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Thread: Confirm my diagnosis

  1. #1
    Hmmm 1st Gen's Avatar
    Donated: $20

    1991 Protege LX

    Join Date
    Feb 2004

    Confirm my diagnosis

    Since I don't drive the wife's car often it's always a surprise to find out what condition it's in when i do. It's an 06 Mazda 3 hatch with the 2.3 liter engine.
    While running an errand I realized the brake peddle was loosing pressure while I sat at a stop light. The car stops fine, but once stopped, the peddle would depress almost clear to the floor. I could release the peddle and push it again as if to reset it and it would have pressure, but it would slowing depress again.

    I'm thinking master cylinder.


    I am a non believer

  2. #2
    Registered Member concept's Avatar

    2014 Mazda3 S GT auto, 2008 MX5 6-speed

    Join Date
    Mar 2009
    San Diego
    Either that or a leak.
    By the way, it is possible to accelerate master cylinder seal wear by using a "depress the brake pedal to the floor" technique when bleeding brake fluid. Doing it this way allows the MC piston to move past the slight (wear) step in the cylinder bore, damaging the piston seal in the process.

    It is always better to either pressurize the fluid in the MC reservoir, pull (by vacuum), or gravity bleed the brake fluid.
    2014 3S GT, Deep Crystal Blue, Eibach Pro-Kit, Enkei PF01s, Koni Sports
    2008 MX-5 Touring (Mazdaspeed CAI, HIDs, Progress/Koni Sports/Racing Beat sways, Magnaflow)
    2002 Protege ES (Sold for $1700 with 131,000 miles)

  3. #3
    Registered Member

    Mazda3 Sport GS-Sky 2012

    Join Date
    Sep 2014
    Quote Originally Posted by concept View Post
    ... It is always better to either pressurize the fluid in the MC reservoir, pull (by vacuum), or gravity bleed the brake fluid.
    Or just gently stroke the pedal with your hand, rather than jamming it down with your foot like the car is about to drive over a cliff. The purpose is only to flush fluid through with minimal pressure.
    Last edited by BrianM3GS; 05-28-2017 at 12:35 AM.

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