I've managed to get a clutch pedal and servo thing, but no luck with the vacuum tanks and piping. Does anyone know how this lot works, and do you actually need 2 vacuum tanks? And where do the one way valves fit.

It all looks a bit complicated just to work one servo.

I'm thinking I could just knock something up with just one tank and one valve?

There's a useful pic here, although it's for LHD drive obviously.

 

http://www.courtesyparts.com/z32/oe_clutch-boost.html

Now THAT's what I call a useful pic! Cheers

now... when I had my manual conversion done by a garage known to this forum they left out the vacuum tanks and plumbed it all into the brake servo/system I have been told, and this is apparently a valid mod?

If it's not someone please tell me and if it's not I'll be needing the tanks etc. from someone aswell!!!!!!

Mine was like that originally and I didn't like the feel so I installed the two tanks.

It seems fine to me... though I have to admit I'm not the best driver etc. in the world.

 

So this is a valid mod then? What I'm getting at is, am I putting to much load on the break servo? I'm not right foot breaking so I assume it will be ok?

stricker, I would like to know too if this is a valid mod.

At the end of the day 20inches of vacuum is 20 inches of vacuum, wether it comes from a resevoir tank, or your brake servo.

These things do not consume air, (or vacuum) once they are activated, so the only thing I can see going wrong is that the inlet manifold vacuum cannot get to both the brake and clutch servos fast enough for an immediate response, down a single feed pipe.

In this case, when you brake and clutch at the same time then the pedals would appear slightly heavier than when pressed individually, then shortly after, the pedal pressures would reduce as the vacuum built up again. Hence the inclusion of the vacuum tank.

I suspect this may be the funny feeling AndyP is referring to.

I think I'll try and get just the big tank and pipe that in, but leave the small tank out.

I can't see the need for 2 tanks which are effectively in the same pipe run.

 

If you are comfortable with the feel of your setup then I'd leave it, I can't see how you could cause any damage to anything. The worst thing that you'll get is an initial higher pedal pressure sometimes.

 

Would welcome anyone elses thoughts tho.

I did this a long time ago now so I may have got some of the details confused. But essentially when I blipped the throttle the clutch pedal 'pushed back' at me which is kinda disconcerting when you're hurtling into a corner.

 

At the time I think I had the vacuum pipe connected, but I didn't have the two tanks in place. So I installed them and it's been fine ever since. Someone did suggest that maybe the one-way valve was damaged or perhaps even installed the wrong way round, but I didn't check all that stuff before I installed the tanks.

Thanks Andy, I see what you mean now. I think the only way this could happen is if either the valve was leaking or there was a leak in the pipe between it and the clutch servo. Think I'll try and get a tank.

Well my clutch doesn't push back at me but you're right on the breaking and de-clutching.. it does get heavier. I don't mind this though... so I'll be leaving it as is!

 

Thanks for the advice all!!!! and sorry for the slight thread hijacking!