old brakes dont work the greatest

Discussion in 'Suspension, Steering, Brake & Wheel Topics' started by Mwilson, Feb 26, 2018.

  1. Mwilson

    Mwilson Veteran Member

    Im switching to 4 wheel disc I found a good deal on a kit on ebay lol anyway is there any reason I need to change master cylinder or proportioning valve?
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    Nov 4, 2004
    Ringgold, GA
    You'll need a disc/disc proportioning valve, master cylinder is okay.
  3. Mwilson

    Mwilson Veteran Member

    going ahead with the install Saturday fingers crossed!! lol is a "Summit Racing" kit
  4. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

    Mar 27, 2016
    You may want to get the manual adjustable one, to set up the front rear, more to your liking
  5. Zspoiler

    Zspoiler Veteran Member

    May 6, 2012
    Federal Way, Washington
    Use a proportioning and master cylinder from a 1979-81 Firebird /Trans Am,
  6. Mwilson

    Mwilson Veteran Member

    I bought an OE disc/disc proportioning valve I dont want another thing to adjust! lol
  7. Skip Fix

    Skip Fix Veteran Member

    Mar 21, 2007
    But depending on different tire sizes, different front or rear spring rates you will need some adjustment as the factory ones are designed with the bias for the complete factory system.
  8. ULTM8Z

    ULTM8Z Veteran Member

    May 19, 2000
    Los Angeles
    You need to size the master cyl piston to the caliper pistons or you'll have a pedal that's too hard or too soft.

    As far as prop valve, I used a late 70's WS6 Firebird 4-wheel disc and it works great.

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