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Thread: Bore size for rebuild on master cylinder

  1. #1

    Default Bore size for rebuild on master cylinder

    Can anyone tell me what the bore size is on an 89 coupe master cylinder?.. I am getting blow by to the rear reservoir. The numbers are - DHB- 39716. I believe that is a Dorman #

    Thank You
    Ken
    Last edited by ken mohr; 03-15-2019 at 12:19 PM.

  2. #2
    Join Date
    Dec 2011
    Posts
    152

    Default

    I couldn't find anything specific on a Corvette forum, but I found this information on another forum:
    '85-'87

    MC Bore .875"
    Wheel cylinder bore 2.1" front 1.6" rear
    Pedal arc ratio 3.5 to 1
    Line pressure with 100 lb on pedal 1250 front 800 rear

    '88-'91

    MC Bore .87"
    Wheel cylinder bore 1.5" (dual) front 1.6" rear
    Pedal arc ratio 3.5 to 1
    Line pressure with 100 lb on pedal 1250 front 750 rear

    '92-'96

    MC Bore .93"
    Wheel cylinder bore 1.5" (dual) front 1.6" rear
    Pedal arc ratio 4.0 to 1
    Line pressure with 100 lb on pedal 1160 front 680 rear

  3. #3

    Default

    Thank You.

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