Brake master and clutch master cylinders

mrtask

mrtask

Well-Known Member
Different part numbers in my workshop manual, but they look the same to my untrained eye!?!? GMC307 and 578994 respectively. Are the rods a different length? I found what I think is a used brake master in my spares, I'm wondering if I can use it as a clutch master for my forthcoming manual swap? Just the addition of 578729 Clevis lever and hey presto? Or am I missing a trick here?
Should've snapped a photo. It looks as if it has been opened once before, probably to fit a new seal, anyway it does't look round anymore and doesn't want to fit into the bracket 578625... The part that has been butchered with a screwdriver doesn't have it's own number in the diagram, I don't know what to call it. If the cylinder could be tightened to the bracket it wouldn't be visible anymore, but it doesn't want to fit... Check out http://www.rover-classics.co.uk/ima...brakes/gallery/pages/Master Cylinders_jpg.htm
Thoughts, guys? Is the bit I've tried to descibe available with a rebuild kit, and can I in fact repurpose a brake master cylinder to become a vertically mounted clutch master?
 
The pushrods on brake and clutch M/Cyls on the 3500S are totally different from each other. TBH I think that if they were interchangeable just by changing the pushrod, Rover would have done it to save money. It may be that they look similar, but the bore sizes are different. If you're buying a job lot of parts (Re: Your other post) I'd add a clutch master to the list.
 
Anybody know the bore size for the clutch master please? That would make locating a kit a lot easier! New units are a bit thin on the ground down here.
thanks
 
Hi, IIRC there's a valve on the end of the piston that's different to each cylinder purpose. I think it's to do with the way the pressure is released or not on lifting the foot.

Colin
 
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