GHOSTMAN
Expert Class
Posts: 456
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posted June 14, 2012 04:59 AM
Rear Brake Seizing While Riding
Rear brake locked up on me twice while on my way home yesterday. I loosened the brake pipe nut to relieve pressure and tightened it back as a quick fix to get home. Went about ten miles, and rear brake started seizing again on it's own. After that I called a buddy and trailered it home.
I haven't looked at it yet, but would like advice on what to look for and where to start.
The bike HAS been sitting for months, and I've recently put in about 700 miles with no incident.
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SteddyTeddy
Pro
Posts: 1664
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posted June 14, 2012 05:06 AM
Start by checking your lever and make sure it isn't being held partially down. Then I would bleed the system to rule out air. Also inspect the caliper and make sure the piston moves freely and isn't seized.
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entropy
Moderator
Posts: 8671
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posted June 14, 2012 06:06 AM
change yr fluid.
I'm guessing there is water in it. water turns to steam...
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quikgix
Expert Class
Posts: 274
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posted June 14, 2012 06:12 AM
Adjust the threaded rod that actuates the master cylinder,It might be adjusted to deep in the master cylinder.
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zixxer14
Pro
Damn that was Quick
Posts: 1233
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posted June 14, 2012 06:16 AM
I'd check the brake line itself, It may be kinked or the inner line may be closed off allowing it to heat the fluid & put pressure on the caliper. It happened to mine & I replaced it with a stainless line.
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BobC
Pro
Posts: 1736
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posted June 14, 2012 06:59 AM
Entropy is probably right, it's water in the fluid. I saw this happen to a Hayabusa at an LSR meeting. His front brake seized on half way down the runway and it spat him off. When they picked the bike up it had freed off again.
Change the fluid and check the slave pistons are free to move.
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MotoCycho
Expert Class
Posts: 337
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posted June 14, 2012 08:55 AM
 Edited By: MotoCycho on 14 Jun 2012 16:57
Also check your wheel bearings and spacers. I've see what looked like the rear brake was binding at first but was actually caused by a failed bearing and a ruined cush drive & wheel. The wheel would move side to side and even wobble a bit on the bad components and cause a bind at the rotor to caliper and caliper hanger.
It's not a likely fail point.. but the bike I saw this on was a clean, seemingly well maintained machine.
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ArmyRecon19d
Novice Class
Posts: 58
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posted June 14, 2012 09:04 AM
Just take the back brake off. Fixes your problem AND it's a weight reduction.
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ArmyRecon19d
Novice Class
Posts: 58
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posted June 14, 2012 09:06 AM
But seriously... locking right up while your riding? That'll pucker your ass right up.
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GHOSTMAN
Expert Class
Posts: 456
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posted June 14, 2012 01:18 PM
quote:
But seriously... locking right up while your riding? That'll pucker your ass right up.
Uh...Yeah...LOL!
Thanks for the insight fellas!
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speedgene
Zone Head
Posts: 996
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posted June 14, 2012 01:34 PM
quote:
I loosened the brake pipe nut to relieve pressure and tightened it back as a quick fix to get home.
It is either one side or the other, meaning, caliper or master.
quote:
would like advice on what to look for and where to start.
Good question. The relief of the banjo says to me a master. The caliper can move back on its or it would be the caliper hanging there solid. It is a crap shoot, why....
quote:
The bike HAS been sitting for months, and I've recently put in about 700 miles with no incident.
... It's a sitter. That has time to grow. Everyday something rots away to nothing. You see water is king on earth. The cleaning agent to wash itself clean all the time is every second your bike is decomposing it hits moisture. Months sitting and the lowest part of the brake caliper will have water sitting there.
So between the crap shoot the goop being under the quad seal could not retract that on its own? That says to me, the piston in the brake master needs a relief hole cleaned. Something is not running atmosphere, but is under one of the pressures opposite atmosphere. So it is not vacuum or the piston has a suck-back there. Where is it? Must be pressure still pushing it. It looks to me like a master side to me. JMO.
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kawasakijockey
Pro
Posts: 1876
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posted June 14, 2012 01:53 PM
Return hole in the master cylinder is plugged. Very small hole.
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CajunBoyz
Zone Head
Posts: 702
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posted June 14, 2012 02:24 PM
quote:
But seriously... locking right up while your riding? That'll pucker your ass right up.
hehehehehe LOL LOL LOL
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CajunBoyz
Zone Head
Posts: 702
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posted June 14, 2012 02:25 PM
quote:
Return hole in the master cylinder is plugged. Very small hole.
Yep , had that happen on my vulcan
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GHOSTMAN
Expert Class
Posts: 456
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posted June 14, 2012 03:24 PM
Ass gets tight thinking about it. Good thing was, I had just come out of a curve when it started grabbing again.
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dcjens
Pro
Wet side of Washington
Posts: 1059
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posted June 14, 2012 03:36 PM
I have a master cylinder..rear caliper and stock brake line if you want to just change it all out..dcjens@yahoo.com Darin
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Oz Booster
Expert Class
Posts: 230
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posted June 14, 2012 04:24 PM
I had one similar, s/h bike my daughter brought , a often pressure washed bike where rust had built up between the master cyl piston and the push rod , effectively closing off the port and not letting the pressure neutralise, strip and clean and its good
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STULER
Novice Class
Back Road Racer
Posts: 31
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posted June 14, 2012 07:01 PM
quote:
Rear brake locked up on me twice while on my way home yesterday. I loosened the brake pipe nut to relieve pressure and tightened it back as a quick fix to get home. Went about ten miles, and rear brake started seizing again on it's own. After that I called a buddy and trailered it home.
I haven't looked at it yet, but would like advice on what to look for and where to start.
The bike HAS been sitting for months, and I've recently put in about 700 miles with no incident.
Just had the same problem on my CBR1100XX blackbird. it was the rear caliper. I bled and bled and bled the lines. nothing.... rebuilt the secondary master cylinder..... nothing... rebuilt the rear caliper and bam. just like that worked like a charm. check the easy stuff first tho, like brake bleeding and such
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GHOSTMAN
Expert Class
Posts: 456
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posted September 14, 2012 12:28 PM
Finally getting time to look at my bike. What steps would I have to take to pull apart the master cylinder to inspect and clean?
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GHOSTMAN
Expert Class
Posts: 456
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posted September 14, 2012 12:38 PM
One note; I did see some fluid coming out of the rear caliper bleeder when it first happened. Could that be a sign of water in the fluid?
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GHOSTMAN
Expert Class
Posts: 456
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posted May 09, 2013 06:00 PM
Been a while since it was fixed, but the end result was that the rear brake fluid had not been changed and water had built up in the system. Flushed it and everything works fine. Thanks for the insight!
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