hydraulic clutch

Standard & modified running gear

hydraulic clutch

Postby ruairidh » Sun Apr 30, 2017 6:07 pm

I am having trouble getting my clutch to stiffen up.
Replaced slave cylinder as had leak last year and have bled it and got all the air out.
Just thought should I have bled master as well?
Thanks.
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Re: hydraulic clutch

Postby Custard » Sun Apr 30, 2017 9:20 pm

It is all one system so the air should come out through the bleed nipple on the slave cylinder.

Does it not work then?

It won't stiffen up like a brake pedal as it is only pushing against the spring of the clutch plate, so if it produces enough travel and a consistent bite point then it should be all ok.

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Re: hydraulic clutch

Postby ruairidh » Mon May 01, 2017 10:09 am

Its a new slave cylinder from mini but when underneath and my wife deploys pedal the rod is hardly moving.
Have not tried with engine running as battery was flat will try later.
Its as if system is not pressurised.
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Re: hydraulic clutch

Postby 2fry » Mon May 01, 2017 10:55 am

Try back bleeding it.This was the only way mine would work.

Drain the system and fill the master cylinder from the slave bleed nipple.
A squeesable plastic bottle with the tube firmly attached will do the job.

This should work first time,if it dos'nt the seals are fecked.....

Enjoy.

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Re: hydraulic clutch

Postby woodywoodchipper » Mon May 01, 2017 1:20 pm

which Mini cylinder have you used, there are 2, ones is under an 1'' and 1 is over an 1'' if you have the larger that may be the problem, as the pressure is running out before it can move anything, also the master does not want to be over 3/4 ''
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Re: hydraulic clutch

Postby gjoakes » Mon May 01, 2017 1:56 pm

My experience has been that the secret to beeding a clutch system is to make sure the bleed nipple on the slave is in the "up-most" position. Sometimes this means taking it off the car and restraining the cylinder (with a c-clamp for instance). Once that is done then just bleed using method of choice.

In my MM I have a Midget 1275 slave on a 1275 ribcase/clutch and bleeding was routine. I did have to adjust the mechanical linkage on the master (3/4" bore Wilwood) to get adequate stroke at the slave.
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Re: hydraulic clutch

Postby ruairidh » Mon May 01, 2017 7:56 pm

When I went back to it tonight the bleed nipple was down thw way have turned it up so will try that.
Have not bled it yet going to try 2fry's idea if I can find a squeezy bottle.
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Re: hydraulic clutch

Postby ruairidh » Sun May 21, 2017 8:02 pm

Success think it was a combination of not being adjusted properly and bleed nipple in wrong place.
Just need to bleed brakes now and should be sorted. :)
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Re: hydraulic clutch

Postby qwertyhenry » Sun May 21, 2017 11:15 pm

good on you Campbell :D :D :D :D :D
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