Master Cylinder

Mini Technical Sections Problems, Questions and Technical
1

I have a yellow band master cylinder , does the brake pipe with the larger “nut” go to the front or rear brakes

2

Taken from the Mini Spares website:

The later master cylinder (GMC227 - supplied as a replacement for the early types and requires a conversion pipe kit, sometimes identifiable by a yellow plastic band around the cylinder body) has metric threaded fittings with nuts of two different sizes - top one bigger than the bottom one. The conversion pipe kit is necessary because the piston functions (and therefore the port supply ones too) are reversed. The upper/top port feeds the front brakes, the lower/bottom one feeding the rear brakes.

http://www.minispares.com/Articles.aspx?ty=ad&aid=129

3

thanks for that

4

hi there

bit confused now !

just looked at my master cylinder and the top outlet is the small one and the bottom one

is the big one ! so which should go to where?

thanks

rob

5

Good point, mine has the larger union on the bottom too. But all the yellow tag master cylinders i’ve come across have the top port feeding the front brakes and the bottom port to feed the rear brakes. With the exception of one clubman where it’d been plumbed the wrong way around by a previous owner and the rear brakes locked up and the fronts were very vague.

6

Thanks for that , any ideas why the rear brakes would start to lock up ?
I have not changed anything on the braking system.