Braking Problems

Any ideas folks,

Got a '98 Blade, brakes were fine until one day over winter had to go to
work on it and got caught in the snow and grit. Left it in the garage
for a couple of weeks afterwards & the front brake was seized on. So
took the front wheel out & cleaned all the pistons up etc. Went out on
the bike & got terrible juddering under braking, when I got back I
looked at the discs to see they had been eaten away where the pads had
seized. So I've got a set of disc's off eBay & fitted them, same
problem, bought new pads same problem. Just checked the discs tonight to
see if they were warped & there is less than 1mm runout on them. I'm
stuck now any help would be appreciated.

 

<snip>

Did you torque the caliper mounting bolts properly when you fitted them?

 

Yep went round tonight with the wrench to make sure, spindle, the 2
bolts at the front of each leg & the calipers were all tight. Went out
for a spin & no better.

I'm happy to go out & buy brand new discs but worried I'll still have
same problem and £300 poorer

 

In uk.rec.motorcycles, Trevor amazed us all with this pearl of wisdom:

Bled the brakes? I can't see it helping tbh but it's the only thing left
isn't it?!

 

1mm run out is a lot.

Right, here's what you need to do. Take off the discs completely from
the wheel. Using a decent wire brush (and maybe a scraper, but be
careful) remove all the corrosion from the disc mounting faces on the
wheel hub. It only takes a few thou of corrosion/old paint etc to
cause a lot of run out at the disc edge.

Clean the mounting faces to a nice shine, then a very light smear (and
only a smear) of coppaslip on the faces and remount the discs.

I suspect that will solve the problem.

 

Wheel bearings? I thought of a few things, but got reading a book and
forgot most of them.

 

In uk.rec.motorcycles, Muck amazed us all with this pearl of wisdom:

Never had that when I've had a wheel bearing go. I just tends to make
squealy noises for a while and then give up completely after much
crunching for a mile or two.

 

Thanks, that's tomorrow evening planned out then, I'll report back.