bent rotors

[boomer]

ok.. so i've had shit brakes since i bought the bike, a k7 1000.

so i replaced the lines with hel braided lines which made 'em a bit better but i seem to have warped rotors now.

So i've asked the shop and they measiured 'em and said yeah they're spotted and warped; he didnt tell me by how much.

So they asked Suzuki NZ to come to the party and a week later Suzuki says..... the rotors don't warp!

umm.. ok i say to the shop.. so i'm a bit bemused.. your saying theyre warped and suzuki says thats not possible.. unless they've been banged. The bikes mint and never been nocked.


So anyways Suzuki NZ tell the shop that they can fix them easily enough.. by taking the bike out and heating up the brakes & rotors .. i.e ride the bike hard with the front brakes applied... as... and here's the punch line... the rotors/steel remember there original shape and will go back to being 'stright'....


anyhows.. anyone with a little knowledge able to comment? me.. im bemused, it don;t take a lot but meh.. the bikes got 8,000 k's on it and has been ridden by a nannnnaa...

[merv]

I reckon Suzuki NZ are pulling your tit. If steel warps usually heat only makes it worse as in it relaxes and takes on that natural position anyway being the warped shape. Sounds to me like faulty from the start and they should replace them without argument.

[riffer]

Yeah, I agree with Merv. Sounds like dodgy rotors.

Make a warranty claim dude.

[cowpoos]

you buy the bike from colmans?

[Defiant]

I reckon Suzuki NZ are pulling your tit. If steel warps usually heat only makes it worse as in it relaxes and takes on that natural position anyway being the warped shape. Sounds to me like faulty from the start and they should replace them without argument.

I agree and have to say that I know that Suzuki a shitting you with that....I specialize in brakes and servicing on both cars and bikes we skim discs(cars only...lol.), cross drill etc, and i have come across almost every cause and case of damaged brake disc.......heat them up and they'll return to thier original shape my arse!!! They are either faulty or you've been hard arse on the brake with them.....Either way you can tell the cause in both cases.....call suzuki back they owe you some brake discs....

[Defiant]

get the shop to take em off and send them to me....i'll give you a written report of the cause if you like.....pm me..

[DEATH_INC.]

So anyways Suzuki NZ tell the shop that they can fix them easily enough.. by taking the bike out and heating up the brakes & rotors .. i.e ride the bike hard with the front brakes applied... as... and here's the punch line... the rotors/steel remember there original shape and will go back to being 'stright'....

Bwahahahaha that's the funniest thing I've heard for a long time!!!

[boomer]

hey guys,

yeah i got it from Colemans Poos. I'll take it in tomorrow(again) and let the bloke do his fango dango and watch him measure them afterwards. If they're still bent ( foookin unlikely that witch kraft will straighten 'em ) then i'll be in touch Defiant.

Cheers for the advise guys.. and i knew i'd be able to make you laugh! cos i did at the shop and matey boy took great offense

apparantly they did put a claim in and suzuki told the shop .. rotors don't warp!

if i get no joy tomorrow i'll put it in writing to Suzuki and come have a chat Defiant.. cos the last thing i wanna do is fork out $800.


i'm still bemused.. Suzuki on one hand tellin me they don't warp and Colemans tellin me they are... ahhahahahahahah oh for a simple life

[MSTRS:Me]

Rotors will warp as aresult of (excessive) heat. If, like me, you have done a track day and just parked up after a session, the heat in the discs is retained in the caliper area and the uneven cooling of the disc will leave it warped. And no, they will not straighten of their own accord or by any other method.
This worked well enough for me... http://www.kiwibiker.co.nz/forums/sh...postcount=2623

[MotoGirl]

apparantly they did put a claim in and suzuki told the shop .. rotors don't warp!

If I remember correctly, dad had warped rotors on his Busa about a year ago.

[boomer]

Ok.. so the bike went back today to get the black magic treatment. I asked how far out the rotors were and he said one was worse than the other but couldn't remember the figures.

I asked him to measure the tolerance before doing his stuff and then measure 'em afterwards.

The front wheel comes of and low and behold they're not out of tolerance, either of 'em. They were checked on the bike last time, not on a work bench. The head bearings needed a tweak and the pads got replaced and the front tyre was out of balance ... again.

So the bike actually stops now; I'll let ya know if i get more pulsing.


What a fiasco!!!


The tyre story...

A while ago, Ray Clees Dyno'd the bike and it nearly wrecked his machine as the rear was out of balance. It already had 80gms on it.

So back to cycletreads and they send the tyre to the distributor and ask for a refund. They say no. I lost my toys and cut a long story short, Cycletreads give me a new set of Pilot Powers 2ct's ( as well as the rear i wrecked over 3 weeks whilst they checked with the distributor )

Its this set of tyres that Colemans tell me are out of balance.... do i cry or laugh?!

[Defiant]

Geeeeeeeeze!!......what a drama.....are you sure the floor sweeper aint the one doing the checking......and the work.......you must have a realllllllllllllllllllllllllllllllllllllllllllllll llllllly long fuse.....keep us up to date this is gettin' an interestin' read....maybe after the tyres they'll say the chain is out of balance...ahahahaha........I sympathize with you boomer....no-one likes their ride of the road...

[Toast]

Rotors will warp as aresult of (excessive) heat. If, like me, you have done a track day and just parked up after a session, the heat in the discs is retained in the caliper area and the uneven cooling of the disc will leave it warped. And no, they will not straighten of their own accord or by any other method.
This worked well enough for me... http://www.kiwibiker.co.nz/forums/sh...postcount=2623

While your logic is correct, I don't think that would be a common cause of the rotors warping, given that my race bike and many others in this country have done more track km's than Boomer's thou' and there seems to be very few complaints from racers of their discs getting warped from sitting hot after a session.

Having said that, I'm ultra anal and intentionally do very little braking on the cool down lap.

[Max Preload]

Rotors warp because they're held at elevated temperatures for periods and become annealed which allows the inherent internal stresses from post-casting casting forming and machining to warp the rotor.

[MSTRS:Me]

While your logic is correct, I don't think that would be a common cause of the rotors warping, given that my race bike and many others in this country have done more track km's than Boomer's thou' and there seems to be very few complaints from racers of their discs getting warped from sitting hot after a session.

Having said that, I'm ultra anal and intentionally do very little braking on the cool down lap.

Precisely...trackdayers tend not to think of this (or get a warm-down lap)