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    #1

    Lost All Brakes!!

    Hey guys,

    Need a little help. I've got an '84 318i that has a brake issue... the issue being that I don't have any! I was driving along the other day, coming up to an intersection and hit the brakes... my pedal went to the floor! I had been driving around all day with no problem! Luckily I was able to pull into a parking lot and downshift till I coasted to a stop. Now I have looked over the brake lines and this is what baffles me. I can't find a leak anywhere and there is no fluid missing from the reservoir! Even as I pump away, nothing at all! The pedal just goes straight to the floor. If I drive it slow around the block and hit the brake, i can feel it dragging the tiniest bit but they aren't doing their job for sure! What could be the cause?
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    #2
    Sounds like your brake master cylinder quit on you.
    No E30 Club
    Originally posted by MrBurgundy
    Anyways, mustangs are gay and mini vans are faster than your car, you just have to deal with that.

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      #3
      Originally posted by Exodus_2pt0 View Post
      Sounds like your brake master cylinder quit on you.
      "Quit" is putting it mildly..more like "blew out" :)
      Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

      https://www.r3vlimited.com/board/sho...86#post4944786
      Alice the Time Capsule
      http://www.r3vlimited.com/board/showthread.php?t=360504
      87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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        #4
        Yep, replace the master cylinder. And once you have the master cylinder out, use a rag on a wire to check inside of the brake booster for brake fluid. If there is brake fluid inside of the booster, you'll have to replace it. Bake fluid will kill the diaphragm in the booster in short order.

        A rebuilt booster is okay, but only use a new (not rebuilt) master cylinder.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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          #5
          +1^^^ and make sure you bench bleed it before you re-install. good luck
          sigpic

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            #6
            How would you bench bleed the master cylinder? Serious question. Just put brake fluid in it?

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              #7
              Put the master in a vice and fill with brake fluid.

              Plug the output holes with gloved fingers. (Brake fluid will suck the water right out of your skin, leaving you with a nasty chemical burn)

              Then use a punch or screwdriver, and pump the cylinder while keeping your fingers blocking the holes. The idea is that the fluid will push past your fingers, but air won't be able to get back in. It won't take much, but you need to get all of the air out of it.
              No E30 Club
              Originally posted by MrBurgundy
              Anyways, mustangs are gay and mini vans are faster than your car, you just have to deal with that.

              Comment

                #8
                Cool, thanks. I'm going to be replacing my master next year before track season I think and want to be sure to do it right.

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