PASO
Guest
2 days to go until i leave for sweden and norway and i find a weep from the master cylinder on my R1100GS looks like a simple seal change is it ? 
PASO said:2 days to go until i leave for sweden and norway and i find a weep from the master cylinder on my R1100GS looks like a simple seal change is it ?
very simple. Buy a new brake piston (it comes with new seals fitted)
take the mastercylinder lever plastic cover off, undo and remove the brake lever. Undo the small grub/locking screw and remove the brake piston. And revrse the sequence to put it all back, bleed the brakes.
Make sure you put the new piston in the right way around, or you'll never be able to bleed the brakes (don't ask how i know)
Hours work from start to finish
PASO
Guest
Thank you 
PANIC nearly over 
do most BM dealers stock them ? going to bristol tomorrow Bath road m/c here i come 
PANIC nearly over do most BM dealers stock them ? going to bristol tomorrow Bath road m/c here i come 
charlie b
Registered user
Steptoe said:very simple. Buy a new brake piston (it comes with new seals fitted)
Make sure you put the new piston in the right way around, or you'll never be able to bleed the brakes (don't ask how i know)
How do you know that Neil..????
PASO said:: do most BM dealers stock them ? going to bristol tomorrow Bath road m/c here i come
You'll be lucky if they have one in stock - James Sherlock has them in ready to go.
PASO
Guest
Right do you have phone no for james and where is he please ?
PASO
Guest
AH found it thank you
charlie b said:How do you know that Neil..????
SShhhhhhhhh !!
PASO
Guest
Thanks to steptoes suggestion and james sherlock we are rocking again thanks chaps
PASO said:Thanks to steptoes suggestion and james sherlock we are rocking again thanks chaps
Just on that subject, I was in Germany and the same happened to me.The
barrel was very badly pitted, if I'd put in new seals they wouldnt have lasted
long, BM had since redesigned it so they are no longer annodised aluminium, new master cylinder €250.00 from main dealer in Germany.
I was told this was a more common fault than I would have thought.
Daithi said:Just on that subject, I was in Germany and the same happened to me.The
barrel was very badly pitted,
I was told this was a more common fault than I would have thought.
Pitting is usually caused by not changing the brake fluid when scheduled.
They can also leak on lowish mileage bikes that don't get used very often just after bleeding, when the piston moves along the cylinder and the seal travels more than it does in every day use, and the seals turn slightly.
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