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JonnyCash 11-15-2011 07:56 PM

Handlebar mounted MC w/ ATE front end
I keep chiming in on other people's "my ATE brakes suck" threads about what a great improvement the handlebar mounted MC has been. A few people have asked what I did to implement it, so here we go. I used a 13mm Magura MC, which I bought from Economy Cycle, where I get all my parts for my RD350. It cost about $110 and I like the look of it, though someday I'll get a more attractive pinch bolt for it. I had an extra lever perch/ throttle and chopped off the lever perch portion of it. The middle picture shows the least flattering angle of the surgery, but in real life you'd never notice what had happened. With this removed, the /5 style throttle and the new MC nestled together as if it were meant to be, and all that remained was to come up with a brake line to make it all go together. I ended up using a put-it-together yourself brake line out of parts offered by Goodridge. BMW uses what I think is called an inverted bubble flare, which I found unavailable in Goodridge's line of fittings, so I had a local garage make a new hard line( the one that goes from the caliper up to the top of the fork slider) with a BMW style inverted bubble on the caliper end, and an inverted conventional flare on the other to mate with the end of the new braided line. It was a real frustrating pain in the ass involving a lot of running around, but I live in an area very poor in speed shops and the like. I imagine that if that were not the case, I could have easily had something made up to suit. Anyhow the results were worth the trouble, as the brakes are much better than before. I wouldn't say that they are up to the best that modern bikes have to offer, but their limits are better than mine. In normal stops, two fingers are plenty, and the feel is good. I think all told, I spent $160 or so. I hope this will help someone else. I'd think that if you wanted to do this on a dual-disk front end, you might want to get a MC with a bigger piston, I think the stock one is 16 or 17mm. I feel that it's a good thing to go a small step down in piston size, as it makes the braking action happen over a longer range of lever travel, giving lower effort and better modulation. Now get to work everyone!

wirewrkr 11-15-2011 09:56 PM

Super clean, Mike.

craydds 11-16-2011 08:38 AM

Very good job. I may try that on my '74 R90/6 that my son and I are starting to restore; it's going to be my son's bike. My '75 R90S has different switches and I think they make a master cylinder that bolts right on. Thanks for your information.

Caddy82rats 11-16-2011 10:58 AM

Clever idea !
I've done the same setup with a MV F4 MC, back in days (19mm). Too hard feeling on brake lever
I've tried also a CBR 900 (16mm), ideal feeling on brake lever.
Magura 13mm (BMW) give me aproximativly the same feeling as the 900 CBR in 16mm

knary 11-16-2011 06:30 PM

I'm sorry, that's entirely too simple and direct. Are you sure you own an airhead? :lol3


craydds 11-18-2011 06:41 PM

When I get into with the '74 R90/6 make-over, I will bug you for intricate details.

twostroke312 12-07-2011 09:43 PM

This is JUST what I was looking for! This will definitely help me - thanks! Let's see how difficult it will be to put together a line...

wirewrkr 12-07-2011 09:44 PM


Originally Posted by twostroke312 (Post 17470924)
This is JUST what I was looking for! This will definitely help me - thanks! Let's see how difficult it will be to put together a line...

Talk to BMWRENCH (inmate) about the line. His company makes them.

supershaft 12-08-2011 11:07 AM

That's the brand of fittings that I have never seen anyone not use: Goodridge. From what I have noticed, every brake line brand out there uses Goodridge fittings. I don't understand what fitting Goodridge doesn't make JC? I have never come across anything BMW specific while making brake lines for BMW. I have always got them through Earls and they have always had everything I needed.

lemieuxmc 12-08-2011 11:24 AM

I'm interested in converting the under-tank mc. I want it to look the same, just work better. Anyone done this?

rpt 12-08-2011 11:54 AM

Use a master cyl from a later R100 fits works and looks factory

JLeather 12-08-2011 12:26 PM

I have an earle's fork that's been modified for a Honda CB750 disc-brake front wheel I was thinking of running on my VW conversion bike (just too darn heavy for the stock brake /2 front brake, which wasn't great to begin with). I imagine the /2 throttle is fairly similar? I was wondering how I could get an m/c on the bars without having to change throttle housings.

twostroke312 12-10-2011 08:56 PM

Is that a 90 degree bend fitting I see at the banjo bolt?

twostroke312 12-20-2011 10:25 PM

I had to take this brilliant idea and copy it. The difference in braking is superb, as jonnycash mentioned. My 14MM factory MC + SS line will be up for sale if anyone is interested. Oh and a big thanks to BMWRENCH for helping me with the brake line setup.

Hawk Medicine 12-20-2011 11:26 PM


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