Brake drag

I have a 2012 cbr 600rr. The front brakes seem to drag way to much. When the front wheel is spun it maybe turns 1/8-1/4 of a revolution and stops. Pushing on the wheel it feels very tight. I've disassembled the front calipers and cleaned an regressed the o rings inside. What else can I do?

 

The rotors probably have a bit to do with that, try the same thing with the rotors warm I bet it frees up quite a bit.

 

get the brakes hot and try to spin them? If it works it works, do you know why it would do that?

 

Take the wheel off and put the Axel back in and see if it moves freely if not adj the fork legs as needed...and when your done putting the wheel on leave it loose and drop it on the ground and give it a bounce or two then tighten everything...GSXR's have the same issue and this seem to help it a bit

 

Yeah don't tighten everything up on a fork stand put the wheel on the ground before you torque everything down.

 

Clean your caliper pistons with brake fluid.

 

Second what pigman suggested. Also check the wheel bearing covers. Being a race bike and how you ride/maintain it... there is probably something to be gained there by trimming them back.

 

This is how I currently put the front end together.

 

You mean the bearing seals?

 

with the calipers removed the wheel spins forever so I don't think is has much to do with the wheel bearing seals.

 

yes

 

check the rotors to make sure they are straight

 

Also, I would suggest rebuilding the calipers with new seals. When grit builds up behind the dust seals, it does not allow the pistons to back off as easily.

 

The rotor might just not be sitting on the buttons quite straight giving you a little drag, once the rotors heats up and expands a little it might tend to move around and center itself better in the pads and on the carrier and free up the wheel a bit. FWIW my front wheel doesnt spin for shit either but there isnt anything wrong with it.

 

also, be sure your brake fluid is not above the fill line. Too full can also cause issues.

 

I seem to remember TDub saying that on the older 600rr's the rotors were somewhat offset on each side and if you had the front wheel mounted backwards you would have a lot of brake drag. May not be that at all but worth checking you have the rotation correct.

 

Look at the condition of your brake pads... Are they wearing more on the leading edge than the trailing edge???

Once this condition starts it gets worse and worse until you replace the pads...

Bouncing the suspension a few times before torquing the axle bolt helps a lot... Then, torque down the fork/axle pinch bolts...

I had issues with my GSXR front end... Then I switch rotors to full floater rotors... They were noisy... But they would spin like 7-8 full turns!!!

Luis

 

do you aftermarket levers? I've seem guys have the pin cocked a little on the lever and preload the brakes

 

Stop using EBC brake pads

Try Carbon Lorraines or Vesrahs. Pricey but worth every penny!

If you're not using EBC's then give everything else a try that is stated above.
If you are using EBC's... don't ask me why but on certain bikes they drag and drag bad!!! My F3 was doing the same thing. I spent better part of a year chasing what I thought was misalignment of of wheel, axle, brake calipers. Also tried disassembling the calipers and cleaning with new seals, multiple brake fluid changes (with Motul), etc, etc, etc. Stickboy finally sold me a set of Carbon Lorraines. When trying to spin the front wheel (hard spin at that) I went from less than half rotation before quickly stopping to 2 to 2.5 turns on a moderate spin. Usually a bit more when I come off the track hot.

I can't answer it. All I know is I love my CL's now and can only imagine the horsepower loss when I ran the EBC's last year. As for clutch, I'm really happy with EBC Kevlar clutch but that's a different story for a different time.