Lower and lower clutch biting point

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MeatyMc

New Member
Posts
26
Location
Yorkshire
Hi

This is obviously not a unique problem but the threads I've found tend to relate to issues after a new plate has been fitted which doesn't apply in my case. 90 truck cab with 115k on the clock - 6k done since purchased 15 months ago. Have a lot of old receipts but no mention of any work on the clutch but that doesn't mean a lot obviously.

There has been no slippage whatsoever just the biting point got lower and lower over a distance of 4/5 miles. Seemed to steady off at around an inch from the floor but reluctant to risk it getting worse to the point can't get into gear so sat on drive - bloody annoying having soft-topped it the weekend before with the weather as it is!

No signs of fluid loss anywhere - cylinder still full and master cylinder nice and tight when depressed by hand from above. Clutch pedal set 2 cm too high so lowered to 140mm from floor as per manual but can't see this would have any impact.

Guess we try replacing the fluid although understand this is a pain - any idea what quantity is needed by the way? Then, if no better, replacing the master and/or slave but see comment on master above. Is there any other way of determining the fault source and what else might it be???

Any comments appreciated.

Cheers
 
Mines does this on occasion which I find very odd but when I check my fluid level has dropped right down to pretty much nothing. It's strange because its not leaking anywhere that I can see, top it back up and all is well with the biting point where it should be
 
There's no drop in the master cylinder reservoir level in my case. I did wonder whether there is a seal on the master cylinder 'plunger' that might be going and not pushing sufficient fluid down the system but that doesn't seem to stack up either.

Oh and by the way, the breather on the cylinder cap is clear as well - a comment seen elsewhere as a potential fault.
 
Could be the flexi bulging which prevents the rod from operating the clutch or the rod is slowly working its way through the clutch fork.
 
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