ScootRS front disc brake bearing collapse

[spud]

I noticed a slight wobble on the front end of my GP (got scootrs outboard disc fitted for 2 years), which gradually got worse riding back from woolacombe at the weekend.
Had a look when we stopped for fuel & couldn't see what the issue was. Did another 20 or so miles & whilst riding through some road works (luckily at slow speed) the bearing just collapsed. When i took the external washer off, there was a seal (disintegrated) & the ball bearings just fell out.
So, as there is no grease nipple on the hub, what is this seal actually doing & has anyone else had the same issue with the bearing collapsing?

cheers
Spud

[johnnyXS]

the seal will be a dust seal to exclude the road dust and crud from getting into the bearing and damaging it.
The bearing is probably a generic bearing and should have all the sizes and configuration stamped onto the cage . You should be able to replace it with a good quality British made metric bearing

[spud]

I have removed the axle & i have managed to drift out the bearing on the LHS.
Problem is the bearing on the other side has fallen apart & all that is left in the hub is the outer piece, which sits flush with the middle of the hub.
Any idea's how i would get that out, anyone?

[dickie]

One of two options spring to mind that I've used on r6 wheel bearings as they are recessed so can't be drifted out:

1. Dremmel; not sexy and takes an age if you do it properly but it works

2. Internal bearing puller with knife edges; much better but you'll need to buy a puller kit. Cheap ones are fine for home mechanics like me and cost about twenty quid.

[steve t]

Hi if the bearing race is in the recess with no way of getting a drift behind it an old trick is to put maybe 3 or 4 tacks of weld on the race when it has cooled it should drop out because of the shrinking effect of the weld I have used this method many times only problem is you need access to a welder hope this helps