Clutch problem / question

[Ainsley]

I'm just about finished on my 420R build, but the clutch isn't quite right.

Basically I cant quite select all the gears with the clutch in.  This is probably because when I initially bled the system, I had the pedal adjuster wound in so there was perhaps too little travel and it doesn't fully depress.  

So I imagine I need to allow it more travel and re blead the system.

But in the box of bits I have left over I see there is a reservoir cap with bellows attached.  This cant be for the brake system, that has the float and switch on it.  So am I supposed to swop the clutch cap the car came with and replace it with the one supplied in the box that has a bellows on it ? 

Not sure why this is necessary, the bellows does what exactly, apart from take up space in the reservoir there by necessitating less fluid.

I'm confused 😞

Anyone got any suggestions ?

Thanks.

[Wrightpayne]

Have you got the AP uprated brake M/C ? That comes with a plain cap / bellows. With the normal cap, leakage can occur on trackdays / sprints etc making a mess of the paintwork!!

[Ainsley]

No, I dont have a uprated AP brakes, so that's what this spare cap and bellows if for.

Thanks.

[David JLM]

Is it this? https://caterhamparts.co.uk/master-cylinder/914-brake-master-cylinder-cap-race-no-float-switch.html

If so, then it's the race cap (as Wrightpayne said above). It does away with the low fluid warning lights, but doesn't leak (apparently!). 

[Ainsley]

Thats the one.

So once I've done with the IVA, I suppose its worth swopping the original for the race cap one to avoid any leaks ?

[SamC]

I would. Mine constantly leaked until I put a non sensor cap on.

The bellows prevent leakage by sealing the reservoir whilst still allowing the fluid volume to expand and contract with piston travel, temp etc.

[AlastairA]

I think most people fit the bellows for track days and refit the standard cap when back on the road. I didn't want to run the car without the low level warning indicator operating and spent some time looking at the fit between the cap and casting. A bit of fettling and it improved a lot - added a sock around the cap and have not suffered from any leaks to date.

Edited April 22 by AlastairA