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Discussion Starter #1
So, today I was riding my Gen.4 ZX-10R and noticed that whenever I would ride the front brakes a little harder than normal, the bike would start vibrating, rattling, and jolting a bit.

I rode my buddy's Gen.4 ZX-10R and his bike doesn't do that. You also have to squeeze my brake lever a little deeper than usual to really use the brakes. However, when you squeeze his brake lever, it is very sensitive and the brakes engage right away.

Could this be a sign of:

-warped brake rotors?

-bent brake rotors?

-bad brake pads?

-bad brake lines?

-loose steering head bearings?

Any help is greatly appreciated!

Thanks!
 

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Head bearings need tightening a bit.
 

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Discussion Starter #4
Head bearings need tightening a bit.
Sounds about right. But, why would my brake lever take more effort to pull to engage the brakes than my buddy's brake levers, which are very sensitive and engage right away when you barely pull it?
 

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Some o' these posts scare me. This guy has some kinda problem, either the brakes, the master cylinder, air in the lines, pads, rotors...maybe the steering bearings? Dude, I would really say take the bike to a good mechanic because there are too many things that can go wrong and I'm sorry, but the front brakes are the last thing I would want to have fail on me.

I would rather the traction control stop working.

Just sayin'...
 

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I had a bad master on my 2012. I would bleed the air out and the lever was nice and firm but two days later it would be all squishy. I did that a few times with same results so I went to a Brembo.
 

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Some o' these posts scare me. This guy has some kinda problem, either the brakes, the master cylinder, air in the lines, pads, rotors...maybe the steering bearings? Dude, I would really say take the bike to a good mechanic because there are too many things that can go wrong and I'm sorry, but the front brakes are the last thing I would want to have fail on me.

I would rather the traction control stop working.

Just sayin'...
Yeah, I think I might take it to the guy who did my tires. He knows his stuff.

What do the pads look like.
Not sure to be honest. Haven't checked them out. But, my brakes don't make any noises or squealing.
 

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I had a bad master on my 2012. I would bleed the air out and the lever was nice and firm but two days later it would be all squishy. I did that a few times with same results so I went to a Brembo.
That happens. Suzuki had a big recall on their m/c's for a lot of the Gixxers. Had to get mine replaced.
 

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Based on the symptoms described with the juddering happening in the front end under heavy braking, that's typically indicative of a loosened head bearing. At lower speeds, it isn't as prevalent but as the speeds increase and the braking forces get higher, the slip in the bearings becomes evident. And the front starts to shimmy and judder.

When was the last time the brake fluid was changed? The firmness in the lever is probably related to some water in the fluid if it hasn't been changed in the last couple of years. Brake fluid is hygroscopic and will absorb water over time. It could also be a bad or failing seal in the master cylinder. But it would be most prudent to change the fluid and bleed the system to see if it affects the problem before moving on to the more complicated of the solutions.
 

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Based on the symptoms described with the juddering happening in the front end under heavy braking, that's typically indicative of a loosened head bearing. At lower speeds, it isn't as prevalent but as the speeds increase and the braking forces get higher, the slip in the bearings becomes evident. And the front starts to shimmy and judder.

When was the last time the brake fluid was changed? The firmness in the lever is probably related to some water in the fluid if it hasn't been changed in the last couple of years. Brake fluid is hygroscopic and will absorb water over time. It could also be a bad or failing seal in the master cylinder. But it would be most prudent to change the fluid and bleed the system to see if it affects the problem before moving on to the more complicated of the solutions.
Thanks for the input! I took it to a mechanic and it turns out that my left front brake rotor is bent. :frown2:

On that note...

Does anyone have one for sale? lol
 
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