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Old 10-14-2005, 04:25 PM   #1
bikejunkie OP
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Joined: Jul 2005
Oddometer: 52
brake line leak

I have a leak at the front brake resv. on an 88 GS. I have determined that it is at the 'crush' washer closest to the resv. I cannot see a hairline crack in the resv. neck. I have replaced both washers with new ones and my local mechanic says to tighten til the leak stops. Did that and still a leak, tighten more...still leaks. I now fear I have stripped the bleed bolt, can this happen or is there still room to tighten? Replace the washers again? Anyone recommend something, aluminum, copper?
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Old 10-14-2005, 11:40 PM   #2
sharkey
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Location: Melbourne, Australia
Oddometer: 875
Quote:
Originally Posted by bikejunkie
I have a leak at the front brake resv. on an 88 GS. I have determined that it is at the 'crush' washer closest to the resv. I cannot see a hairline crack in the resv. neck. I have replaced both washers with new ones and my local mechanic says to tighten til the leak stops.
Get new, genuine BMW/Brembo crush washers and a new mechanic.

Clean the mating surfaces thoroughly with brake cleaner, wet them
with brake fluid then assemble. Not sure of the exact torque for these bolts, but it isn't very much. Don't turn the banjo once it's assembled ...

I tried twice to put mine together with Honda crush washers which were the same ID but a slightly different OD ... and it leaked no matter what I tried. Coughed up for the genuine ones, and it worked first time.

You don't want to overtighten the banjo bolts or, as you say, you'll mangle the threads in the MC, which is going to be very expensive.

-----sharks

sharkey screwed with this post 10-14-2005 at 11:49 PM
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Old 10-15-2005, 10:44 AM   #3
bikejunkie OP
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Sharks,
You nailed it! I used Honda washers like you and it never cured it and the mechanic's advice.....yep, stripped out the M/C (place colorful metaphor here). Heli-coiling an option or replacement of the M/C? In fairness to the mechanic's advice the threads I suspect were screwed a little when the PO got into a minor accident and the banjo got yanked out a little, I figured it was no biggie and thought a washer replacement was all that was needed as it didn't need much of a tighted to spin the bolt (threads and all). So I am on the look for good used master cylinder. (place another colorful metaphor here). Anybody got?
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Old 10-15-2005, 11:21 AM   #4
Ron Seida
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Thumb

I have a 13mm fron an '89 PD. PM me...
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Old 10-15-2005, 04:14 PM   #5
sharkey
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Quote:
Originally Posted by bikejunkie
Sharks,
You nailed it! I used Honda washers like you and it never cured it and the mechanic's advice.....yep, stripped out the M/C (place colorful metaphor here)
Bugger! It may be possible to helicoil, but for something as
critical as a MC banjo, I'd be trying to find a replacement.

Glad I could help a bit ... the BMW/Brembo washers aren't
expensive, so buy a few extra ones and keep some in your
roadside repair kit in case you rotate a banjo too!

-----sharks
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