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E30 5 lug swap brakes not bleeding properly

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    E30 5 lug swap brakes not bleeding properly

    Hi all I am new to this forum since I just bought a 92 e30 with an m50 swap and recently did a 5 lug swap with fronts replaced with a 97 m3 and rears were a z3 l6 hub and e36 rear calipers with 318ti carriers. everything been fine, except I can’t seem to bleed these brakes for some reason. Using dot 3 , I’ve bled this car with engine off and on from rear right, rear left, right front, left front, and slave cylinder. Well brakes are still spongy, but works. The calipers, brake pad are remanufactured and pads new. Rotors new and fronts were cut.

    Am I missing something??? Never have I had this problem ever. Any advice would help.

    #2
    First, are you getting fluid out of the bleeders? With the swap, are the caliper bleeders at the highest point on the caliper? What method are you using to bleed (pump and hold, power bleeder, suction)?
    2004 525i Manual - 1985 325E Coupe Manual

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      #3
      I’m using the pump and hold. With engine on and off. Also the calipers bleeders are low base side of the calipers.

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        #4
        Originally posted by Maxdtran View Post
        I’Also the calipers bleeders are low base side of the calipers.
        Are you sure you have the calipers on the correct side? Bleeders should be the highest point on the caliper.
        2004 525i Manual - 1985 325E Coupe Manual

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          #5
          Calipers flipped for bleeders to be on top. Master cylinder replaced. Still the brakes go soft after the engine turns on and I lose pressure. Only thing left that I’ve been reading is to trigger the ABS so the valve solenoid to open and bleed any air out of the system. So I read up on old threads to either jump pins 2 and 11 on the ABS unit itself or ground pins 27 and 28 on the control module itself (located underneath the cluster driver side) bad part is there’s no numbers on the ABD unit itself or the control module. The older threads do not have any clear photos. So if anyone knows how to figure out the pins. Please advise... thanks

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            #6
            Try to gravity bleed until you get fluid.......I would imagine you still have some air in there.

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              #7
              Two things. Have you tried to bleed the pump with the bleeder on the pump itself? Another post mentioned after you bleed the brakes go out and find some soft surfaces and force the ABS pump to activate.
              2004 525i Manual - 1985 325E Coupe Manual

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                #8
                Two things. Have you tried to bleed the pump with the bleeder on the pump itself? Another post mentioned after you bleed the brakes go out and find some soft surfaces and force the ABS pump to activate.
                2004 525i Manual - 1985 325E Coupe Manual

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                  #9
                  With a new MC you need to bench bleed it very slowly and watch all the bubbles come out because there is allot with a brand new brake master.
                  Also are you using the 25mm because the stock MC is too small and feel very spongy then BAM it will want to lock up.

                  other then those two key things assuming the calipers are on the correct side it should bleed good.
                  maybe tap them will a small hammer while bleeding because tiny air pockets do like to stick in there.

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