I have a 1997 600 bandit and I have replaced the front discs with new kagazumi discs and new pads off ebay,my problem is there is a squeel coming from the feft disc (viewed from on the bike) I have since replaced all the piston seals,cleaned and re greased the calaper sliders fitted new slider gromits on both calapers and gave them both a good clean. The discs were troqued to the correct seting and in a criscross sequence,and the pads have been coppersliped. I have been told that it might be a problem with the front spindle?

Thinking more about your issue. Noting that you have put new discs on and new pads. Failing it being the pads. You may find that the discs on your particular bike unfortunatley hit what is known as the naturally occuring resonating frequency.

What that means - a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object. In your case the combination of bolts used to mount the disc, the disc pad pressure applied, the speed of the wheel spinning, the material used to make the disc, the pad material. At certain speeds the wheel may well be spinning at just the right frequency ( number of spins) to hit this natural resonant frequency. Hence causing the discs to being to sing and squeel.

Ever see in cartoons when the fat lady sings and breaks the wine glass or a window. This is caused by the frequency of her voice hitting the resonant frequency of the glass. The glass will actually beging to vibrate harder and if applied long enough will break. Similarly this may be occuring to your bike discs where they have just the right combinations of torque, wheel spin etc to start to vibrate abnormally to cause them to squeel at certain speeds. you will probably find that at some speeds thay will not squeel. My bike for example when I had the stock factory fit pads on, at 70 mile an hour when apllying the brakes made no noise at the front disc, however different story at 25 mile an hour they would hum for about three seconds and then stop humming as the wheel slows down to 15 mile an hour.

I am assuming you have checked all setup of brake is correct. First thing is change your brand of pads, I know they are new, but not all pads are the same. The ones you have may well be made in such a way ( slightly harder than other brands for example) to be just the final item that is causing your discs to hit their resonating frequency and hence squeel. Thinking more about your issue. Noting that you have put new discs on and new pads. Failing it being the pads. You may find that the discs on your particular bike unfortunatley hit what is known as the naturally occuring resonating frequency. What that means - a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object. In your case the combination of bolts used to mount the disc, the disc pad pressure applied, the speed of the wheel spinning, the material used to make the disc, the pad material. At certain speeds the wheel may well be spinning at just the right frequency ( number of spins) to hit this natural resonant frequency. Hence causing the discs to being to sing and squeel. Ever see in cartoons when the fat lady sings and breaks the wine glass or a window. This is caused by the frequency of her voice hitting the resonant frequency of the glass. The glass will actually beging to vibrate harder and if applied long enough will break. Similarly this may be occuring to your bike discs where they have just the right combinations of torque, wheel spin etc to start to vibrate abnormally to cause them to squeel at certain speeds. you will probably find that at some speeds thay will not squeel. My bike for example when I had the stock factory fit pads on, at 70 mile an hour when apllying the brakes made no noise at the front disc, however different story at 25 mile an hour they would hum for about three seconds and then stop humming as the wheel slows down to 15 mile an hour. I am assuming you have checked all setup of brake is correct. First thing is change your brand of pads, I know they are new, but not all pads are the same. The ones you have may well be made in such a way ( slightly harder than other brands for example) to be just the final item that is causing your discs to hit their resonating frequency and hence squeel.