Strange Front Brake problem

[shaba2000]

Guys

The other day I forgot to take off my disk lock and tried to ride the bike. I managed to keep it up and limit the embarasment however now am having the following problem...

When the bike is moving and I press the front brake lever it just goes all the way in and doesnt stop the bike.
If I stop at the lights and keep pressing the front brake lever it hardens up as becomes normal and stops the bike from moving as normal.

I took off the caliper and cleaned it and examined all pipes for leaks etc and everything seems fine?

would appreciate any suggestions as I am riding on my back brakes only at the moment and am contstantly ready to dive off in case i need to do a emergency brake!

Its a kawasaki zx6r 1997 f3 model by the way
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kawasaki Ninja-zx6r 1997 (f3)

[Ichy]

only things I can suggest is that either 'somehow' air got into the system, should be sorted if you bleed them, or, the caliper has been twisted creating a bigger gap to the disc.

When you build up the pressure does it remain constant if you keep the lever held in?
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[shaba2000]

Thanks for the replt Ichy.

When the bike is on standstill it remains constant and just like normal. Only when the bike is moving it does work.

I was thinking to bleed them this weekend to see if that resolves it but then if that was the case it wouldnt work even on standstill right?
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kawasaki Ninja-zx6r 1997 (f3)

[Ichy]

I thought of that as well Chris but would of expected the OP to mention the pulsing when braking.

It does sound like something is bent, got any photos, especially of the gap between the pads and disc.
Any way you can get the front wheel off the ground and give it a spin?
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[gavcarter]

Sounds more likely to be a misplaced brake pad i.e it has moved or air in the line.....

I cant see any real damage being done from a disk lock

You 100% its not leaking though?

[Kickstart]

Hi

I would go with the idea of a fairly badly bent brake disk. Support the front end, spin the wheel and check for the disk appearing to wobble.

All the best

Keith
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[shaba2000]

Thanks for all replies guys.

I will go home and put it on the front paddock stand and spin the wheel to check for a bent disc and i will also try what chr15 suggested about stopping and checking the front brakes when the lever is at its loosest.

100% sure there are no leaks also.

Will update you guys tomorrow of my findings.

Thanks again
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kawasaki Ninja-zx6r 1997 (f3)

[Blue_SV650S]

Its a bent front disc. A fairly common result of a disc lock mishap!!

You can try and bend the old one back, but your chances of success are very slim!!

Its a new disc I am afraid
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The purpose of life is to fight maturity.

[Pete.]

Bent disk or carrier for sure!
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[shaba2000]

guys I got it on the paddock stand and spinned the front wheel.

It is a bent front disc!!

Ah well something new learned and lucky its the end of month so new discs it is then!

thanks for all replies.
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kawasaki Ninja-zx6r 1997 (f3)