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How to test a master cylinder?

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  • #537000
    BlakeBlake
    Participant

      I have a 1990 Chevy Lumina. I bleed the brakes had a nice firm brake pedal when doing this and once I started the engine the petal went spongy and soft. Is there anyway of testing the master cylinder?

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    • #537007
      619DioFan619DioFan
      Participant

        Is this a new master cyl that was installed ? if so was it bench bled prior to install ?

        if an old master that was still on the car – pull the check valve on the brake booster and see if any fluid is inside the booster- if so the master rear seal is leaking. also check under the dash were the brake pedal push rod goes through the firewall , check for brake fluid there.

        #537013
        MarkMark
        Participant

          How did you bleed the brakes? If all you did was flush the fluid or perform a bleed after a brake job it may be possible that you some how allowed air to get sucked back up through the bleeder. In this case I would look at your procedure for bleeding and change it as necessary or just re bleed the brakes and go from there. Also I agree with the above post.

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