Brake issues

[Pittenger5]

Well, if you were at the track this weekend, we've probably gone over this, but nothing was solved.
So all weekend, I was dealing with some strange brake problems. The brakes would be 100% going into the bowl, by the time I made it to 9, when I touched the brakes, the lever would come all the way to the bar, then the next pull would be 100% again. This would ONLY happen in turn 9, and it was at least 75% of the laps. It got to the point I was purposely touching the brake earlier to reset the pads before I needed to actually scrub some speed. (and yes, I know Im a big pussy for braking in 9, thats something no one can help me with) We changed the master and it was still happening, so its not the master. The first thought everyone comes up with is a bent rotor, but its the exact same corner every time. Never had much of a problem anywhere else. The next thought is being leaned over, hitting the bumps and stuff, but with the chicanes you flick the bike around a lot more, and never had a problem into 3 (thank god). So I dunno, I have no other guesses. Anyone have any guesses or better yet, solutions?

[FTMS]

Check the rotor for being warped and the wheel for play. Either one of those could move your brake pads out enough that you need an extra pump of the lever to get them back to a point that one pull will squeeze them. Also check the caliper pins (if it has a floating caliper) and make sure the caliper will move as it is supposed to.

[GixerJockey]

Turn 9 is possessed... That's the only answer.

[RyanNicholson]

Yea I was going to say wheel play or something like that too, but even that doesn't make much sense if T9 was the only corner. Might it have something to do with the head shake over T8?

quit braking in T9 anyway...

[Pittenger5]

quit braking in T9 anyway...

I am a huge vagina. But yah, I get decent shake in 7, but I do in 4 over the hill and stuff too, not as bad though. I even went out of my way to miss the bumps a few times and it still happened.

[Tricky Mike]

Daniel's bad brake Ju-Ju jumped from his bike to yours at some point?

[Pittenger5]

Daniel's bad brake Ju-Ju jumped from his bike to yours at some point?

DONT YOU PUT THAT EVIL ON ME TRICKY MIKE! Don't you put that on us! You are NOT paralyzed!

[Tricky Mike]

Didn't mean to harsh your mellow, brah

[Sheppo]

Richie, this is basically what my vmail said too.. wheel shake.

[Pittenger5]

I figured it was that, but why am I the only one having this issue? And how can I fix it.

[Doc]

Are your spacers correct? Wheel bearings ok?

[Pittenger5]

Are your spacers correct? Wheel bearings ok?

I hope so ...
And I would hope so ...

Is tehre a way to check either

[Sheppo]

With the bike on a stand and the forks secure. ( maybe someone holding them steady ) Grab the front of the wheel, shake and make sure there is no movement. Aside from rotating on the axle there should be no wiggle, shimmy, sideways movement at all. EVEN a very little movement is enough to walk the disk pucks back into the caliper.

[butcher bergs]

I figured it was that, but why am I the only one having this issue? And how can I fix it.

quit braking in T9 anyway...

[Pittenger5]

So then next week I will post up, and now in 11 I need to grab the brakes twice. But I tell ya, if I can keep this pattern up and just not use the brakes Im gonna be faster than Jeff!

[Rambunctous]

I do not see how a wobble puts air into your brake system.

[RyanNicholson]

I do not see how a wobble puts air into your brake system.

It could compress the pistons in the caliper so the pads aren't up against the rotor the way they should be. Kinda like how you have to pump pressure into the system again when you put the rim back on.

[OreoGaborio]

+1

it's not that air is getting in the system, the rotors are somehow pushing the pads back into the caliper.

[BMFR6]

+1

it's not that air is getting in the system, the rotors are somehow pushing the pads back into the caliper.

to ECK #187

[OreoGaborio]

Wirelessly posted (Samsung Lube.... Er, Glyde: Mozilla/5.0 440x240 Samsung SCH-U940 NetFront/3.4)

thanks...... Mark.....

[Rambunctous]

that is some serious wobble to do that. Wow! I guess I learned a thing today. Now what? A stabilizer?

[obsolete]

that is some serious wobble to do that. Wow! I guess I learned a thing today. Now what? A stabilizer?

It's not the bad wobble that's the problem. The wobble is what is allowing the problem to be seen. It should be able to wobble and not do this. There is a bad part that is allowing the wobble to torque or shake a part that creates a non linear spin of the rotor therefore pushing towards the pads and causing the piston to retract into the caliper.

The wobble is just the catalyst, get rid of the wobble the problem would still remain.

[Pittenger5]

The wobble is just the catalyst, get rid of the wobble the problem would still remain.

I even changed my line in practice and it still happened.

[richw]

Rotors float ? so check attachment hardware.

Don't do anything until you have cleaned the f out of them with rags and brake clean

Even clean then lightly break the surface of pads and rotors with emery etc swirl.

Flush the brake fluid throug the system if it has high water content it can boil then condense woooo wooo woooo

[BLACK SQUIRREL]

Also Note that the Rotor and Caliper are both brand new.