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Is it normal to have some hydraulic fluid in the boot area
or is that evidence of a small leak from an impending failure of the o-ring on the piston of the master cylinder?
Rear master cylinder on my 90 K75 has been leaking a small amount for the last couple of years. I add a little Dot 4 couple times a year. Bought the rebuild kit last year but have been putting off doing it. The K75 has been moved to 2 Nd. place after buying a used 08 F800ST 2 years ago. K75 has about 153,000 miles on it but only got about 2,000 miles last year. Trying to decide if it's worth doing the rebuild or if when i tear it down I
will find the bore all pitted and i will have wasted my time & the $75 price of the Kit. Has any one had any
luck rebuilding one??
Bill
Given how easy it is to open the cylinder it might have been a good idea to look at it before buying the kit.
No amount of leakage in a brake system is acceptable to me. I never had the luxury to see if that little "wetness' would stop. I was working on valued customers machines. I couldn't gamble.So what is the acceptable amount of leakage on YOUR BIKE?
How does that compare with BMW's recommendation?
What would be the result of a failure on that particular system?
A leak is a warning. Will you heed it?
New brake seals in undamaged bores do not leak, even in cold weather. Worn or damaged seals or bores do.
"Lee, re-read my post above again, this time slowly.