Hoping for advice. I bought a 2016 FE 450 for trail rides with my daughter and general foolery, with very low km's / little use that had sat in a shed for 4+ years unused.
Originally, I had no rear brake. I replaced the master cylinder seals, and the rear brake now works "perfectly"... except every so often (randomly, 1 in 5-6 presses), the brake pedal will just drop to the bottom of its travel with zero hydraulic pressure.
When this happens, it will either work fine if you press it again, or sometimes 2-3 times, you have to press it. It doesn't feel like it pumps back up, but maybe....
Does this sound like an air bubble that needs more bleeding, or would I be better off doing the calliper seals as well?
I would have thought an air bubble would leave SOME hydraulic pressure, and you would feel it pump up, not zero pressure as it does randomly.
Work your way bleeding back to caliper Hold pedal dow and crack banjo fitting at master cylinder then do same to rear banjo then bleed screw
Those brakes should be low maintenance and strong.
Likely that a proper bleed will fix them.
Also, check that there are no leaks at the banjo bolts or brake hose (crash damage?).
Make sure when you bleed the rear brake the pedal doesn’t hit your stand and you are able to fully depress the pedal.
Had a bent front rotor that caused this exact problem. Does the rotor look straight when you spin the wheel ?
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Check the pedal free play.
Check that the caliper slide pins aren't sticking. If the caliper isn't free to move, or randomly sticks on the pins, it'll do exactly what you describe. I use CRC 5359 caliper grease on my pins. Never have a problem.
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