Question about 1989 Suzuki GSX-R 750 RK

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Brakes issues I have a K4 600 that is having some issues. When coming to a stop I get a nasty shutter from the front end. It seems to be at the highest friction point when coming to a stop. My bike has been in the shop since last Wednesday. My mechanic doesn't want to believe it is the rotors as of yet, he is trying to save me money. The bike is bone stock. Tires: Dunlop 220's front and rear at about 36 psi cold. Brakes: Stock rotors, Galfer pads in front. So far we have replaced the stock pads, with 20k on the ticker they needed to be replaced. Head bearings have been replaced. Wheel bearings where replaced today. He mount a Pirelli Corsa III on the front, still got the shutter. He mounted a Dunlop Qualifier, still got the shutter. His next option is to borrow his buddies front wheel and disc and see if they shutter is there. If it is not, then it is more than likely the pads. He also played with the suspension too, thinking it might be there? Anyone else had this issue before?

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It sounds to me like its more likely to be the discs, you should skim the discs if possible, otherwise replace them and scuff the new pads flat before refitting them. Would replace the fluid and bleed the brakes. Make sure the brakes are beed in slowly no heavy braking otherwise the same thing will happen again over heating the discs and warping them. When ever you ride your bike warm up the brakes with slow smooth braking before you get into a good speed. Dosnt take long but will keep them in better condition.

Posted on Feb 13, 2009

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I would suggest it is the rotor carrier buttons. The stock rotors are semi floating. The buttons allow for some movement of the rotor , but at slow speed when they have heated up and expanded they will limit the amount of movement the rotor has. At high speed the forces generated will free the buttons up and you won't feel anything. You could do the full floating mod , but then you have to put up with noisy rotors ????

Posted on Nov 10, 2008

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