08-06-16, 12:29 PM
Is there an obvious way to determine if your master cylinder needs overhaul? Aside from brake feel not improving after bleeding, assuming seals and pistons etc are good?
The feel on my rear brake is poor - it will hold the bike on a hill when stopped, but the pedal is spongy like it needs a bleed - it's no good at slow speed filtering through traffic. I've tried cleaning and lubricating the lever pivot as seen on here before. Fluid was changed recently, and I've put braided lines on and recent EBC pads. Pedal is set the correct distance below the footpeg.
One piston is very slow to come out and squeezing it out and cleaning hasn't made any difference. I've bought new seals and am planning to overhaul the caliper - hopefully before MOT on Friday - along with new slide pins. When I've finished I'll try a bleed with pistons clamped right back and caliper suspended above the master cylinder, but if that doesn't solve it would you automatically move to Master Cylinder overhaul as the next step?
The feel on my rear brake is poor - it will hold the bike on a hill when stopped, but the pedal is spongy like it needs a bleed - it's no good at slow speed filtering through traffic. I've tried cleaning and lubricating the lever pivot as seen on here before. Fluid was changed recently, and I've put braided lines on and recent EBC pads. Pedal is set the correct distance below the footpeg.
One piston is very slow to come out and squeezing it out and cleaning hasn't made any difference. I've bought new seals and am planning to overhaul the caliper - hopefully before MOT on Friday - along with new slide pins. When I've finished I'll try a bleed with pistons clamped right back and caliper suspended above the master cylinder, but if that doesn't solve it would you automatically move to Master Cylinder overhaul as the next step?
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