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Thread: Major brake problems, seized calliper like problem

  1. #1
    Join Date
    Dec 2003
    Location
    Canada, ON
    Posts
    732

    Default Major brake problems, seized calliper like problem

    Front right calliper.
    The wheel wouldn't turn, so I supsected a seized calliper. Rebuilt it.
    Then I noticed that no fluid is coming from the line.
    I disconnected the line, pressed the brake pedal and nothing came out...
    I disconnected the line from the ABS central unit and blow air, the line isn't obstructed.

    There is two lines coming out of the master cylinder and going into the ABS central unit. Then all the other lines are going from the ABS to the callipers.

    Could it be a problem with the ABS unit???
    Can you easilly pull an ABS unit out and replace it with another one??? Is bleeding a problem in this case???

    Thanks for the help.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars

  2. #2
    Join Date
    Jan 2004
    Posts
    4,150

    Default Bruno, the front right caliper and the left rear caliper are on the

    same circuit on your car... Is the left rear also locked up...Also the brake line on the master cylinder thats closest to the booster is the one that feeds the front right and left rear...I personally haven't seen an abs unit cause this but I don't know what to tell you without seeing the car..










    Quote Originally Posted by Bruno
    Front right calliper.
    The wheel wouldn't turn, so I supsected a seized calliper. Rebuilt it.
    Then I noticed that no fluid is coming from the line.
    I disconnected the line, pressed the brake pedal and nothing came out...
    I disconnected the line from the ABS central unit and blow air, the line isn't obstructed.

    There is two lines coming out of the master cylinder and going into the ABS central unit. Then all the other lines are going from the ABS to the callipers.

    Could it be a problem with the ABS unit???
    Can you easilly pull an ABS unit out and replace it with another one??? Is bleeding a problem in this case???

    Thanks for the help.

  3. #3
    Join Date
    Dec 2003
    Location
    Canada, ON
    Posts
    732

    Default

    Sorry It was the front LEFT.

    But I will follow your advice, I need to lift the rear to see if there is a problem with the rear. I have never seen this problem, I will check the rear right, but I don't think that the rear has any problems as I changed the rear brakes....

    Very odd. If the rear left also has a problem then I will suspect the master cylinder.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars

  4. #4
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    stupid problems are the most complexing, keep with it Bruno.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  5. #5
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    i have had a couple abs pumps die from a locked up solonoid, one on my 535, id mash the brake and the lf wheel would lock and stay locked till i loosened a line and pissed out the pressure, i traced it to the pump by cracking lines till i got to one that didn't unlock the wheel. on the early e34 it's a 4 channel abs system, 2 lines into the pump and 4 out, around 92 they changed to the later 3 channel system 2 lines in 3 lines out (they combined the rear into one)
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  6. #6
    Join Date
    Dec 2003
    Location
    Canada, ON
    Posts
    732

    Default Found the problem.

    There was quite a lot of foreign elements flotting in the brake lines.
    So I gently tapped on the ABS unit then flushed the brake fluid.... And voila.

    Everything works. Thanks guys.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars

  7. #7
    Join Date
    Dec 2003
    Location
    Dunlap Illinois
    Posts
    1,198

    Default

    Hey I know this great guy that sells those Brake Pressure Bleeders...=)

    I had trouble with the MB's front brakes dragging something terrible after using the brakes 3 times. Come to find out, the master cylinder was binding after the 3rd time of compression every time. Replaced the MC and like your problem, it went away...trouble is, it was $90 from BMA...not as reasonable as yours!!!

    Glad it works for you,

    You coming to the Chicago Pic-Nic? You and Gordon and Mark D could caravan....=)

  8. #8
    Join Date
    Dec 2003
    Location
    Canada, ON
    Posts
    732

    Default

    Sounds nice and it has been awhile since I went to Chicago.
    But I will have to pass. I need to look for a location in the area and work on my business plan. I also need to finish my Canadian part store: www.racingking.ca
    And I need to work on my race car project: E36 325is. And I need to try to trade the winter 525i for a E36 318is.

    I am still keeping the 535i.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars

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