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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » May have an answer why my brake pedal is soft and goes wayyy down!!

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    1/22/2019 5:45 PM  #1

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,874

    May have an answer why my brake pedal is soft and goes wayyy down!!

    Since I used the Scare Bird Conversion....it uses a "shivel-lay" caliper. THAT!! is why the Maverick MC gave  just so-so results. The "shivel-lay calipers  retract more than the FoMoCo ones (so they won't drag)
    Therefore....a "stepped" MC is required to make them work correctly. OR so this fellow hot rodder sez.
    S-10 MC is stepped. I THINK.....the calipers take more fluid to go out/extend and a stepped MC makes'em do right.
    I'm gonna try it and let y'all know. (Not that anybody else has this set-up)
    6sally6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    1/22/2019 7:16 PM  #2

    rpm
    Senior 24-7 FYI Addict

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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,673

    Re: May have an answer why my brake pedal is soft and goes wayyy down!!

    Keep the master cylinder, trash the calipers 

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    1/22/2019 8:28 PM  #3

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,299

    Re: May have an answer why my brake pedal is soft and goes wayyy down!!

    I think a 4.3L Chevy V6 will bolt right in there also.  Just to match your calipers.

    Maybe a 2 psi residual pressure valve in the line would help.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    1/24/2019 6:34 PM  #4

    RV6
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    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,250

    Re: May have an answer why my brake pedal is soft and goes wayyy down!!

    rpm wrote:

    Keep the master cylinder, trash the calipers

    Follow RPM's advise!
     

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    1/24/2019 7:35 PM  #5

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,874

    Re: May have an answer why my brake pedal is soft and goes wayyy down!!

    Guess I could just switch calipers.....................except the brackets were designed for the shivel-lay calipers!!
    I wonder if I took a-hold of some war..........(Thax BB)??????
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
       •Thread Starter
     

    1/25/2019 10:10 AM  #6

    GPatrick
    Senior 24-7 FYI Addict

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    Registered: 4/01/2013
    Posts: 1,117

    Re: May have an answer why my brake pedal is soft and goes wayyy down!!

    Or you can follow the advice from MS above and install a residual pressure valve.  2 psi should do the trick.  If these are the fronts, loose wheel bearings can also produce excessive disc movement that can cause caliper pistons to retract more than normal.  And, if the calipers are not properly centered over the disc it can put a side load on the rotor when the brakes are applied and then it springs back when the brakes are released causing the pistons to retract.  The centering issue can also affect rear discs.  Pull a wheel and have someone mash the pedal while you watch the caliper so see if there is excessive movement.  Shims are supplied with some bracket kits to aid in centering the caliper.

    https://www.summitracing.com/parts/wil-260-13783/overview/

     

     

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  •  »  May have an answer why my brake pedal is soft and goes wayyy down!!

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