Greetings all. First post and first month on my first trials. Yay me.

Anyway, bike is a 1996 Techno 250 (with 270? upgrade kit). My rear brakes have no braking power. I have the original caliper and rotor, but installed on the bike is an aluminum 4 pot Galfer and wave rotor. The fluid reservoir was dry and I found out why. The master cyl needed rebuilding.

I ordered from Lewisport and the wrong size came in. Actually, it was the right size, but apparently someone had upgraded the M/C to a larger 13mm piston style. Adrian hooked me up with the right one. Anyway, got the brakes all connected and bled. On the bike stand, the rear wheel will stop great with the brake pedal applied. When riding the bike, its very "woody" feeling and won't actually stop the bike hardly at all. I've bled the crap out of it and still no real stopping power.

I'm curious what to try next. Is the larger 13mm piston M/C better for the 4 pot galfer? Should I try replacing the pads next? I did scuff them up with 60 grit...

Thanks,

Steve

sounds like a brake pad issue, you have a solid feel when you press the pedal? or soft & mushy? the pads may be glazed over or not the right compound, I had a '96 Techno the brakes were finicky to set up but did work good with the stock componets

fairly solid feel. doesn't feel like air in the line

iv'e deglazed the pads, though.......

Gday, a 13mm Mastercylinder on the rear is probably a bit too big. Hydraulics work like gearing - a big "driver" (front sprocket, master cylinder) moves a lot of distance but doesn't produce much power. A smaller one gives power but not as much movement. I think most trials rear m/cyls are 10mm or less in diameter. Same at the other "driven" end - small pistons or rear sprocket gives lots of movement but not power and vice versa. If the pedal is firm (not spongy) there is no air present so this seems the logical cause to me.

Cheers,

Stork

I would try a new set of pads before any thing else.