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Old 02-28-2012, 08:01 AM   #1
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Unhappy rubbing front brakes

So I've scrubbed my pistons clean 3 times and flushed the brakes with whole bottle of brand new dot4 and my pads still rubbing the rotor. Not a bent rotor more like constant friction like a little air in the lines. I can get maybe one complete rotation out the front wheel before it abruptly stops. Ive read online about using dry teflon spray lube on the pistons to keep them from sticking but can't find that in a store for the life of me. Anyone know where to get it or something else that will work well? I've got two trackdays the weekend and need the brakes tip top. If I can't get them any better by then ill be calling in sick Friday and heading to Motorcycles Unlimited for the overhaul.

Thanks.
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Old 02-28-2012, 08:50 AM   #2
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Bump. any recommend lube for caliper pistons?
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Old 02-28-2012, 08:52 AM   #3
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63221828 61e0 8f65

If this is the stuff, its at wally world and Lowes...
Quote:
read online about using dry teflon spray lube on the pistons to keep them from sticking but can't find that in a store for the life of me.
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Old 02-28-2012, 08:54 AM   #4
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Quote:
Originally Posted by 4.6flash View Post
63221828 61e0 8f65

If this is the stuff, its at wally world and Lowes...
Might be thanks. Hardware and autoparts looked at me like I was crazy.
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Old 02-28-2012, 08:56 AM   #5
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I get about the same drag on mine when its on the stands. I replaced the pads and it seemed to improve. Cleaning the entire caliper to get the brake dust off helps but from what I've read drag is expected to some extent.

RidersDiscount posted some useful info on their race bike build (09-10) where they ran into this issue and did everything they could to the existing brake arrangement but with no significant success they ended up slapping on brembo hardware and it resolved the issue entirely. YMMV.
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Old 02-28-2012, 08:58 AM   #6
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Quote:
Originally Posted by plummer View Post
Bump. any recommend lube for caliper pistons?
huiles de lubrification respectant l environnement 446030

Autoparts should have it...
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Old 02-28-2012, 09:03 AM   #7
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Quote:
Originally Posted by 4.6flash View Post
huiles de lubrification respectant l environnement 446030

Autoparts should have it...
and probably a good idea to get the rebuild kits since your in their and didn't see mention of replacing them.
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Old 02-28-2012, 10:45 AM   #8
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Double check that the reservoir isn't overfull.
Have you isolated the calipers to see if it's one side or the other?
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Old 02-28-2012, 10:51 AM   #9
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Old 02-28-2012, 11:05 AM   #10
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08 Gsxr 600 seems like its the right caliper. I've cleaned and work the pistons in and out to many times to count. It just seems like they aren't releasing near enough. I know a little rub is nomal but like I said a can't spin the wheel one full rotation.
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Old 02-28-2012, 12:50 PM   #11
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Common gsxr problem. I don't remember the fix though. I wanna say atleast one guy fixed it with a new master cylinder.

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Old 02-28-2012, 01:01 PM   #12
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Not a very good video but best I can do on my lunch break. I'm gonna try the dry teflon to lube the pucks this eve. Hopefully it works
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Old 02-28-2012, 01:06 PM   #13
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Loosen both of your pinch bolts.
Spin the wheel a few times while slapping the brake lever.
Retighten the pinch bolts and see if it cures it.
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Old 02-28-2012, 01:07 PM   #14
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Did this all of a sudden started happening or did this wheel you took the front wheel off? It's very easy to cross up an bind everything if you tighten everything down while the wheel is on the front stand and not the ground.

My problem went away when I changed to a r6 mc
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Old 02-28-2012, 01:08 PM   #15
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Quote:
Originally Posted by Patrick View Post
Double check that the reservoir isn't overfull.
Have you isolated the calipers to see if it's one side or the other?
It was doing it with the reservoir lid off and with it filled up to the rubber cup and capped.
Seems like its on the right side. Crazy thing is the cups all come out pretty evenly when pumping and seem to release back. I put a 1/2 block inside the caliper with the pads out and set the pucks down against it and once off the brake it falls right out.
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Old 02-28-2012, 01:11 PM   #16
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Quote:
Originally Posted by Patrick View Post
Loosen both of your pinch bolts.
Spin the wheel a few times while slapping the brake lever.
Retighten the pinch bolts and see if it cures it.
I will try this when I get off thanks.
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Old 02-28-2012, 01:17 PM   #17
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Quote:
Originally Posted by 103 View Post
Did this all of a sudden started happening or did this wheel you took the front wheel off? It's very easy to cross up an bind everything if you tighten everything down while the wheel is on the front stand and not the ground.

My problem went away when I changed to a r6 mc
Yes just got a new tires but it seemed pretty tight before I pulled the wheels off. After reinstall of wheels, caliper cleaning, 4 resevoir full worth of flushing, and a test ride, put it up on the stands the check the wheel spin while it was hot and it was still tight, maybe even a little tighter
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Old 02-28-2012, 01:22 PM   #18
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Quote:
Originally Posted by plummer View Post
It was doing it with the reservoir lid off and with it filled up to the rubber cup and capped.
Seems like its on the right side. Crazy thing is the cups all come out pretty evenly when pumping and seem to release back. I put a 1/2 block inside the caliper with the pads out and set the pucks down against it and once off the brake it falls right out.
Drain the fluid down a hair also.
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Old 02-28-2012, 01:26 PM   #19
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Quote:
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Drain the fluid down a hair also.
^will do.

If I can't get anything going tonight I may take some time off work between now and this weekend to get it down to ur shop and let ur guys look at it.
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Old 02-28-2012, 03:03 PM   #20
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Hmm.. that is wierd. Your tire should have spun pretty easy. Are you sure the front tire alignment is right as well as installed right? Wheel spacer is correct? Brake guide pins not marred or anything? Did you install new or aftermarket brake levers? You you did maybe you didn't align the guides right and it's applying pressure to the piston on the MC which is causing both calipers to squeeze more on the brakes.

Try remove some fluid like Patrick said and see if that helps. You can also try removing right caliper off and see if the left caliper works as it should by spinning the wheel and and pressing on the brakes. Then vice versa.

I've seen rubber brake lines collapse on trucks but never seen it on a bike so I doubt that's your case.

edit: I'm no mechanic... just throwing out some plausible ideas.
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