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Old 11-04-2012, 10:52 AM   #1 (permalink)
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Default vibration at slow speed braking

i have a new z750, and so far ive only got around 5000km on it, but recently i notice vibration from the front brake at slow speed.

when i brake harder at low speed (10-20kmph ish) there is a major vibration sent through my bar, and i can actually hear the vibration.

everything else is fine, i can brake normally at higher speed with no problem. the pad and disc, everything is original from factory, never replaced anything.

anyone has the same problem? any idea whats wrong and what i can do?

thanks in advance.
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Old 11-04-2012, 11:22 AM   #2 (permalink)
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Warped rotor.
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Old 11-04-2012, 03:15 PM   #3 (permalink)
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Old 11-04-2012, 03:41 PM   #4 (permalink)
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Correct! Warped Rotor. I had a 05 Z750s with the same issue. I went and replaced them with Galfer rotors and was perfect ever since.

For some reason, the stock rotors on this bike were prone to this.

Jim
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Old 11-04-2012, 07:11 PM   #5 (permalink)
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I have the opposite problem on my zx6r. I have a hum, with slight braking, but when I brake hard it's completely silent. no vibration, not felt, but there must be if it's a loud hum. some what high pitched.
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Old 11-05-2012, 11:07 AM   #6 (permalink)
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ahh damnit... $$$...... whats the best rotors for its price around? except for galfer, just wanna know what other options r there
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Old 11-05-2012, 12:51 PM   #7 (permalink)
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Originally Posted by jy7347 View Post
ahh damnit... $$$...... whats the best rotors for its price around? except for galfer, just wanna know what other options r there
You're going to be spending a mint for anything new, regardless of brand.

EBC, Braking, Galfer, OEM, they're all spendy.
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Old 11-05-2012, 12:52 PM   #8 (permalink)
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https://www.motomummy.com/rotors/bra...ont-rotor-set/

Braking Knock off Galfer Wave rotors.

Work awesome, braked hard on them (after a gentle 200km break in period) often enough and they didn't warp (if you keep in mind not to brake hard on cold rotors).

I rode around with slightly warped rotors for almost 30 000km becuase i didn't have the spare money to replace rotors.

Just check with the other Z750 owners if your bike uses the same rims and disc diameter than a ZX6r.

If you have a private shop in your area that stocks parts from salvaged bikes, check them for some used stock rotors.
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Old 11-05-2012, 03:06 PM   #9 (permalink)
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Might be able to pick up a set of Alth rotors from the forums. They were going for a good price a while back.
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Old 11-05-2012, 03:51 PM   #10 (permalink)
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Originally Posted by Sev View Post
Warped rotor.


Since he said his braking is fine at high speeds, wouldn’t a warped rotor be noticeable at higher speeds and not so noticeable at slow speeds of 10-20 kph as the OP posted? That’s always been my experience and I’m riding a bike now that has a slightly warped rotor.


And to the OP, when you brake “hard” at 10 or 20 kph you tend to stop on a dime so I don’t think you’d notice a warped rotor braking “hard” at such slow speeds. Just my $.02. What am I missing?
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