I need help with my brakes - MINI Cooper Forum

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post #1 of 5 (permalink) Old Jun 24th, 2014, 12:32 PM Thread Starter
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I need help with my brakes

I have done the conversion from drum to disc brakes on a 1000cc 1976 Mini right hand drive with 10 inch wheels. Bled the lines so only clear fluid is coming out. And yet I need to pump the brakes at least once to get enough pressure to stop and even then its not great. I expected a whole lot more stopping power. A guy at work suggested replacing the master cylinder but I don't want to just go randomly replacing things. Any suggestions would be very helpful. Thanks
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post #2 of 5 (permalink) Old Jun 24th, 2014, 12:44 PM
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Hi ya

It does sound like the master cylinder, when the car is stationary if you pump the brake and keep pressure on it does it start to fad if it does there is a good chance it's the master cylinder, it is possible to have a internal leak as well.
From what I remember the cars that had discs had a different master cylinder bigger internals. The 1275 GT used to have had a brake servo as well

Hope this helps
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post #3 of 5 (permalink) Old Jun 24th, 2014, 07:10 PM
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You will probably need a bigger bore master cylinder if youve gone from drum to discs on a standard mini, you are having to pump the pedal to bring the pads back up to the discs as they move away a little during wheel movement then the second press is to press the pads onto the discs, if you had a larger cylinder more fluid would be pushed through in one press of the pedal.
You need to check what cylinder you have fitted at present and then see what cylinder the mini that had 10" wheels with discs had and do the same, the betting is its a larger one than you have already and maybe even had a servo too??

This is the forum for the BMW MINI by the way, you might be better going onto a classic mini forum to get your questions answered?
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post #4 of 5 (permalink) Old Jun 25th, 2014, 01:05 AM Thread Starter
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Awesome thanks guys. I'll look into it.
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post #5 of 5 (permalink) Old Jun 25th, 2014, 10:45 PM
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Yes you need to fit the Cooper S/1275GT master cylinder, looks the same as the drum version but is visibly taller for extra fluid capacity (used with the single circuit brakes) and had a remote servo.

If you have the later dual circuit brakes then you need to fit the 1989 onwards master cylinder and servo unit combined, used for all later Mini's with disc brakes.
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