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Bikes, Hints'n'Tips => Fazer 1000/FZ1 corner => Topic started by: solorider on 22 July 2013, 04:26:04 pm

Title: Just fitted like for like used brake discs
Post by: solorider on 22 July 2013, 04:26:04 pm
I have just fitted a pair of used discs on my bike, after fitting the right disc was touching the calliper and the left was perfectly central which was weird, in the end I had to space my right calliper inwards to fix the problem, the discs were fitted in the same way as they came off. Any ideas as to why this happened? 
Title: Re: Just fitted like for like used brake discs
Post by: JoeRock on 22 July 2013, 04:51:21 pm
Your wheel isn't fitted correctly, or the caliper/fork is bent - asuming the discs are good.
Title: Re: Just fitted like for like used brake discs
Post by: solorider on 22 July 2013, 05:16:49 pm
Everything looks good without any signs of accident damage, the bike tracks straight and is stable at all speeds.
Title: Re: Just fitted like for like used brake discs
Post by: unfazed on 22 July 2013, 11:56:06 pm
Are you sure the wheel is on the right way round. Check the direction arrow on the wheel
Title: Re: Just fitted like for like used brake discs
Post by: solorider on 23 July 2013, 01:24:34 am
Quote from: unfazed on 22 July 2013, 11:56:06 pm
Are you sure the wheel is on the right way round. Check the direction arrow on the wheel
Yes the wheel is on the right way around, to be honest I have always had some brake drag but since I have fitted the washers the drag has gone.
Title: Re: Just fitted like for like used brake discs
Post by: Ben Diesel on 23 July 2013, 12:22:39 pm
I don't think this is disc warping, that tends to show itself as vibration through the brake lever.


Sounds like one of your discs has become 'dished' - this tends to happen when the pistons in one side of the brake caliper stick in the bore and fail to extend properly when the brake is applied. The extra push from the pistons on the working side force the pad against only one side of the disc causing it to dish inwards or outwards.


Check to see if your pads are wearing evenly - that's another tell-tale sign.


I had this happen on the VFR a few years back. It became so bad, the edge of the disc started to eat into the inside of the fork stanchion. Had to buy new discs.


EDIT: sorry, just noticed they were fitted to another bike so you will not be able to check pad wear.
Title: Re: Just fitted like for like used brake discs
Post by: sadlonelygit on 23 July 2013, 12:48:59 pm
take the 'funny' disc back off and put a square edge against it to see if it's dished or not. had a mate with a hond@ fireplace with just the same problem!
Title: Re: Just fitted like for like used brake discs
Post by: b1k3rdude on 23 July 2013, 05:23:14 pm
Ive onlyt had this issue once, when I mis-fitted the spaces on the front wheel.
Title: Re: Just fitted like for like used brake discs
Post by: unfazed on 23 July 2013, 06:13:45 pm
I had dished  disk and it was a right pain trying to figure out what was causing the pads to over heat and fade. I also went to add washers and it was then I noticed the disc looked wrong.When I removed the wheel and put a flat edge accross it, there was  a  serious dished effect. See pic
Title: Re: Just fitted like for like used brake discs
Post by: b1k3rdude on 24 July 2013, 09:32:13 am
The breakers who sold you those disc's should be shot, drawn and quartered...!!! Get a full refund including postage in both directions, fuckers.
Title: Re: Just fitted like for like used brake discs
Post by: solorider on 24 July 2013, 12:34:34 pm
There is no sign of dishing on the disc, and the bike passed its mot today with no advisories
Title: Re: Just fitted like for like used brake discs
Post by: b1k3rdude on 24 July 2013, 02:18:51 pm
Quote from: solorider on 24 July 2013, 12:34:34 pm
There is no sign of dishing on the disc, and the bike passed its mot today with no advisories
Hmm if its the same disc as in the image then you must have bolted it down in the opposite sequence to to counter act the dishing...??!!