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Help needed with front brakes

Dalmatian46

Dalmatian46

Joined Jun 2011
67 Posts | 0+
Northampton
Hi

My RSV started to loose power and found the front brakes were locked on, so i removed the pads and calipers and found the disc was rubbing against the caliper.cleaned up the calipers and checked everything was ok then re fitted both caliper to find the disc is sat right against the caliper on the outer side and will cause the same issue.

This is happening on both front calipers and both in the same place the outer side of the calipers?

The calipers are the 4 pad type

Im guessing its warpped discs but its just very odd.

Has anyone had this fault or can someone shed some light on it for me pls :confused


IMG_1148.jpg
 
hi mate , i think i remember someone had the same problem some time ago,and i think it was because they got a new tyre and the wheel was put on the different way round if that makes sense. i may be wrong but i think thats what was causing it on their bike'
 
Cheers mate

I just checked and tyre and wheel facing correct way.

Thanks anyway.
 
Are the 'buttons' that allow the disk to float all free?

Can you see any warping of the disc if you hold a straight edge against it? Is it likely that both discs would warp?

Is the rubbing consistent for the entire rotation? or does it just scuff the caliper at one point?

Rob :)
 
Are you sure you have fitted the front wheel correctly ie: inserted the spindle & spacer correctly, done up the L/H pinch bolts, done up the spindle nut to the correct torque. Then do up the R/H pinch bolts to the correct torque, then UNDO the L/H pinch bolts, pump the forks up & down several times to make sure everything is in the correct position, then do up the L/H pinch bolts to the correct torque.
If you don't do it like this it can cause the calipers to rub on the discs & it can also blow your fork seals.
 
I had a new front tyre approx 300 miles ago by a local bike tech and I doubt he followed that procedure,so I'll follow your procedure when wheel goes back on.

Thanks
 
Dalmatian46 said:
I had a new front tyre approx 300 miles ago by a local bike tech and I doubt he followed that procedure,so I'll follow your procedure when wheel goes back on.

Thanks
Click to expand...

Sounds a lot more likely to be the cause than warped discs. Let us know how you get on.

Rob :)
 
Have the discs been off?...and been refitted the wrong side out?
They have an offset which would cause this.
 
Tifa said:
Have the discs been off?...and been refitted the wrong side out?
They have an offset which would cause this.
Click to expand...

I've not tried it but I'm pretty sure the calipers wouldn't fit at all if the disc 'holder' was attached the wrong side out to the wheel. Would the discs even attach to the wheel wrong side out?

Rob :)
 
Read the thread and had a look at mine....... I'd have thought the discs would need to be pretty badly warped and also unusually evenly warped around the circumference to do that. Looking at nikfubar's comments above, I'd agree it sounds more probable the distance the forks are apart would be the culprit. Spacer, spindle length etc. Was the correct spacer put in when the wheel off to change the tyre? Don't know what the fork distance should be but would be worth checking. Maybe someone has the proper dimensions. Mines a 2007 model so probably no use to compare.
Another thought - when I was getting a spare set of wheels for wet tyres the earlier wheels were narrower that the later ones. Have you changed your wheels?
 
apostrophe said:
I've not tried it but I'm pretty sure the calipers wouldn't fit at all if the disc 'holder' was attached the wrong side out to the wheel. Would the discs even attach to the wheel wrong side out?

Rob :)
Click to expand...

Yeah....Windy (AF1) did this when he had his wheels powdercoated.....there was a bit of head scratching in his shed that afternoon...;)
 
Thanks for everyones, input so far Ive checked

1 discs on correct way,condition and for warped all ok then Span wheel and discs touched constantly on outer side of calpiers on both sides.

2 Tyres on correct and wheel on correct (arrows pointing in direction of travel,span wheel and no signs of damadge.

3 carried out the sequence for front wheel removal 3/4 time and this helped now only a slight rubbing.

4 checked condition of wheel spacer and axle pin all sems ok the o/s top hat spacer is 18.6 mm.

IMG_1154.jpg

IMG_1155.jpg

It just seems as though its a spacer issue,im gonna see if theres one on fleabay
 
In pic 1, I don't like the look of the spindle, on mine (granted Ohlins) the spindle disappears into the leg completely and goes fully flush, yours seems to be hanging out a little still. As the spindle is the spacer.. that worries me. IF i'm right, you would be getting (looking from the BACK) rubbing on left caliper on left edge (outer) .. im not sure about the right side, it could warp the legs in slightly .. and i canna figure what would happen.

what we sayin ;)
 
Last edited:
As said the spindle end is normally flush with the fork leg, just a thought has the bearing spacer been fitted (tube between the front wheel bearings inside the wheel)
 
I removed the spindle and checked it all seems ok,refitted it 2-3 times and gave it a bit of love to see if it would move to a more flush position but each time its max position was as in photo and sitting proud.

Bearings seem ok and the spacer in between looks ok,So next step is to remove bearings and check spacer.

If all ok its time to look towards getting a set of forks,and spindle (what skullface says makes a lotta sense) that or just machine a couple of mill of each calipers( this may fix my problem in the short term but dosnt give me the cause of the fault , which will just keep on bugging me).
 
perhaps someone with same bike could put a closeup of the spindle seating position, and you could do same.. if that is where the problem is.. you dont wanna be filing down calipers or mounts to solve it... trust me.
 
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