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Thread: clutch pedal failure

  1. #1
    Join Date
    Apr 2017
    Location
    Kansas City
    Posts
    39
    My Cars
    E36 M3

    clutch pedal failure

    Ok, here goes nothing.

    Clutch went to the floor as earlier stated, replaced the master and slave and bled the piss out of it. Someone with 30+ years of experience of working with bmws is doing the work. He cannot seem to figure it out. He said next step is to remove the gearbox, what would need to be replaced? The clutch? It didnt slip at all, it actually felt really good. I have been dealing with this for a few months now, and would like to have this resolved, what could it be?

  2. #2
    Join Date
    Jan 2007
    Location
    SoCal
    Posts
    30
    My Cars
    540i/6, others
    If the slave pushrod is moving properly, the gearbox needs to come out to properly diagnose & fix. Either the release fork has failed or the pressure plate has an internal problem (diaphragm broken?). It could also be a badly worn release bearing collar, but less likely.

    Sent from my SM-G930P using Tapatalk

  3. #3
    Join Date
    Jan 2002
    Location
    outta SoCal, now CO
    Posts
    1,212
    My Cars
    '98 M3 Alpine White
    With all those new parts I'd look under the dash while pushing the clutch pedal just to make sure the rod on the master is moving and the plastic clutch pedal isn't cracked or broken. They make metal replacements, by the way. At that point, assuming all the air is out, then as mentioned above, the transmission comes out. Could be the $2 plastic pivot broke.
    See ya later,

    tony
    '98 M3, '92 Dinan3, '05 R1100S BCR, '07 R1200S, Aprilia T

  4. #4
    Join Date
    Feb 2003
    Location
    BKLYN, NY
    Posts
    8,514
    My Cars
    98 M3/4/6, 16 M3/6
    I doubt its anything to do with the transmission. You would get pressure in the clutch pedal if the hydraulics were fine but they are not.

    You are having pressure issues with the hydraulics of the clutch pedal or maybe the clutch pedal assembly wasnt installed correctly. Have you seen any brake fluid leaks? Maybe one of the new cylinders have bad seals?

    I've heard of people bench bleeding the slave but i never had to. I use a power bleeder when i replaced my slave cylinder. Look for leaks.
    Last edited by hc1001; 08-17-2017 at 10:59 PM.

  5. #5
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    Check the pedal itself at the upper bushings. These pedal arms eventually deform.

    I agree the pivot pin could be an issue. Maybe you could see over there with an inspection camera put through the slave hole.

    I always bleed the slave by hand with the slave removed and bleed valve pointing up. A new master requires bleeding also but is self bleeding and may require about 100 pumps or lifts of the pedal. But a 30 year bmw mechanic would know this.

  6. #6
    Join Date
    Jun 2009
    Location
    washington dc
    Posts
    8,679
    My Cars
    Avus Cosmos Calypso!
    check for leaks first, then broken bits in the pedal area, then trace the lines, then report back.

  7. #7
    Join Date
    Apr 2006
    Location
    ORD
    Posts
    1,495
    My Cars
    4Runner/911
    What year is the car? The later ones are self bleeding and can be installed on an older car. Well worth it.
    1988 911 - Carb'd - Twin Plug - 3.6
    1999 SL 500
    2016 4Runner TEP - Gone
    1995 M3 - LS2 - Gone
    1998 M3 - Gone
    1991 M5 - Gone
    1993 RS America - Gone
    1995 M3 - Gone

  8. #8
    Join Date
    Apr 2017
    Location
    Kansas City
    Posts
    39
    My Cars
    E36 M3
    The car is a 97, we went ahead and dropped the gearbox, the clutch was shot, and the friction plate scorched in a couple places. The car had a M5 clutch and UUC ltw flywheel, so I bought a new m5 clutch and friction plate, parts arrived today and would be going on the car. In addition, while it was down the gearbox had the detents done, input and output seals, etc etc, and because the car had cheap flebay headers, I put stock manifolds back on with new bimmerworld exhaust because ya know why not. We will see if the clutch being replaced solves the issue. To be clear, there were no leaks in any of the lines and the systems had been bled with a power bleeder.

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