Hey need some help with front brakes on a gixxer. The prblem is the line is loosing all pressure and whats causing it is the calipers are coming out to slow or getting stuck so would have to pump brakes in order to get the fronts to work. So my question is what do you guys think i should do? I know where i can get the whole brake assembly for at a good price but its used. So would that be ok to replace it with a used one or go with a new one? i need to opinions fast before i place my order. But i think the used one would be ok hit me up and let me know

 

sounds like warpped rotors, does the brake lever pulse when they do work?

 

thanks for the input but i dont think its the rotors like i say we took the whole thing off and when the brake lever was pulled we saw that 2 of the calipers or watever that push out the brake pads wasnt coming out and if they did they came out slow we had to keep pumping the brake so they can catch up with the other ones. But i ordered some more so im hoping that will fix my problem. Like i say i kinda know its that because when the brake is pumped and they finally come out the brakes work good so either they were worn out or idk. But i got some on the way Im hoping it fix my problem. Like i say thanks for the input though and more are welcome

 

wow, of course only one piston per caliper will move out if they are not squeezing pads onto a rotor. hydrolics distribute pressure to the easy portion first.

 

so in other words you saying? can u break it down im kind of basic when it comes to mechanic work?

 

ok if you think about it, your master cylinder pushes fluid, when it pushes fluid that fluid releaves pressure (into the pads) which is what causes the pads to be squeezed against the rotors, if you stopped one piston from moving, the other piston on the caliper will move out just as fast if not faster. your problem with looseing power is that if your rotor is slightly warped it will push your pads in which will cause the piston to move in.. which will cause a few pumps to get pressure back..

http://auto.howstuffworks.com/brake1.htm
http://auto.howstuffworks.com/master-brake2.htm

 

oh ok i see what u saying now i will double check but i dont think the rotor is warpped i will check over again. Becuz it has no reason to be warped never down never even hit a pothole, hell its not even broken in yet. So besides the rotors being warped what else could be the problem?

 

not bled correctly. u need a special tool called a run out guage to messure warpness properly.

 

not bleed right? What is the correct way? Me and my boys bleed the hell out the brakes and i thought we were doing it right. So wat is the correct way?

 

run a clear hose from the bleeder bolt on the caliper up to the resi and pump fluid through it for a few minutes, then repeat on other caliper, then bleed out all old fluid with fresh new fluid, make sure you use good dot 4 brake fluid, not that shitty valvoleen **** from car parts store

 

ok ill try that maybe this weekend when i have time thanks again tho.

 

ok guys i need help again. i bleed the brakes changed the calipers and everything but the damn line is still lossing pressure i dont know whats going on. when the bike is off the brakes are hard and work like they supposed to, but as soon as i crank it and put it in gear the brake line looses all pressure!!! But some1 told me that if the screw that goes into the brake line isnt lined up with the hole that the brake fluid goes through to reach the caliper that its going to keep lossing pressure. is that true? Some1 please help me some1 tell me what is the prbolem or what could be the problem besides the rotors. Im trying to fix the prblem myself before paying a **** load of money and a shop so help me out

 

your an idiot. if your rotor is slightly warpped (you cant tell with your eyes) or your wheel hub is un-true it will push your pads back into the pistons on the calipers and the pistons on your calipers will move back and cause pressure loss DURHHH

it has nothing to do with your bikes power being on or in ******* gear, your brake system is standalone.. take your bike to a shop and ask them to see if your rotors are straight or if your wheel is true.

 

ok first off i never disrespected anyone on here or caused any trouble and people dont usually get to me but its hoe *** punks like you that tick me off. I never called you out of your name or came at you sideways so it was no need for you to call me an idiot! And second of all i never said i was an bike or brake expert and im sure its a lot more people thats not unlike YOU. And you know what if everyone was a expert there wouldnt be bike shops or forums like this because eveyone could do and find everything out on there own!!!! So get this ill make you a PROMISE!!!! If you ever come to Houston Ill beat the **** out of you for the hell of it!!!! I hate for a bith to start calling me out of my name for no reason and especially when i havent done a thing to the person. So **** you and i hope you get fucked with a AIDS DICK and you Die 30 times you punks *** boy!!!! Get at me you can find me in the H

 

go dry your tears sally, you are an idiot.. and you proved it by buying calipers because only one piston comes out when u squeeze the brakes haha.. maybe you should buy a new handler bar to schmuck