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Brake Fluid Leak Behind Master Cylinder

Marko R1
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Marko R1 Grand Master

Marko R1

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Hi guys,

I've noticed a small leak under the bonnet due to the wet patch on my garage floor.

I can see a run down the face of the black vacuum cylinder right underneath where the master cylinder is mounted...what is the fix for this? Is there a brake seal kit or do I need to replace vacuum cylinder?

GTSBoy Grand Master

GTSBoy

Posted
Posted

Master cylinder either needs a kit put through it or outright replacement. If kitting it, take it off, take it to brake shop, get them to put a stainless sleeve in it and run the kit through it. Will be more successful than slapping a kit into an old rotten piston bore.

GTSBoy Grand Master

GTSBoy

Posted
Posted

The black thingo is called the "booster". Commonly called the brake booster or the master booster. It is a vacuum cylinder by function, just not by name.

As to Sydney brake shops...I have no idea. In Adelaide I would take it to Power Brakes (if I didn't have a bro-in-law who was a mechanic and so in reality what I would actually do is take it there and get him to organise the M/C being kitted). Hopefully you'll get a tip from a Sydneysider. Or you could scout around for a brake specialist in Sydney who has been in business for 50 years (like Power Brakes have in Adelaide) and use them on the basis that they must know what they're doing to still be in business!

Duncan Grand Master

Duncan

Posted
Posted

Beware. You only need the BM57 if you need a bigger cylinder. Generally because of much bigger caliper volume. Do some reading on what happens to pedal pressures and travel when changing MC and/or caliper piston sizes before acting on that impulse!

Exactly, you don't want to change the master cylinder size unless you are looking for a different result....just relace or rebuild the standard one.

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