BMW K bikes (Bricks)

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1Back to top Go down   Sticky handbrake Empty Sticky handbrake Mon Jul 13, 2020 7:57 pm

ldescloi

ldescloi
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My handbrake got "sticky" over time, meaning that the brake lever wouldn't get all the way back to its resting position upon release and I had to push it ever so slightly with the back of my fingers after each squeeze. 

Two separate BMW technicians diagnosed a weakened master cylinder that had to be replaced eventually. I had no other symptoms such as leaking, so I was a bit skeptical. On a hunch, I disassembled the handbrake using the diagram below and, lo and behold, I discovered that the lever mounting pin was all dry and rusty. I applied a touch of lithium grease to the pin and put the break assembly back together - voilà! problem solved.
Sticky handbrake K1100l12

Some notes of caution: The instructions above are for replacing the master cylinder; you should only perform the steps highlighted in yellow to remove, lubricate, and put back the mounting pin. Don't even think of adjusting the thrust pin attached to the brake lever (slotted flat screw head sealed with red paint) as I learned the hard way Embarassed: it could cause the brake to lock up when the fluid heats up and expands. Finally, keep in mind that the mounting pin is tightly screwed in and secured with Tuflok. Make sure you use a METRIC, good-quality hex key (Allen wrench) of the right size (5 mm) because there is a a significant risk of rounding out the head as mentioned by "MT350Explorer" in this post:
https://www.k100-forum.com/t5082-changing-the-front-brake-lever-on-a-4-valve-bike#55591

If there is any sign of rounding out after removing the pin, don't hesitate to order a new one from BMW for about $20. Use a small torque wrench to tighten the pin (8 Nm or 70.8 in.lb.) - do not over tighten!



Last edited by ldescloi on Tue Jul 14, 2020 3:30 pm; edited 2 times in total


__________________________________________________
Sticky handbrake Bmw-lo10
1992 K100RS VIN 6494016
1986 K75C
    

2Back to top Go down   Sticky handbrake Empty Re: Sticky handbrake Tue Jul 14, 2020 10:49 am

92KK 84WW Olaf

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For those that don't do it, clutch and brake lever pins need lube, so too the clutch lever nipple and it needs lots of it.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

3Back to top Go down   Sticky handbrake Empty Re: Sticky handbrake Tue Jul 14, 2020 1:10 pm

ldescloi

ldescloi
New member
New member
Thank you, Olaf. The clutch is next then. As a side note, it looks like some BMW technicians are not aware of this either or do not care. It annoys me to no end when I pay top dollars for lousy service. It reminds me of what Robert Pirsig wrote about his experience with bad mechanics in Zen and the Art of Motorcycle Maintenance - dreadful!


__________________________________________________
Sticky handbrake Bmw-lo10
1992 K100RS VIN 6494016
1986 K75C
    

4Back to top Go down   Sticky handbrake Empty Re: Sticky handbrake Tue Jul 14, 2020 3:27 pm

92KK 84WW Olaf

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Life time member
Life time member
@ldescloi wrote:Thank you, Olaf. The clutch is next then. As a side note, it looks like some BMW technicians are not aware of this either or do not care. It annoys me to no end when I pay top dollars for lousy service. It reminds me of what Robert Pirsig wrote about his experience with bad mechanics in Zen and the Art of Motorcycle Maintenance - dreadful!
K bikes for a main dealer are old technology so main dealers are not the places to go to. Most techs there are born after the K bikes!!

Zen is good fun too!


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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