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+--- Thread: Front Brake Keeps Building Pressure/locking up (/showthread.php?tid=48886)
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Front Brake Keeps Building Pressure/locking up - KYD - 04-29-2013
Alright, what the shit is going on with my damn front master. its the stock 06/07 GSXR600 Nissin Front Master. Rode the bike 50miles after I bought it last year. Not a problem. Replaced all stock lines with Stainless Steel Russel Lines with brand new crush washers. One line down and One crossover line. I filled up my ressy with MOTUL RBF600 cracked my master bleeder and waited for gravity feed....nothing after waiting 10minutes. Hmmm, pumped the handle a shit load and bled it normaly...NOTHING. Hmmm, got the vaccum bleeder Pumped it up to about 20psi...fluid sucked through the master immediately. Sweet, did the same thing on each caliper pulled fluid through no issues. Get the bike out and go to take it around the block. Made it 2 miles and front brake I could feel getting stiffer n stiffer until errr errrrr er. LOCKED THE HELL UP. wtf? had to have STUBBZ bring me a wrench on the side of the street so I could get the bike home. had this happen to a couple other bikes and its always the front brake lever cuz theres a little bushing within the lever that if the plunger isn't within the hole itll build pressure and lock up. Didn't think it was it, but screw it why not look at it. Nope, lever was fine. Soooo I re-bled the entire front, made sure everything was tight. And the son of a bitch did it again. Hmmmmmmmmm, I fill my ressy's to the very top and put the cap on and catch the excess in a wrag so theres no air. Thinking that might be the issue where the fluid cant expand in the ressy I took some out and tried it again....fucking fail! WHAT THE HELL IS MAKING MY FRONT MASTER LOCK UP? someones gotta know.
Another note...on my handbrake. This is my first Brembo 16x18 handbrake master. I have it on my HoHey DCB with another SUZUKI signle piston rear caliper on stock rotor. I cant get it to lock up the rear wheel while riding up to a driveway or stop sign. its got brake power but WONT lock up the rear wheel no matter how hard I squeeze the bitch. is this normal function and its just the feeling ill have to get used to?
Front Brake Keeps Building Pressure/locking up - old man roger - 04-29-2013
Sounds like you got fluid on the rear pads.
The front sounds like you either have too much fluid in the reservoir or your lever isn't releasing the plunger all the way out, some after market levers will hold a little pressure on the pin that pushes the plunger in.
If it's neither of those two problems, then the only other things I can think of would be dirt in the return port of the master or sticky calipers.
The most common cause is an over filled reservoir, there is a full line for a reason.
Front Brake Keeps Building Pressure/locking up - KYD - 04-29-2013
true because fluid needs room to expand. there could be fluid on the pads because I bled it by myself and it got a little messy. I'll see if I can take the nissin master for the front apart and see if its got some dirty built up in it. its just baffling me that it worked fine last year, and now it's all screwed up. what do you suggest to clean the pads with? just ride the bike and drag the brake now n then to clean the surface or a Brake Parts Cleaner?
Front Brake Keeps Building Pressure/locking up - Stubbz63 - 04-29-2013
pads should feel spongy if been soaked but if theyve been soaked youd have to replace them pretty much. thats only other thing i was thinkin was dirt in master somewhere. did you use a new banjo bolt or an old one when you installed the line into master. blow air threw the banjo bolt before install? i always do just to be safe. most resy diaphrams create there own air bubble which is usually enough but i wasnt sure with the small brembo resys, ive always filled min to where they overflow when the caps put on and never had a problem with brakes getting hard or locking up, usually when they get hard it means there about to fade and just not have any brakes there anymore. but ive never used the small resys like i have now either.
Front Brake Keeps Building Pressure/locking up - KYD - 04-29-2013
I used all my stock banjo bolts just used new lines and crush washers. I rode the bike for more then an hour two separate times last October and didn't have an issue. parked it in the garage and didn't touch it until February. Saturday was my 3rd time ever riding it and now it's got this issue. don't really see dirt being the issue, I've never taken the master apart. everything is pretty much brand new. but I'll give it a look when I get home after work
Front Brake Keeps Building Pressure/locking up - old man roger - 04-29-2013
Water is usually enough to get the brake fluid off the pad as long as you do it before you heat them up, unfortunately once you heat them up with brake fluid on them they kind of act like a sponge.
I have heard of people using a torch to heat the back of the pad and boiling out the fluid but I would suspect the pad wouldn't work too good after getting that hot.
Keep in mind that new pads work like crap till they are seated with the rotor.
Stubbz mentioning the banjo bolts, reminded me of another possibility for the front brakes locking up. If the new lines are thicker at the banjo bolt than the stock lines, then the stock banjo bolts may not line up with the new lines. The hole in the banjo bolt should be centered in the line.
Front Brake Keeps Building Pressure/locking up - Stubbz63 - 04-29-2013
great point on that last one roger, thatd be worth checkin out or measurein the banjo on old line vs new ones.
Front Brake Keeps Building Pressure/locking up - da Liks - 04-29-2013
i would like to emphasize the "dirt in master" theory.. seen it a couple times..
Front Brake Keeps Building Pressure/locking up - KYD - 04-29-2013
Originally Posted by old man roger
Front Brake Keeps Building Pressure/locking up - R1wonder - 04-29-2013
Shouldn't fill the cup all the way either !