Brake pedal goes to floor on first pump, but is good on second?

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  • JGood
    R3V OG
    • Jan 2004
    • 7959

    #1

    Brake pedal goes to floor on first pump, but is good on second?

    Just pulled the track car out of winter storage, and noticed the brake pedal goes down pretty far on the first pump. It still engages the brakes fine, but it happens way down near the floor. On the second pump (if I let go and immediately re-apply the brakes) it stops much higher. If I wait 5+ seconds then re-apply the brakes, back down to the floor the pedal goes. I can stop the car just fine, but that just doesn't seem right.

    It's an 87 325is, 1/2 life Hawk HPS, stainless lines all around, new ATE fluid, all about 6 months ago. Brakes were fine for every track event last year, and it just sat for the past 3 months. Is this a booster or vacuum related problem, or whats the deal?

    I drove the car for about an hour, problem never got worse or went away, and no leaks.
    85 325e m60b44 6 speed / 89 535i
    e30 restoration and V8 swap
    24 Hours of Lemons e30 build
  • JGood
    R3V OG
    • Jan 2004
    • 7959

    #2
    Excellent... "Braek". Can a mod change that?
    85 325e m60b44 6 speed / 89 535i
    e30 restoration and V8 swap
    24 Hours of Lemons e30 build

    Comment

    • FredK
      R3V OG
      • Oct 2003
      • 14750

      #3
      your braek master cylinder is toast

      Comment

      • bwanac
        No R3VLimiter
        • Oct 2003
        • 3354

        #4
        voted MC as well... time to upgrade to the 25mm!

        Comment

        • Charlie
          kid tested, administrator approved
          • Oct 2003
          • 6686

          #5
          Time to upgrade to BUG BRAEKS.

          -Charlie
          Swing wild, brake later, don't apologize.
          '89 324d, '76 02, '98 318ti, '03 Z4, '07 MCS, '07 F800s - Bonafide BMW elitist prick.
          FYYFF

          Comment

          • JGood
            R3V OG
            • Jan 2004
            • 7959

            #6
            Cool, what's the deal with the 25mm upgrade? Did a quick search, most of what I read is that it's useless for stock brakes. I like the way the car feels with OEM rotors/Hawk blues, so I don't really want to dump thousands of $$ that I don't have into something better.
            85 325e m60b44 6 speed / 89 535i
            e30 restoration and V8 swap
            24 Hours of Lemons e30 build

            Comment

            • 2002maniac
              R3V Elite
              • Feb 2005
              • 4260

              #7
              The 25mm MC is too stiff with stock calipers. Not an upgrade IMO.

              Comment

              • JGood
                R3V OG
                • Jan 2004
                • 7959

                #8
                Yeah I just read a long ass thread about it, I'm staying stock. So I see the cars prior to 87 with ABS cost about $180, whereas the cars after 5/87 with ABS are about $260. I know Ill get screwed...

                So what's the difference? I'd love to use the cheaper one if possible...


                EDIT: Nevermind, bavauto has one for $179 and the other for $199. Since when the hell is bavauto the cheapest?
                85 325e m60b44 6 speed / 89 535i
                e30 restoration and V8 swap
                24 Hours of Lemons e30 build

                Comment

                • FredK
                  R3V OG
                  • Oct 2003
                  • 14750

                  #9
                  Um EDIT: I bought my 25mm MC from BMA Parts for $122 shipped, including the 5% SPECE30 discount code. PN 34 31 1 156 643. But stock prob works fine too.

                  Comment

                  • JGood
                    R3V OG
                    • Jan 2004
                    • 7959

                    #10
                    Well, shit, if it's 2/3 the price....

                    Is it bolt on, no mods needed?
                    85 325e m60b44 6 speed / 89 535i
                    e30 restoration and V8 swap
                    24 Hours of Lemons e30 build

                    Comment

                    • FredK
                      R3V OG
                      • Oct 2003
                      • 14750

                      #11
                      It was bolt on my late model cars with ABS

                      Comment

                      • banndit
                        Member
                        • Feb 2008
                        • 62

                        #12
                        did you try bleeding the brakes?
                        B

                        Comment

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