is not only big fluid loss at back of master cylinder...but also excessive pedal pressure. I hhope it is not the booster pump because I know absolutely nothing about that. Any more ideas are always welcomed. TNX again, Kc
  • MrWizard's avatar
    MrWizard
    Moderator
    Aug 03, 2013
    what is bad?
    the master cylinder., or the vacuum booster

    do the brakes work, but needs a lot of pedal pressure
    or no brakes

    the parts separate, the master cylinder can be replaced or rebuilt

    finding another vacuum booster , check with dodge truck parts suppliers and brake part rebuilders

    also check colaws? the RV salvage yard in Missouri

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