69 Front Disc Almost Non-Existent Pressure

Discussion in 'The whoa and the sway.' started by brianfxt, Nov 13, 2018.

Page 2 of 2
  1. telriv

    telriv Founders Club Member

    The hold off valve & proportioning valve are one in the same & both serve the same purpose of stopping the front disc brakes from applying before the rear brakes get 300 lbs. of pressure. That's the function of a hold-off/proportioning valve.
     
    telriv, Nov 18, 2018
    #21
  2. brianfxt

    brianfxt Active Member

    I've yet to try them without any vacuum assist. Honestly I was too chicken to test them out like that haha. I'll have to do it when the parking lot quiets down.
     
    brianfxt, Nov 18, 2018
    #22
    Electra man likes this.
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Not according to my EIS Brake manual Tom. The Hold off valve and Proportioning valve had two different functions. From everything I have read though, the earlier cars just used a Hold Off Valve, not a proportioning valve. 71 and later used a combination valve with separate hold off and proportioning sections.

    EIS1.jpg EIS2.jpg CombinationValve1971.JPG
     
    LARRY70GS, Nov 18, 2018
    #23
  4. gstewart

    gstewart Well-Known Member

    I depressed the hold-off valve & it would not release, no matter what. had to buy a new one, back in 2001.
     
    gstewart, Nov 19, 2018
    #24
Page 2 of 2

Share This Page