ive a friend whose rear master cylinder has gone and he went to get a replacment pistonkit and they say there is not one available and he has to buy a complete unit €130 !(which he ordered but will take a week ) his bike is a tm 300 e which are hand built so i can only guess that the same nissin part is used on other bikes -is there any way to find this out ? it has 1/2 on the outside of the master cylinder and an external resevoir
the problem seems to be when the piston is being pushed up(when braking) it sticks and doesnt spring back down ,i think the top rubber is flipping on the way in and sticking .is there any quick fixes for this ?
i know this isnt crf related but he is like a demon trying to get out for the weekend so i said id see what i could do
thanks