Clutch failure, master or slave failure?
 

After an hour break in a long journey I pulled away normally in first gear, then went to change to second and pedal went to the floor, so unable to disengage the clutch.

Question is is there a way to determine whether it's the slave or master cylinder that has failed. Fluid only slightly down, I have topped up and there is no loss despite working the pedal. There does seem to be spring resistance towards the bottom of pedal travel.

You can understand I don't want to be taking the gearbox out in this weather if I can avoid it.

Disconnect the quick release coupling at the gearbox, press the clutch pedal.. if the pedal is rock hard it’s the slave that’s failed


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mmmmm if the internal seal in the master has failed and fluid is passing back behind the seal when the clutch pedal is pushed, so fluid is staying in the master reservoir, will the pedal still sink to the floor even with the quick release apart?

check around the master for fluid, if wet then master has failed?
If no fluid found, remove cap from master and then remove the rubber inside. If no fluid salve has failed? The master does not hold much fluid and perhaps is only half full when the rubber is removed but if there is no fluid loss then again the master may well have failed internally


macafee2

I am confused. There is just the one filler cap for a brake/clutch fluid reservoir, yet the clutch master cylinder has its own cap.
I have topped up the main reservoir and the level has held. If the slave had failed would the level drop to a certain point but of course not so far hat the braking system was compromised.?

Thanks for this advice Trickey, and you Macafee. Confused by the single main reservoir yet the cap on the master which I've yet to access. I think next job will be to disconnect the coupling but it's too damn cold today. This is why I always attempt to keep a second 75 with a current MOT for such emergencies.

Sounds like you've got a Haynes! The brake fluid reservoir has nothing to do with the clutch, it has its own on top of the clutch master.

Regards

As Vitesse says the clutch master reservoir is located on top of the clutch pedal under the dash.The clutch and brake system are totally independent systems.

Thank you Vitesse and number 6. Yes, I was referring to Haynes. As a result my original post is likely to be totally wrong so will need to investigate from scratch on boxing day.

Yer tis-----------------


The white cap just behind the green collar.