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Brake Master Cylinder

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Chris_911

New member
I've discovered as part of my brake re-fresh that my master cylinder is leaking, and so need to buy another.

My question - what does the new master cylinder come supplied with in the way of new seals, etc. Basically, what else do I need to buy beyond the replacement master cylinder?

Managed to break the fluid reservoir whilst removing one of the hoses, but I think this is possibly a blessing in disguise.

Thanks.
 

ORIGINAL: Chris_911

I've discovered as part of my brake re-fresh that my master cylinder is leaking, and so need to buy another.

My question - what does the new master cylinder come supplied with in the way of new seals, etc. Basically, what else do I need to buy beyond the replacement master cylinder?

Managed to break the fluid reservoir whilst removing one of the hoses, but I think this is possibly a blessing in disguise.

Thanks.
Click to expand...
Chris,
Not that I've ever bought one, but I image the master cylinder comes just as is suggests. ie the cylinder complete with new seals and pressure tested, the reservior is seperate I suspect. I'd try one of the breakers for that as I image Porsche with relieve you of a pretty few of the folding variety for one!
I suppose in answer, if its just your master cylinder that's leaking, that's all you need.

Cheers,
 
OK - parts now on order from my local OPC (price OK, lower than some of the independent parts specialists).

Should the cylinder be 'primed' in any way before re-fitting to car?

I'm assuming that this is not the case and that the brake and clutch just need to bled completely.
 
Oh yes - meant to add - am I glad that I am using synthetic fluid.

This does not damage the paint. I hate to think of the mess with mineral fluid.
 
I would counsel anyone in the market to buy new - as Chris has. They are not too expensive and any second hand one is likely to have the same failings that your old one has. The problem is corrosion that can then damage the seals, particularly when bleeding the brakes using the old pumping the pedal method which involves more travel than the cylinder is usually expected to deal with.
 
Hi Richard

Yes, sage advice I think re buying new. Even from my OPC the parts are not what I woudl consider expensive. At the end of my brakes project I will have an almost completely new braking system, good for many years I hope. I don't think I would save that much by searching hard for used equipment and the fact that I am doing the work myself and hence have no labour costs more than offsets this.

I just get frustrated when I find a problem and can't immediately get the new parts to fix it!

Also, I won't compromise on a safety area, such as teh brakes.

Just my 2p.
 
Just to round this thread off (might be of help to others), I bought a new master cylinder from Porsche. It actually came with the end 'o' ring seal and the rubber seals for the two fluid inlets - i.e. it is complete.

I ordered these separately but need not have bothered.
 
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