Wanted: Master clutch cylinder

[magnusfeuer]

My master clutch cylinder has started to leak, and the fluid is quite cloudy.

If anyone has a cylinder laying around, I'd be happy to buy it. A restoration kit would also be appreciated.

Also: Does anyone know the difference between the 5/8" and 0.7" bore? Both are sold by Caterham.

/Magnus F.

[Doug Liedblad]

I have the original M/C - 5/8 bore but don't know if the seals are good. Left over from when I upgraded to the .7" racing M/C. It works better (less travel) with the Outlaw front calipers but more pedal effort.


You're welcome to it but it may be just as easy to rebuild yours.

Did you keep the 5/8" one when you installed the Outlaws?

[escondidoron]

I have a good used Girling 5/8" cylinder in the garage.

[magnusfeuer]

I have the original M/C - 5/8 bore but don't know if the seals are good. Left over from when I upgraded to the .7" racing M/C. It works better (less travel) with the Outlaw front calipers but more pedal effort.


You're welcome to it but it may be just as easy to rebuild yours.

Did you keep the 5/8" one when you installed the Outlaws?

This is the clutch cylinder. I kept the brake master cylinder when I did the brakes, although it needs a rebuild since I ruined it with DOT 5.1 fluid.

[Doug Liedblad]

Sorry, I misread it.

I might have a kit but will have to look.

Also should be available from Pegasus or Summit.

[moosetestbestanden]

If you'd rather go new, you can find them here:

https://www.pegasusautoracing.com/productselection.asp?Product=3500

As far as I was concerned, the price of a new one was easily balanced against the effort and time required to rebuild one. I rebuilt a lot of Girling units back in the day. It's not the most robust design.

[magnusfeuer]

Any idea which bore I should get? The stock setup I have now is really hard, with very short pedal travel between disengaged and engaged. So I guess a greater bore is the way to go?

/Magnus F.

[Doug Liedblad]

larger master cylinder = more pedal force to create the same pressure as a smaller bore.

larger master cylinder = less pedal stroke

So a larger master cylinder gives a harder pedal which needs much more pedal pressure to create the same amount of force but with less travel.

See here: Hydraulics

I think that means go to smaller bore.

[magnusfeuer]

I just installed a 5/8" cylinder, which cut the necessary pedal pressure in about half. Much nicer.

In case somebody needs it, I also have a new 0.70 cylinder, which is the spec installed stock.

/Magnus F.