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soft brake pedal !!! HELP

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    #1

    soft brake pedal !!! HELP

    hi r3v members! i have question about brakes on my e30 91 coupe. i have 4pot brembo calippers (e38) on each wheel! i replaced brake master cylinder, i replaced brake lines and hoses, everything in brake system, a bled whole brake system with machine and brake pedal is still very soft. and it brakes weak.

    please help me with it!

    i bled: passenger rear wheel (inner-outer) > driver rear (inner-outer) > passenger front (inner-outer) > driver wheel (inner - outer)
    Tags: None
    #2
    Try to bleed it again and see if any more air coming out. You might have bad slave cylinder.

    Esquire E30 Build (87 325i Vert)
    Ultimate Tanning Machine

    Comment

      #3
      since when is this issue happening? was it working fine with the 4pot calipers, or that happens since you upgraded?

      i mean if you put 4pot calipers with a bigger piston area than the stock ones, and keep the stock rears. both the brake bias and brake feel will be affected.
      ---E30 320i Hennarot 1984 Sedan---

      Comment

        #4
        Originally posted by Coyote_ar View Post
        since when is this issue happening? was it working fine with the 4pot calipers, or that happens since you upgraded?

        i mean if you put 4pot calipers with a bigger piston area than the stock ones, and keep the stock rears. both the brake bias and brake feel will be affected.
        This issue starts when i replace whole brake system from donor 316i to 325mm 4pot calippers on each wheel. I have relocated brake booster (behind left headlight).

        When i beed out each calipper, the air bubbles coming out - thats good.

        Comment

          #5
          Did you continue till bubbles stop coming out ?

          Esquire E30 Build (87 325i Vert)
          Ultimate Tanning Machine

          Comment

            #6
            Originally posted by aegul44 View Post
            Did you continue till bubbles stop coming out ?
            Yees, of course.

            Comment

              #7
              Does the pedal sink to the floor when you hold your foot on brakes while slowing the car for a stop ? Also did you check your fluid level after filling it up and driving around ? Any decreasing ?

              Esquire E30 Build (87 325i Vert)
              Ultimate Tanning Machine

              Comment

                #8
                Originally posted by aegul44 View Post
                Does the pedal sink to the floor when you hold your foot on brakes while slowing the car for a stop ? Also did you check your fluid level after filling it up and driving around ? Any decreasing ?
                Any decreasing... everything is new. Pedal doesnt sink to the floor, i push it and in half position is little harder. When re-tread pedal it is still soft!.

                Fluid level is good. I am bleeding system with machine wich is control fluid level

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