Clutch issue - air in line

[aka_juffa]

A few weeks ago I noticed that the clutch pedal had become spongey. There was a bit of fluid in the slave cylinder boot, I bought a rebuild kit from mx5parts UK. Fitted it and bled the system. Clutch still spongey, so I bought a complete slave cylinder, and bled the system. Still spongey.

So I had the lovely Jennifer assist me yesterday by pumping the clutch pedal while I watched the bleed tube. Waited until the bigger bubbles were cleared, although there was a constant supply of smaller bubbles. I put a whole bottle of fresh Castrol Dot 4 through the clutch system. While the pedal is better, the pressure will drop if I hold my foot on the pedal for any length of time.

I think I might have a air leak in the system somewhere?

Any thoughts from the forum?

J.

[hks_kansei]

Check all the places it has a join (clutch master, slave, lines between)

Check the bleed nipple is tightened properly.

Check soft lines (can't remember if the clutch has any soft lines)

[NitroDann]

When you crack the nipple it should come out in a solid stream.

Dann

[93_Clubman]

Might be time for a new master cylinder or a kit if available.