Question about 2004 Yamaha YZ 450 F
I don' t think by saying "cracking the lines open to get all the fluid out" he meant he literally broke the line. You probably have a bad cup in the master cylinder and it needs a piston rebuild kit. This is most likely the case if there has been no external leakage at all. Old gelled up fluid can cause this so flushing and bleeding could possibly help. Dot 3 and 4 are interchangeable they just have different test standards for temperature, etc. You definitely got a load of air in the system and it can be very difficult to get out. Forget the rear bleed nipple on the caliper for now. It is useless and only for final bleeding after you have pressure built up. Press the caliper piston all the way in while watching the reservoir on the master cylinder(don't let it overflow). Then do normal bleeding, pump and hold, starting at the brake line banjo bolt. Break it loose and re-tighten it just like it was a bleed nipple. Make sure to never let the reservoir level get to the bottom. Work your way to the brakeline banjo bolt on the caliper, pump and bleed. Final bleed at the nipple. If bleeding doesn't last - rebuild the master.
Posted on Feb 16, 2010
Did you replace the cracked line, otherwise you're leaking in the caliper, or pedal diaphram has gone bad.
Posted on Feb 03, 2010
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Posted on Jan 02, 2017
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