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Old 07-14-2014, 10:10 AM   #1
2strokemonster OP
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r60/7 brake master/caliper

Hey guys: I posted a brake question a while back, new issues.

So I replaced the pads, and the squealing stopped but the brakes just aren't adequate. The lever pull is WAYYYYY too stiff and not very good on hydraulic advantage. I wanted to just replace the master cylinder, but it turns out they are 350-400 dollars. That is absolutely absurd.

Soooo, I was thinking I should get a master rebuild kit. And while I'm at it I might as well do the caliper too. Does anyone have a preferred supplier for these parts?
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Old 07-14-2014, 10:11 AM   #2
Boon Booni
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Originally Posted by 2strokemonster View Post
Hey guys: I posted a brake question a while back, new issues.

So I replaced the pads, and the squealing stopped but the brakes just aren't adequate. The lever pull is WAYYYYY too stiff and not very good on hydraulic advantage. I wanted to just replace the master cylinder, but it turns out they are 350-400 dollars. That is absolutely absurd.

Soooo, I was thinking I should get a master rebuild kit. And while I'm at it I might as well do the caliper too. Does anyone have a preferred supplier for these parts?
I don't think a rebuild is going to change the lever feel. A smaller diameter master cylinder, or larger diameter calipers will make the lever softer.

Do you have the 38 or 40mm calipers?
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Old 07-14-2014, 01:22 PM   #3
chasbmw
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You want a smaller master cylinder, just a rebuild kit won't change the feel.

If you had twin discs, I would suggest a 13mm MC, which can be found second hand for the later airheads, I'm not sure what size to recommend for a single disc, maybe 11/12mm, check if anyone sleeves down master cylinders or check Magura master cylinders, but the electrical controls won't match.
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Old 07-14-2014, 08:09 PM   #4
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I dont know the other post/thread or where you started. But I recently (finally) went through my MC. Got the pivot cleaned up/greased. Honed the bore with some REALLY fine grain sand paper and a wood dowel, New seals, etc. It REALLY changed the feel of the front brake. YMMV, and its still not as easy as a modern brake, but def needs to be done if its old and nasty.
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Old 07-15-2014, 10:51 PM   #5
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is the caliper adjusted?

At the risk of stating the obvious, did you scrupulously adjust the caliper so that sharpie marks are erased equally and evenly on both sides of the rotor? This is really important for that caliper design. The caliper is marginal at best, but you can get that margin closer to barely adequate with a good adjustment and modern compound pads (I think Northwoods AIrheads and others sell them).
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