Nightmare of a brake problem - FZ6 S2

[Shinigami]

So, for a while i've been having issues with my rear brake, it's basicly chewing through pads in less than 1000 miles and doing so at an odd angle and uneven, also seems to be sticking occaisionally.

Now i've replaced the rota & pads, completely cleaned the fuck out of the caliper and pins, both slide pins baby smooth with 1500 grit sand paper (were ever so slightly rough) and greased them up.

Piston is pretty much spotless, no corrosion on it at all, with the caliper out and lever pressed then released the piston looks to retract a little though i've no idea how much it should.

Brake fluid also changed and lines bled.

Problem is still persisting today, went to feel the rota temperature and was red hot after little use of the rear, on centre stand it's clear it's not released the pads as it barely moves when try to spin it by hand

Any ideas? Next step i'm going to replace the seals on the piston maybe?

The caliper is a single pot nissin caliper
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Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.

[Matt B]

[Shinigami]

by occaisionally I don't mean in a single rotation, just on some days it seems to stick more than others, before I just changed the pads again most of the time it didn't feel like it was sticking at all but it must have to some extent to wear the pads so quickly..
____________________
Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.

[Matt B]

Have you stripped the caliper and removed the piston? Could be a mashed seal inside.
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stinkwheel: He had an animated .gif of a cat performing fellatio. It's not socially acceptable. It can have real life adverse effects on other people.

[Shinigami]

i did a when it first started sticking but didn't notice anything obvious, I will have another look this weekend as won't have time to pull it all off and bleed it etc until then
____________________
Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.

[Copycat73]

is there one of those spring steel anti rattle / hold the pads in the correct position things fitted to the caliper ..
so is it fitted correctly ..?
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Whatever I post I have no citation and no intention of providing one..
caveat emptor

[Rogerborg]

Does the piston push back into the pot with finger pressure?

If not, replace the seals or at least get the fluid seal out and clean out the groove behind it. Although you might as well replace it if you're doing that.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Shinigami]

[Parson]

Seals sounds like the only thing left.

What kind of grease did you use on the pistons? Some types of grease will damage the seals. I spoke to one of the mechanics the local Suzuki dealers, rubber grease only on brake pistons. He gave me a wee dab recently when I was having isssues, a very helpful fellow.
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Then gsx650F - Now VFR800F

[monkeybiker]

Is the foot pedal stiff?

[Shinigami]

[Rogerborg]

It really does need to go back in smoothly and easily. Your disc isn't going to exert that much pressure. I mean, unless it's warped which would be a different issue.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Shinigami]

new seals ordered only £3 on wemoto so worth trying

https://radiomaxmusic2.files.wordpress.com/2014/02/seal.jpg

and I'll be riding the womans cbf125 into work until then
____________________
Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.

[Matt B]

[Shinigami]

so changed the seals but still happening. Still difficult to push the piston back in by hand again too...piston looks spotless though so no idea whats going on if I push the caliper against the disk it pushes the piston back in enough to release the wheel again

anyone know any decent bike garages in manchester who know their shit with brakes?
____________________
Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.

[Pete.]

When you do the seals you have to scrape all the crusty white oxide powder from the bottom of the seal groove or the new seals will grip the piston too tightly.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Shinigami]

[Shinigami]

might have another go and give the grooves a scrape out to be sure before I take it somewhere
____________________
Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.

[Val]

[kramdra]

If they are anodised callipers they will not have corrosion in the seal groves (but plenty of dirt, brake fluid residue)

Do not scrape them with anything metallic. Match sticks work well.

[LongJohn22]

[Pete.]

Anodised calipers rot as well. It just takes longer.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Shinigami]

[kramdra]

[Shinigami]

Cleaned it out, seals sitting nicely flush, was able to push piston in by hand, pooped straight in all the way down once past the seals. Rebled and refitted.....

...still binding. What the fuck. I'm just gonna set the bike on fire instead I think
____________________
Current: Honda City Fly CLR125 2003 Honda CB600F Hornet 2008 Yamaha FZ6 S2 + 1991 Kawasaki GPZ500
"Once you realize what a joke everything is, being the Comedian is the only thing that makes sense.