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  • Clutch dragging issue

    Dear all,

    I'm having an issue with my clutch. When hot it hates going into gear, I'm sure that the clutch is dragging because, when hot, if the car is stationary if I put it in first, clutch in and rev the car, the car still moves forward.

    The car has the Earls braided line fitted and I had my trusted Indy bleed the clutch yesterday but this hasn't made any difference.

    The clutch on the car is under 30k old... so I am open to suggestion here?!

    Many thanks.

  • #2
    Are the clutch master and slave the original items? If so might be worth replacing.

    Also, the clutch slave cylinder can be a pig to bleed. In fact BMW have a special tool to depress the plunger. I have read that some people need to remove it from the bell housing so the bleed nipple faces upwards.

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    • #3
      Does it help if you pump the pedal?
      2000 Cosmos Black S50, Kyalami/Black interior, KW V3s, H&R ARBs, Supersprint exhausts, Apex ARC8s.
      1996 Dark Aubergine Escort Cosworth Lux with leather, GGR 305 chipped, GGR/Koni suspension, Black Diamond discs.
      2008 Orange/Black Westfield Megabusa, FW rear, Widetrack/Nitron Suspension, AP/Westfield 4 pots.
      Lots of Land Rovers!
      No wife or kids!!

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      • #4
        It could be the master or slave cylinder is leaking. I think it is possible for the master cylinder to leak internally, so there is no obvious leak but loses pedal pressure.

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        • #5
          Originally posted by Mad Max
          Yes, when stationary two pumps of the clutch pedal will help it get into gear.
          If pumping helps, it's most likely that it needs bleeding or that it's in need of a new master cylinder.
          2000 Cosmos Black S50, Kyalami/Black interior, KW V3s, H&R ARBs, Supersprint exhausts, Apex ARC8s.
          1996 Dark Aubergine Escort Cosworth Lux with leather, GGR 305 chipped, GGR/Koni suspension, Black Diamond discs.
          2008 Orange/Black Westfield Megabusa, FW rear, Widetrack/Nitron Suspension, AP/Westfield 4 pots.
          Lots of Land Rovers!
          No wife or kids!!

          Comment


          • #6
            I wouldn't take it to BMW personally. It's just an old car, nothing mysterious or complex. Agree master cylinder is rare to fail though, I've never heard of it happening. The only thing to explain the loss of pressure is a leak or the M/C failing internally though.

            The slave needs to be bled off the gearbox with the plunger fully depressed, doesn't require a special tool, just something to keep the plunger fully in whilst being bled.

            Assuming it's now not the M/C, I would do as follows;

            - Bleed slave again, ensuring the cylinder is removed from the gearbox and the plunger is fully pushed in when bleeding.
            - Check for any small leaks in the line, especially since a new line has been fitted
            - Change the gearbox oil to AMSOIL MTF

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            • #7
              Cant remember where you live Max but you could try Darren woods in Stockport if that isn't too far?

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              • #8
                Sounds promising as that tallies with your symptoms.

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                • #9
                  Update - New slave fitted today. Definitely an improvement, but definitely not fixed...

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                  • #10
                    Another update - I removed the clutch stop. Clutch feels fantastic now...!

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                    • #11
                      Ok, after initially thinking I'd solved the issue, it's still there. I gave Darren Woods a call and ended up speaking to Darren himself - what a nice chap. After listing off what had been replaced he was head scratching too. Clutch twice, once with flywheel, braided line, CDV removal, two slave cylinders, the damned car has even had a new clutch pedal installed a few years back.

                      He suggested what someone else had suggested to me before - weld a few millimetres of metal on to the end of the slave cylinders piston pin. He also suggested looking for an OEM slave that had a longer pin and either using that slave or swapping the pin from it into the existing slave.

                      I went away and Google'd BMW slave pins and found this:

                      http://www.rogueengineering.com/Rogu...Pin_p_235.html

                      I wonder... could this be the solution?

                      Comment


                      • #12
                        Rogue Engineering emailed back, part will fit and to contact CA International to purchase it.

                        So, I'll get it ordered, fitted and adjusted, then report back.

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                        • #13
                          Going back in the cars records again, I found that the car had it's master cylinder replaced by Munich Legends in 2012 alongside the pedal itself.... That's the whole system.

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                          • #14
                            Very puzzling. Watching with interest to see how this gets resolved. Can’t be much else left to try!
                            1998 ///M Coupe

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                            • #15
                              Ok, good news - this is now solved.

                              Along the way I've spoken to some great people in the community. Darren Woods is a great chap, had a good chat with him that got me onto the idea of a longer pin and again today to let him know that it worked. Ben at Rogue was great, as was Roy at CA who imports Rogue stuff.

                              It is as simple as Rogue's YT video that he made for me shows, remove the slave, pop out the pin that's in it and pop the new pin in. The pin adjusts from 85-95mm in length. The standard pin is 90mm including it's rubber end cap. I first dialled the adjustable pin to 92mm and installed it. It felt better, about 1/2" higher engagement point, but could be better.

                              We then dialled it to 95mm, clutch engagement is now about 1" off the floor.

                              So, during the history of my particular M Coupe, this has obviously been a big issue. Just before my ownership in 2012 Munich Legends went so far as to replace the clutch pedal, master cylinder, slave cylinder and hose - as the clutch and pivots had just been done by BMW that's a full house, if you're playing clutch system bingo.

                              As this is a widely known issue with these cars - please, if you have a low engagement point and want to change it - try this £65 adjustable slave pin before spending thousands and thousands on new hydraulics and clutches!
                              Last edited by Mad Max; 26-10-2018, 12:05 PM. Reason: My own grammar!

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