front brake stuck on !

[skidlydog]

Hi All, 1200 gs brake is stuck on and can only release after loosening the bleed nipple by the master cylinder .after a few pumps its locked back on again ? any thoughts folks

[JonnyBravo]

No idea old chap but you would do better to ask here -

http://www.ukgser.com/forums/forumdispl ... GS-Hexhead

they are the font of knowledge for all things panzer

good luck (thumbs)

[sprintster]

.

[Dutchgit]

Did you change pads recently ? There might be too much fluid in the master cilinder reservoir.

Or the plunger in the master cilinder doesn't come back all the way. Is there free play in the lever ?

[big al]

+1 with Dutchgit. Does it have servo brakes?

[onslowe]

The tiny hole in the master cylinder that allows the fluid to return may be blocked worth checking and a pin could be used to open it up again.

[catcitrus]

The nasty little diaphragm washer should allow the pressure to release once you let go of the lever. Suggest that you try a bleed and "flick" the brake lever a few times--it may clear--if not its piston strip at the handlebar end --but if its ABS with all that servo sh1t then it could be anywhere in the system.

[robson]

sounds kinda dangerous, can it happen while moving?

[Big Yellow Tractor]

Does it happen after some heavy braking ? How old is the brake fluid ?