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Old 07-31-2010, 06:55 PM   #1
Totten_86
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front brake rotor

i droped my cbr600rr while riding into the back of my truck the left front brake rotor hit the tailgate bending it, but now whenever i squeaze the front break level i get nothing until i pump it a few times then it squeazes the rotors but it doesnt last long and i have to keep pumping the lever for it to work properly, i tried bleeding the brakes but who knows if im doing it right,

thanks for any advise
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Old 07-31-2010, 07:14 PM   #2
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If your rotor is actually bent, then bleeding the brakes isn't going to help.
When you apply the brakes the warped rotor is pushing the caliper piston in far enough that you have to pump the brakes to get it back out where it will make contact with the rotor.
Obviously this is a dangerous situation as you may need the brakes suddenly and they won't work like they should.
You will need to get the rotor straightened or replaced.

Don't mess around here, this requires the input of someone that knows what they are doing and the output of some cash. Trust me, it will be cheaper to get your brakes fixed than hospital bills .
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Old 07-31-2010, 07:20 PM   #3
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well put... replace the rotor! way cheaper than medical bills
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Old 07-31-2010, 07:25 PM   #4
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heheh this is why you should Never ride into your truck


*Let me guess I bet this happened. You have a skinny ramp you stated driving it up the ramp and cut the throttle as the front tire got into the truck and then you tried to put your foot down and... theres no where to put your foot down throwing yourself off the tailgate and having your bike fall over?


Hehehe.... I did that in 2005 :P Never again!
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Old 07-31-2010, 08:22 PM   #5
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Welcome. Sorry to hear about your bike. No sense in fooling around with something you dont understand. Bite the bullet, pay someone else to do it right.

Or you might get lucky and someone might volunteer to help. Just make sure they know what they're doing, otherwise you're just back in the same boat.

Good luck.
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Old 07-31-2010, 08:33 PM   #6
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i am working on replacing the rotor but i dont understand why when i squeaze the lever it doesnt work i dont want to put on a new rotor and have the same problem then ill be back at square one haha thats
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Old 07-31-2010, 10:17 PM   #7
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Quote:
Originally Posted by Totten_86 View Post
i am working on replacing the rotor but i dont understand why when i squeaze the lever it doesnt work i dont want to put on a new rotor and have the same problem then ill be back at square one haha thats
That's why twice it has been suggested that you let somebody that knows what they are doing, take a look at it. We can't diagnose accurately on the internet and you don't seem to be clear on what is wrong.
If you aren't sure, why would you replace the rotor?
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Old 07-31-2010, 11:49 PM   #8
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well it is bent usually when something is broke you replace it, id much rather do it myself i just dont understand why it works when i pump it but then it looses "prime" so to say im just looking if anyone else had the same problem. i dont understand how i am not clear, the rotor is bent from impact on the tailgate of my truck and now when i squeaze the front break lever it doesnt work like it should
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Old 08-01-2010, 12:29 AM   #9
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I found a used rotor for my 600 for $10 and it was solid strait. Put it back on with some locktite and it worked fine.
If you're having problems with the caliper not closing right, you need to bleed them to make sure no air is inside it. Also, check the levels. Not sure how it could have happened, but it could have.
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Old 08-01-2010, 10:09 AM   #10
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where did you find a used rotor after market ones start at 150 up got 2 kids to feed you know what i mean
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Old 08-01-2010, 10:24 AM   #11
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Quote:
Originally Posted by Totten_86 View Post
well it is bent usually when something is broke you replace it, id much rather do it myself i just dont understand why it works when i pump it but then it looses "prime" so to say im just looking if anyone else had the same problem. i dont understand how i am not clear, the rotor is bent from impact on the tailgate of my truck and now when i squeaze the front break lever it doesnt work like it should
Hard to explain without pics but...

When the bent part of the rotor passes by the brake pads inside the calipers, it pushes the pads away from itself. The pads push against the pistons in the calipers.
Remember this is a simple hydraulic system so once the pistons get pushed deeper into their bores, there is nothing to make them return except hydraulic pressure. So, you pump the lever, creating pressure and the pistons push the pads back against the rotor...
Until the next time the bent part passes thru the caliper.

If you are riding along, the pistons will stay as far in their bores as the bent rotor pushes them, until you need to stop and begin pumping the lever.
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Old 08-01-2010, 10:33 AM   #12
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awesome thanks so do you think if i replace the rotor with a good straight on the issue will be resolved? do you think ill have to bleed the brakes after i install the new rotor
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Old 08-01-2010, 10:45 AM   #13
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Bumblebee is exactly right, replace the rotor and bleed the brakes just because but that should fix the problem, the piston and master only have soo much stroke, so when the bent rotor pushes the caliper piston in then 1 squeeze of the lever doesent have enough stroke to apply the pads, so it takes 2 or 3 squeezes to apply contact and pressure from the master to the rotor and as soon as the bent rotor pases through the caliper again it pushes the piston back in again and this will do this everytime the wheel turns
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Old 08-01-2010, 10:48 AM   #14
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Quote:
Originally Posted by Totten_86 View Post
awesome thanks so do you think if i replace the rotor with a good straight on the issue will be resolved?
Probably, if the problem is a bent rotor, then replacing it should fix it.


Quote:
do you think ill have to bleed the brakes after i install the new rotor
It wouldn't be a bad idea, mostly just to make sure there is no air in the system and to get fresh fluid down in the calipers.
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Old 08-21-2010, 06:22 PM   #15
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Listen to bumblebee. And replace the pads when you replace the rotor. And clean the pistons while you're there. Then bleed. Do a search here for bleeding brake or changing brake - I seem to recall some good write ups, and onthethrottle has some good videos.
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