Mopar master cylinder 1970 maverick

Discussion in 'Drag Racing' started by 74Comet347, Apr 10, 2023.

  1. 74Comet347

    74Comet347 Member

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    I just did the front disc swap on my 70 maverick, rear drums, Im also doing the Biondo line lock, my question is do I need to replaced the brake proportioning valve?
    Car was all 4 drums before. Looking for ideas. Thanks
     

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  2. bmcdaniel

    bmcdaniel Senile Member

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    It depends. The prop valve keeps the rear wheels from locking up before the fronts. With stock or near stock rear wheels/tires lockup could be a problem when changing to disc/drum setup. With bigger, heavier rear tires and wheels they often have enough inertia to keep from locking up and a prop valve isn't needed. I changed to discs in the front, too. In my car with 15X8 wheels and 255 60 15 tires on the rear it's not a problem. When I had smaller wheels and tires on the rear I would sometimes notice the rear braking harder than the front.
     
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  3. 71gold

    71gold Frank Cooper Supporting Member

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    the race shop that
    did the specs on my disc/disc setup said no prop valve was need as Barry said. they said the larger rear tires would be the bias for the system...:drive:...:chirp:
     
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