05 R1 - Front Brake problems

kneedown
12-27-2006, 12:09 AM
I am having some problems with my front brakes and I'm hoping someone can help me diagnose the problem. Had a race track crash on my 05 R1. Went down on the right side and bent the front brake lever. The crash may have jammed the brake on hard as the bike went down. After checking the brake system for leaks (none present. no loss of fluid from reservoir either) and replacing the lever I re-fitted the brakes on the bike and bled the lines. A bit of air came out of all the bleed nipples but now the fluid is bleeding clear. The problem I am having is that the brakes are not releasing pressure. If I bleed the lines the brakes feel fine but after pumping the lever a few times with all the nipples locked, after starting off normal, the brake lever ends up with very little movement and it feels like the master cylinder is not releasing the hydraulic pressure in the lines. So the brakes would in fact be dragging on the disc. What could be the problem? How do I fix this? Brake Lines: HEL Stainless Brake Pads: OEM (~50% wear) Master Cylinder: OEM Brembo Brake Fluid: Motul RBF600 DOT5.1 Cheers

kangaroo
12-27-2006, 06:21 PM
something either in the master cylinder or the calipers is damaged. if you have a spare master, I'd swap out to locate problem area.

zwp
12-27-2006, 10:47 PM
something either in the master cylinder or the calipers is damaged. if you have a spare master, I'd swap out to locate problem area. I agree. Without seeing it of course I can't say for sure, but it seems that the master cylinder is jacked up and not releasing pressure.

kangaroo
12-27-2006, 11:02 PM
look at the blowup. Might need a cylinder rebuild with new parts.

LDHR1
12-28-2006, 06:30 PM
wrong brake lever will do it too.

kneedown
12-30-2006, 08:14 AM
Thanks for the replies guys. Have pretty much figured it is the master cylinder and have got a friend stripping it to have a look. The lever is definitely the right one.

bender
12-30-2006, 05:54 PM
Thanks for the replies guys. Have pretty much figured it is the master cylinder and have got a friend stripping it to have a look. The lever is definitely the right one. Is the lever a Genuine Yamaha Lever or a aftermarket unit?