dani_r Posted September 29, 2009 Share Posted September 29, 2009 I did a straightliners event here in the Isle of Man last weekend, and although the car ran really well, the day after, my clutch pedal felt totally different. I have an NA-TT with an RPS Street Max Clutch. It's only a few months old and when I picked up the car with the new clutch the pedal was totally stiff all the way to the floor, with the biting point pretty much at the floor. Over time the biting point moved up as was to be expected, but the pedal remained stiff all the way, with only a slight bit of slack in the pedal. After the straightliners event there is now slack in the pedal of a few inches then you get the stiffness in the pedal, and the biting point is right at the floor again. Can anyone suggest what's happened here? I imagine that if I had worn the clutch, that the biting point would have infact moved UP and not down, and would not account for the slack in the pedal. I have spoken to someone about this, and they suggested that there is an air bubble in the system from the hot temps achieved at straightliners and that I should just bleed the system. Does this sound right? Thanks, and sorry for the drawn out thread, I just wanted to explain as best as possible the situation. Dan Quote Link to comment Share on other sites More sharing options...
mike_mcevoy Posted September 29, 2009 Share Posted September 29, 2009 what is the clutch fluid level like. I was starting to heat the Clutch fluid up quite a bit on the first day but I found the pedal starting to stiffen up rather than slacken off? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 29, 2009 Share Posted September 29, 2009 The clutch cover diaphragm fingers may have taken a set with the heat. Quite what that may do for the longevity of the clutch is anyone's guess, but being a pessimist I doubt it'll be favourable Quote Link to comment Share on other sites More sharing options...
dani_r Posted September 29, 2009 Author Share Posted September 29, 2009 The clutch cover diaphragm fingers may have taken a set with the heat. Quite what that may do for the longevity of the clutch is anyone's guess, but being a pessimist I doubt it'll be favourable So what's the solution? Surely not a new clutch!? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 29, 2009 Share Posted September 29, 2009 Well, if that's what HAS happened, and I am only making a measured guess, then yes, and if it's got hot enough to cook the diaphragm the flywheel may not be too happy either. How many spirited starts did you make? Drag racing is a transmission killer, where as I buy tyres, brakes and Rose joints, you lot buy clutches, flywheels, gearboxes and diffs We all spend a fortune, going straight, or around the corners. Quote Link to comment Share on other sites More sharing options...
dani_r Posted September 29, 2009 Author Share Posted September 29, 2009 Well, if that's what HAS happened, and I am only making a measured guess, then yes, and if it's got hot enough to cook the diaphragm the flywheel may not be too happy either. How many spirited starts did you make? Drag racing is a transmission killer, where as I buy tyres, brakes and Rose joints, you lot buy clutches, flywheels, gearboxes and diffs We all spend a fortune, going straight, or around the corners. I made quite a few runs to be honest. This is rubbish. It appears I got carried away! The annoying thing is that this clutch has only been on a few months! It still works totally fine, it still pulls well, it's just slackened off. I guess the only way to find out what's happened is to get the gearbox off then? If so, what am I looking for? Quote Link to comment Share on other sites More sharing options...
dani_r Posted September 29, 2009 Author Share Posted September 29, 2009 Also, might be worth mentioning, but the slack in the pedal wasn't apparent until the next day. Not sure if that's relevant Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 30, 2009 Share Posted September 30, 2009 Try bleeding it after cleaning the master and slave cylinders (stripping them fully to clean them properly), fit new seal kits if the seals look bad. Quote Link to comment Share on other sites More sharing options...
dani_r Posted September 30, 2009 Author Share Posted September 30, 2009 Try bleeding it after cleaning the master and slave cylinders (stripping them fully to clean them properly), fit new seal kits if the seals look bad. I actually refurbed my master cyliner earlier in the year with new seals etc, should it pull it apart again? I didn't do the slave, so will give that a whirl. Quote Link to comment Share on other sites More sharing options...
dani_r Posted October 1, 2009 Author Share Posted October 1, 2009 I've just parked up and had a look at the fluid levels, and the clutch fluid, although clean, is slightly below minimum level. Obviously this needs topping up, but what does it mean? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 1, 2009 Share Posted October 1, 2009 Err, the fluid is low? Try bleeding it through again, and see what happens. If bleeding restores normal operation check for a weep behind the slave and master cylinder boots. Reseal the slave if the bore is 100%, if the master is leaking after re sealing, renew it. Quote Link to comment Share on other sites More sharing options...
dani_r Posted October 1, 2009 Author Share Posted October 1, 2009 Err, the fluid is low? Try bleeding it through again, and see what happens. If bleeding restores normal operation check for a weep behind the slave and master cylinder boots. Reseal the slave if the bore is 100%, if the master is leaking after re sealing, renew it. Top man Cheers Chris. I'll get stuck into that and let you know. I've ordered a new slave cylinder seal kit ready for the weekend anyway. Dan Quote Link to comment Share on other sites More sharing options...
Guest jtt97 Posted October 2, 2009 Share Posted October 2, 2009 This happened to my clutch pedal. It seems to be a common issue. Just something for you to check. Hopefully that is not your problem. http://www.supraforums.com/forum/showthread.php?t=359984 Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 2, 2009 Share Posted October 2, 2009 I think this is only an issue in LHD cars, RHD ones do not, as far as I can remeber, have this set up. Good home repair though! Quote Link to comment Share on other sites More sharing options...
Guest jtt97 Posted October 2, 2009 Share Posted October 2, 2009 I think this is only an issue in LHD cars, RHD ones do not, as far as I can remeber, have this set up. Good home repair though! Your lucky if that is the case. This seems a pretty common defect in the US cars. Quote Link to comment Share on other sites More sharing options...
dani_r Posted October 3, 2009 Author Share Posted October 3, 2009 This happened to my clutch pedal. It seems to be a common issue. Just something for you to check. Hopefully that is not your problem. http://www.supraforums.com/forum/showthread.php?t=359984 Wow, that's an interesting thread! I would have never though of that to be honest. Certainly something to bear in mind! Quote Link to comment Share on other sites More sharing options...
dani_r Posted October 3, 2009 Author Share Posted October 3, 2009 I think this is only an issue in LHD cars, RHD ones do not, as far as I can remeber, have this set up. Good home repair though! How come this would only be a LHD problem Chris? Aren't the cars made pretty much the same way, just on the opposite side? Quote Link to comment Share on other sites More sharing options...
Guest jtt97 Posted October 6, 2009 Share Posted October 6, 2009 How come this would only be a LHD problem Chris? Aren't the cars made pretty much the same way, just on the opposite side? I was thinking the same thing. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 6, 2009 Share Posted October 6, 2009 No, because the clutch is by the door in a LHD car, and by the tunnel in a RHD car. I would imagine it was designed as a RHD car but with a mind to letting the US market have a version as well. I am sure that bracket isn't on a RHD car. You have one, so have a look Quote Link to comment Share on other sites More sharing options...
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