Front end vibes...
Discussion
Bit of an odd one this ... my Fireblade has M4 calipers with standard brembo pads, Brembo ORO discs and a Brembo RCS19 MC with braided lines ... they feel superb as expected.
When braking hard from speed. I.e. motorway to town I get vibration through the front end and I can't work out what it could be... the lever stays constant, as do the brakes and in fact I simply thought it was the road surface through the tyre ... at low speeds it is fine.
A few months ago the forks were rebuilt, wheel bearings replaced as were the discs and pads and it didn't have this vibration.
Stripped and cleaned the brakes last night and it is still there.
Not sure where to go from here? Any ideas?
I'm wondering if the head bearings need looking at ...
When braking hard from speed. I.e. motorway to town I get vibration through the front end and I can't work out what it could be... the lever stays constant, as do the brakes and in fact I simply thought it was the road surface through the tyre ... at low speeds it is fine.
A few months ago the forks were rebuilt, wheel bearings replaced as were the discs and pads and it didn't have this vibration.
Stripped and cleaned the brakes last night and it is still there.
Not sure where to go from here? Any ideas?
I'm wondering if the head bearings need looking at ...
Could be wrong as you keep that blade so clean, but I've had something similar and it turned out to be a couple of the bobbins where stuck in place on the disc. Get a bolt and nut in it and give it a turn, freed it off and the problem went away. Could be worth a check as it's an easy fix ?
Tommo13 said:
Could be wrong as you keep that blade so clean, but I've had something similar and it turned out to be a couple of the bobbins where stuck in place on the disc. Get a bolt and nut in it and give it a turn, freed it off and the problem went away. Could be worth a check as it's an easy fix ?
Bobbins are fine ... as you rightly say its kept mint (most of time) and the brake discs have only done 2000 miles since replacement.
Bikesalot said:
I'd be checking the head bearings.
Id be doing the same. My second Mille did exactly this. Had discs checked, skimmed and still doing it. Tried pads, still doing itAt the point of selling and checked headstock. Turned out to be a knackered bearing and a slight bit of movement under hard pressure
Double check all the disc bobbins are free.
Also, if you have had wheel and brakes all off, are you sure you got the forks lined up before pinching the wheel up?
Can give similar results if you do it wrong, seemingly fine in steady riding, but at higher loads, front end wobbles.
It's easy to do and there are YouTube vids on it, basically needs compressing without using brakes to make sure the axle is central etc.
You may know all this, but if not, worth checking.
Also, if you have had wheel and brakes all off, are you sure you got the forks lined up before pinching the wheel up?
Can give similar results if you do it wrong, seemingly fine in steady riding, but at higher loads, front end wobbles.
It's easy to do and there are YouTube vids on it, basically needs compressing without using brakes to make sure the axle is central etc.
You may know all this, but if not, worth checking.
trickywoo said:
If you do the bearings its worth looking at koyo tapered ones as the upgrade doesn't cost much.
Honda tried fitting taper roller steering bearings once before on the blade, and then quickly reverted back to ball races. I'd personally stick to quality (preferably OEM) ball races.
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