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brake fluid ratios an master cylinders


dan28
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my xvs had a( bodged ) rear disc setup when i bought it

due to the old setup not working very well (the pedal pulled a cable that went to the back of the bike that pulled a linkage(that flexed sideways) an moved the master cylinder arm

i decided to fit a master cylinder from a yamaha wr i mounted it through the engine mount

as the pedal is bolted directly to the linkage it will work alot better

heres a pic to explain

http://img824.imageshack.us/img824/7717/photo1831jo.jpg

the problem i have now is the master cylinder is smaller than the one desined to work with the rear caliper

the old one had number 14 on it

the one i m using now says 1/2

so i guesss this wont push enough fluid through?

so i should change the rear caliper to match the master cylinder

but this is the mount the attaches the original brake to the swing arm

http://img69.imageshack.us/img69/693/photo1836.jpg

an this is the caliper an bracket i need to use to match the master cylinder

http://img849.imageshack.us/img849/5505/kgrhqjhje0fb5z6yor8bqp6.jpg

not sure if it will be possible to modify it so it will fit to the bracket above?

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  • Moderator

there's only 1mm difference so the rear pedal will travel a bit further, but you should still have a rear brake.

have you tried it with this set-up yet or are you assuming there is a problem?

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i havent tried it yet the old master cylinder had 14 embossed on it (i assume this means 14mm

the new one says 1/2 i assume this means half inch (approx 13mm)

i noticed the old master cylinder is quite abit longer an if i mount in the new location the pedal would hit the ground (hence using a shorter one)

so i should be able to use the new master cylinder(1/2) with the old caliper intended to work on 14 master cylinder

i need to get a braided hose made upto use them but if it doesnt work chances are the hose will be the wrong angle if i fit a different caliper

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  • Moderator

Dont panic Mr Manwairing, Yamaha used 1/2" calipers for europe and 14 mm for the states on many bikes with the same calipers on the bikes, you will never notice the difference

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thanks mervin

the caliper an swing are are from a sachs xtc not that it really matters

i ll get my hose made up at weeked an hopefully it will work

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