I had my rear brake master piston seize. lucky only a mile from house so turned around rode home with brake dragging. Ordered a knockoff master but it fits and bore measures the same. Bled the brakes till absolutely no air, rechecked several times no air. I cannot get rear to lock up, they do slow me down. Master will move full stoke. No discoloration on rotor. Did i get a bum master or did i glaze pads/rotor or am i missing something?
weak rear brakes
- Thread starter busaboost
- Start date
Glazed pads and rotor sounds about right.
Berlin Germany
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@busaboost
what y.o.c. are we talking about?
gen 1 or 2 ?
for gen1 i would suppose the caliper needs a deep cleaning what means to put it into its pieces and clean inside.
comparable to the front calipers at this page.
i did this job at the rear 2 days ago and the inside looked similar to the 2nd negative example at the page (link) above.
what y.o.c. are we talking about?
gen 1 or 2 ?
for gen1 i would suppose the caliper needs a deep cleaning what means to put it into its pieces and clean inside.
comparable to the front calipers at this page.
i did this job at the rear 2 days ago and the inside looked similar to the 2nd negative example at the page (link) above.
Even if it was a short distance that u knew it was seized and the brakes were dragging they had probably been doing some kind of dragging for awhile just not quite as bad. Either way after a mile of driving with the brakes engaged at minimum the pads need replaced. Got any pics of the rotor and maybe the pads? Its also possible if they had been slightly dragging for awhile without u noticing your caliper could have heated up and need some attending as well.
That's kind of what I was figuring, like the boys said some new pads check that rotor and rebuild that caliper cause everything was definitely hot.
Kiwi Rider
Registered
The pads are cooked.
The caliper needs a rebuild and new fluid ASAP.
Nothing to see here . . move along please.
The caliper needs a rebuild and new fluid ASAP.
Nothing to see here . . move along please.
Kiwi Rider
Registered
I've never heard of a master cylinder piston seizing while in use.
I've seen plenty of seized M/cyls seized from sitting for years but none from use . . strange . . did you strip it to check the internals?
Had the bike been sitting a long while perhaps?
202mphbusa
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Hayabusas have rear brakes?
SSGT_B
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Right!!!!!! Lol
michael parris heuberger
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Hi When I raced F 5000 an when I
michael parris heuberger
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Hi hit wrong key. Like I was saying when I was racing F 5000, when I was doing slow lap times people told me to go faster to REMOVE the brake pedal.
202mphbusa
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not to jack the thread
Loring in 2015 Harvest event
about 3/4 mile out bike nosed over, I thought F I hurt the motor, chop throttle and bike comes screaming to a halt , on the runway. BIG HUGE clouds of smoke off the front wheel
my rotors were glowing red
pop bike in gear and magically the bike rolls, so I get back to the pits
rotor or rotors must have been dragging
now the fluid has been boiled in the line lever comes back to the bar and nothing
So I bleed the brakes, but now I apply them the rotors bind again
Track official happens to be going by me pits. and starts chatting
askes the problem, he says and I quote "Pull the F'ers off, you of all people know you don't need them up here"
Loring in 2015 Harvest event
about 3/4 mile out bike nosed over, I thought F I hurt the motor, chop throttle and bike comes screaming to a halt , on the runway. BIG HUGE clouds of smoke off the front wheel
my rotors were glowing red
pop bike in gear and magically the bike rolls, so I get back to the pits
rotor or rotors must have been dragging
now the fluid has been boiled in the line lever comes back to the bar and nothing
So I bleed the brakes, but now I apply them the rotors bind again
Track official happens to be going by me pits. and starts chatting
askes the problem, he says and I quote "Pull the F'ers off, you of all people know you don't need them up here"
michael parris heuberger
Registered
Hi That is another great story! It is amazing of what can go wrong with out warning. In F 5000 I was going into a long right hand turn, and I see a rear lone tire going by me! CRAP it was mine!
