Question about 1976 BMW R 75-7

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BMW R75/7 brake question

Hello everyone, I recently joined the site to buy a 1977 bmw r75/7 off of another advrider, sourkraut who is a cool guy, so now the project begins. First order of business is changing the front brake setup to a handlebar master cylinder with a steel line and new pads. Rebuilding the caliper also. I like the tokiko caliper conversion but i would prefer to keep the original look as much as i can. From what i read about these models i was expecting the brakes to pretty much not work at all but so far in my 2 days of ownership ive found the bike rides and stops just as good, if not better, than my uncles 2006 hd low rider. It also looks cooler than the hd. I was looking through the magura catalog and i'm not sure what model master cylinder to get or if i should get a new one or find something used. i am wondering if anyone has done this conversion and could tell me about thier results and point me in the right direction as far as parts. any help would be greatly appreciated. I also plan on changing to clubman bars.

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I have actually done the conversion and the best thing you can do is fit the smallest mastercylinder you can find - my guru would only fit 11mm m/c s to with ATE calipers . The best pads I found were the EBCs. Most good brake shops will be able to sleeve your existing cylinder down. Forget any piffle you may read about spongy levers and long travel- it just doesnt happen if you have the ability to bleed the brakes. The problem with going away from the BMW m/c is the switchgear and throttle - if you fit another MC you will need new switchgear , twistgrip and cables. It takes major engineering or a brave bodge to fit a different caliper to the ATE fork legs , as the mounting system is unique. The forks from most BMWs interchange , including from the K bikes , but spoked wheels which work with the later and better twin Brembos are scarce and exspensive. I have a pair of Showa forks with twin Brembos off a late K which cost $ 200- on ebay including the wheel , guard and a near new tire. Problem is it is an alloy wheel and the only person I cAn find with a spoked wheel to fit wants $600- for it. And I am not ready to put alloy wheels on my R75/7 just yet.

Posted on Nov 20, 2008

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Why change the master cylinder, is there something wrong with it? I have an extra one if there is otherwize make sure the cable from the lever on the bar is not flexing and change to braided line to the caliper and most importantl is the set up of the caliper, use the excentric adjuster behind the black plug under the caliper to center the pads for optimun contact. Set up correctly if everything is in top shape the brake should work fine, if you are still disapointed then you can look for another lower fork, caliper,rotor and dual disc master cylinder and have a twin brake set up and still have a stock BMW.

Posted on Dec 01, 2008

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