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Thread: Do I need a new master cylinder???

  1. #1
    Join Date
    Jan 2006
    Location
    South Milwaukee, WI
    Posts
    245

    Default Do I need a new master cylinder???

    As I approach 300K miles on the LB7, I noticed that even after a complete brake job, I just don't seem to be able to maintain a good stiff feel on the brake pedal. Anyone ever have to replace their master cylinder on a '01 2500HD? I'm wondering if it's time for a replacement? Anyone?
    "Chessy56"
    So. Milwaukee, WI
    '01 2500HD, LB7, ~440K miles
    "Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

    '17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!!) Currently bone stock, 120K miles.

    "Socialism is a philosophy of failure, the creed of ignorance and
    the gospel of envy. Its inherent virtue is the equal sharing of misery."
    Winston Churchill

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    Many things can cause a "soft" brake pedal. If it isn't leaking down (bleeding off while standing on the brakes for a long period), then the MC is probably OK. The leading cause of soft pedal is air in the lines and/or calipers. Others include worn out soft lines (hoses, they can get "spongy"), broken/cracked brackets, or sloppy/worn adjusters.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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