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Old 28th January 2015, 21:22
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Quote:
Originally Posted by 8 Valve Ed View Post
I have a little puzzle, my brake master cylinder is from a BMW, I don't know which, although I think I was told once...

I have started to pipe up the brakes and the old chestnut of which port goes where arrises once again. It would have been very convenient if the front brakes were connected to the back part of the master cylinder because that has two ports, and the back circuit to the single port at the front of the master cylinder.

However, given the rear outlets are marked 20 (mm?) and the front outlet is marked 19 (mm?) I am assuming the front outlet should go to the front brakes via a 'T' piece and the rear outlet with one outlet port blanked off, to the back brakes. That assumption because usually you need a greater pressure to the front brakes, the back brakes just assisting, also you don't want the back brakes locking up well before the fronts have started to bite.

I have made a photo of the m/c; beside the 19 and 20 markings there is a letter, my query relates to the letter, does it indicate H and V to indicate F and R (front and rear)?

Also, can anybody explain why there are two outlet ports on the outlet marked 20?

Any suggestions will be appreciated, while I could look a word up, H and V are difficult to look up! ...Just thought, perhaps I just look up Front and Back in German?

Anyway, any suggestions still appreciated.



Ordered the gaskets for the engine today, may start assembling that tomorrow.
That looks like the BMW master cylinder that came off my BMW 320i donor car. The two ports nearest the pedal pushrod are for the front disc brakes. The single port is for the rear brakes which were drums on the 320i. The rear brakes also have a pressure reducing valve (BMW part number 34331152494) between the M/C and the tee piece in the rear brake line.

You can see it here fitted in my Marlin Sportster.....

Brake line sand fuel lines by marlinpeter, on Flickr

Sorry that this old photo is a bit blurry. You should be able to get the pressure reducing valve from any scrap e30 BMW if you need one.

I hope that helps?

...peter
P.S. i don't know what the letters stand for
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