Leaking Rear Brake Cylinder
Posted July 23, 2012 - 02:12 PM
By the time I got home my master cylinder was dried up and no brakes. SO, being new to dirt bikes, i'm not sure what the diagnosis is.
I can tell the fluid is leaking from the bottom, i'm guessing the exposed rubber is just a dust boot not an actual fluid seal, i'd guess the actual fluid seal would be inside the housing, but it is coming from around this exposed boot..
So is the leak caused by a damaged seal, or is my lever still bent just slightly enough that it's causing mis-alignment of the "ram" or rod that goes up into the master cylinder?
I refilled with DOT4 fluid, bled out the rear brake, and sure enough it still leaks when brake is applied.
What do you guys think i should do to diagnose or repair this. Rebuild Kit for $25 online? Or do you think it's gonna be my lever. Is there a way to tell? Thanks a lot, great information on this board.
Posted July 23, 2012 - 05:13 PM
Posted July 24, 2012 - 03:04 AM
Posted July 24, 2012 - 07:53 PM
Posted July 25, 2012 - 02:22 PM
It turned out to be a really easy fix. It still leaked fluid after refilling and bleeding twice, I just used my calipers and measured the alignment on the rod going up into the cylinder, it was off by a few thousandths, i slightly bent the back side of the pedal until it was lined up really close, and then I pumped the pedal several dozen times. Filled again, bled, and it's been good for 2 days driving to work with no leaking! I hope it holds up, if not i'm guessing based on what I did it would still be slightly out of line, or a seal inside would be damaged from the bend. Good to go for now! Ride on....