nsr front brake!HELP!

nsr125.98 · Borekit Bruiser Joined: 19 Mar 2004 Karma :

i was riding home from work today on my 98 nsr and noticed that the handle bars were wobbling, which i thought was unusual. when i look at the front brake caliper it moves side ways!
can someone please tell me whats wrong with my bike as ive only had it 2 weeks,
thanks Gary

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

The caliper is a floating caliper. You should be able to move it from side to side, but it will probably take a small amount of force.

The disk should not move from side to side. If it does then it is probably warped, but you would probably feel the front brake lever pulsing when braking, and the bike would not slow down smoothly.

If the front end is vibrating / oscilating then it is probably just the front wheel out of balance.

If the whole wheel is moving from side to side then it is probably the front wheel bearings that are gone. Check for any play in the front wheel (get someone to hold the front end of the bike off the ground, the you hold the front wheel at 3 o'clock and 9 o'clock and try and rock it, and see if you can feel a click).

It is also possible that the front wheel is buckled, but this takes a fair amount of force.

All the best

Keith
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nsr125.98 · Borekit Bruiser Joined: 19 Mar 2004 Karma :

Thanks for the quick reply Thumbs Up

the actual caliper moves when im moving but not braking and the handlebars move slightly from side to side, also it pulses when i am breaking hard. thanks again for the help,
Gary

nsr125.98 · Borekit Bruiser Joined: 19 Mar 2004 Karma :

i drove it to work today and the whole bike was shaking if i went over 25mph, got it checked and turns out that the rear wheel bearing had gone, the back wheel could move sideways Shocked

.
anyway a couple of hours work and a tenner later its like new.
thanks gary

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

That explains the handling, but not explain the caliper moving around. Check the front disk, and check the front wheel bearings as well. If the bike hasn't been used for a while, and is then used again that seems to be a prime time for them to fail.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing