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Clutch master cylinder bleeding

Started by Don D, November 24, 2024, 08:44:30 PM

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Don D

Hi guys

After starting the Hesketh this morning I found that the clutch would not disengage. I took off the master cylinder, cleaned it out, and installed new seals. The manual indicates that bleeding the system is as simple as opening the bleed valve at the lower end. But I've had no luck getting the air out of the system, that is no pressure is being applied when the LH lever is actuated.

Curiously, this master cylinder has only one bottom hole (I was expecting two). Also, I've tried to verify that the line is clear by applying compressed air at either end while the hose is disconnected - not really a positive test what with the banjo fittings.  In any event, lever action does not induce a flow of fluid at the bottom end of the hose.

What am I missing?

           

Dave Snr

Hi Don,
I assume you have the standard Brembo M/C and are using a genuine Brembo PS15 seal kit. Testing the M/C on the bench with some fluid in the reservoir you should get fluid coming out of the banjo connection point and when you actuate the lever, fluid at pressure! If you don'e get fluid then reason could be blocked hole that allows fluid from the reservoir into the cylinder or the piston is not retracting fully to uncover the hole. Or you have damaged seals or corroded bore. Try applying compressed air to the banjo connection on the M/C and air should come out through the reservoir.
Hope this helps.
Dave