Strange mark on disc

Gemini · Post by **Gemini** » Thu Jul 05, 2007 3:44 pm

hi guys, recently noticed on my front left disc that a slight part on the outer section of the disc is rusty which makes me think not all of the pad is touchin the disc.

the bike stops fine, not pulsing in the lever. would i be right in thinkin that one of the pistons is sticking slightly?

gem

Post by **masterofinsanity** » Thu Jul 05, 2007 4:08 pm

is that another job on my list?

Gemini · Post by **Gemini** » Thu Jul 05, 2007 4:12 pm

if u dont mind. fancy comin over to mine on weekend and doing it all?

gem

Post by **rene** » Thu Jul 05, 2007 4:15 pm

how do you mean a slight mark all the way round the disk? or just a dark mark were the pad was tutching?

Gemini · Post by **Gemini** » Thu Jul 05, 2007 4:22 pm

on the outer side of the disc, there is rust all the way around as if the pad is only touchin the inner part of disc

gem

Post by **masterofinsanity** » Thu Jul 05, 2007 4:25 pm

i'll have a look the weekend mate.

Post by **rene** » Thu Jul 05, 2007 4:29 pm

your bike has 6 pots right? might be the bottom piston not tutching properly

Post by **masterofinsanity** » Thu Jul 05, 2007 4:35 pm

might be rust from not using the bike?

Post by **Jamz** » Thu Jul 05, 2007 5:25 pm

Aren't the pistons inline?

There should be a bit on the very outer edge of the disc that the pads won't touch.

Some bikes I've had, the disks rusted up instantly if it was stood in the rain, but always worked fine the second I rode it!

I think that was just the type of steel used?

It was probably my Aprilia AF125 that was the worst offender, but I think at least one of my VFR's did the same...

Gemini · Post by **Gemini** » Thu Jul 05, 2007 6:42 pm

my mistake, the rust is on the inner half

and yeah 6 pots

gem

RedexRobB · Post by **RedexRobB** » Fri Jul 06, 2007 3:25 pm

I had this on my rear disk Gem, i renewed the pads a while ago for the MOT and its now gone. No matter how much i used the rear brake before i put new pads on it still wouldnt clean up, but its fine now. I can only imagine the new pad has either worn into the shape of the disk (but the old one had loadsa meat left on it) or i loosened up the piston, who knows

Post by **masterofinsanity** » Fri Jul 06, 2007 3:28 pm

as robB would suggest, could be that the disc has worn unevenly and now you have changed the pads the new pads are completely flat so will only touch certain parts of the discs, they will wear in but you may need to get new discs depending how bad they are?

RedexRobB · Post by **RedexRobB** » Fri Jul 06, 2007 3:31 pm

Yeah i was thinking on a new disk, i think they go for about 40 or 50 quid on ebay, not even that i dont think

but soon as it cleaned up it thought i might as well leave it. Might replace it when I give the 7R big a major service in September.

Gemini · Post by **Gemini** » Fri Jul 06, 2007 9:51 pm

just ran my finger over disc and there is a slight ripple but nowt major, and also when i took old pads out they were worn odd.

so can i assume that as my new pads bed in they will fit the disc and this rust will disappear? i have only done 2miles round the block with new pads

gem

Post by **gubbs** » Fri Jul 06, 2007 9:57 pm

I'd deffo get a biopsy mate.

www.zxrworld.co.uk

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