Can bent brake discs be straightened ? - SV650.org

09-12-05, 09:32 PM

Right, looks like a front disc on my ZX-6R may be a tad bent/wobbly... the bike shakes like hell when braking at high speeds, and there is an ever so little pulsing from the brake lever....

Im taking a guess its the discs, but I have been told it could also be the baring for the steering... its a tad loose anyway.. but I always hope for the best.. and prepare for the worst

Sadly new discs for the front are in the £250 + area..... but if the old ones can be put back flat/straight.. then at least there may be some hope!

BillyC · 09-12-05, 09:46 PM

I wouldn't have thought so, especially given the forces and temperatures they have to endure!

Biker Biggles · 09-12-05, 10:05 PM

My 6r did a set of head races and a front wheel bearing so check that too.
Ar'nt the discs semi floating?Mine used to make a whirring noise when braking from speed caused by the discs moving on their mountings.Check the mountings are not seized.

09-12-05, 10:18 PM

Im pretty sure they are semi-floating.. but I have no idea what that is!!!

no problems with the noise.. just the fact that it shakes... no problems below 30mph, at anything higher it starts to shake, but the pulsing in the brake leaver is hardly noticable, and its only when I use 1 finger I can feel it do that... will probably know in a few weeks time anyway.. only another 500 miles to its major service

09-12-05, 10:28 PM

Quote:

Originally Posted by BillyC

I wouldn't have thought so, especially given the forces and temperatures they have to endure!

Quite. I wouldnt even bother looking. You can get a good set for a couple of hundred notes

09-12-05, 11:11 PM

Discs can be straightened but it requires the right tools to do it. Cost depends on who does it but I get them done for £30 a pair which is a hell of a lot better than buying new.

Whether a particular disk can be straightened or not depends on it the metal has stretched, normally it is possible. I have had 4 pairs done and only one disc out of 8 could not be done, this had been badly trashed.

You can send them to Hagon (the shock absorber people) and they can do them or find a M/C frame engineer near you.

I use a guy near Aldershot.

10-12-05, 05:04 PM

Well, I had a quick read up on the different types of discs you can have..
found out that semi-floating discs can occasionaly stop being semi-floating in a bad position.. so squirted some contact cleaner around the rivets.. and it seems to be better... though will need to do longer testing tomorrow

Wanted to take the front wheel off the bike, and give everything a good clean.. but my part hasnt arrived to fit the axle yet

So looks like Biker Biggles had a good point

cheers for the help!

Sid Squid · 10-12-05, 07:22 PM

Yes.

10-12-05, 07:34 PM

will report back tomorrow after further testing... if I still think the buggers are bent, I shall be pestering for more info! lol

11-12-05, 03:03 PM

Still vibrating

Looks like I better start saving for some replacements

09-12-05, 09:32 PM	#1
valleyboy Guest Posts: n/a	Can bent brake discs be straightened ? Right, looks like a front disc on my ZX-6R may be a tad bent/wobbly... the bike shakes like hell when braking at high speeds, and there is an ever so little pulsing from the brake lever.... Im taking a guess its the discs, but I have been told it could also be the baring for the steering... its a tad loose anyway.. but I always hope for the best.. and prepare for the worst Sadly new discs for the front are in the £250 + area..... but if the old ones can be put back flat/straight.. then at least there may be some hope!

09-12-05, 09:46 PM	#2
BillyC Moderator Mega Poster Join Date: Nov 2003 Location: The exiles of Kent Posts: 2,184	I wouldn't have thought so, especially given the forces and temperatures they have to endure! __________________ SV650 K3 - Gone. Now a member of the SV650.org Kawasaki brigade!

09-12-05, 10:05 PM	#3
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	My 6r did a set of head races and a front wheel bearing so check that too. Ar'nt the discs semi floating?Mine used to make a whirring noise when braking from speed caused by the discs moving on their mountings.Check the mountings are not seized. __________________ On a clear day we stand there and look further than the ordinary eye can see.

10-12-05, 07:22 PM	#8
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Yes. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

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09-12-05, 10:18 PM	#4
valleyboy Guest Posts: n/a	Im pretty sure they are semi-floating.. but I have no idea what that is!!! no problems with the noise.. just the fact that it shakes... no problems below 30mph, at anything higher it starts to shake, but the pulsing in the brake leaver is hardly noticable, and its only when I use 1 finger I can feel it do that... will probably know in a few weeks time anyway.. only another 500 miles to its major service

09-12-05, 11:11 PM	#6
Patch Guest Posts: n/a	Discs can be straightened but it requires the right tools to do it. Cost depends on who does it but I get them done for £30 a pair which is a hell of a lot better than buying new. Whether a particular disk can be straightened or not depends on it the metal has stretched, normally it is possible. I have had 4 pairs done and only one disc out of 8 could not be done, this had been badly trashed. You can send them to Hagon (the shock absorber people) and they can do them or find a M/C frame engineer near you. I use a guy near Aldershot.

10-12-05, 05:04 PM	#7
valleyboy Guest Posts: n/a	Well, I had a quick read up on the different types of discs you can have.. found out that semi-floating discs can occasionaly stop being semi-floating in a bad position.. so squirted some contact cleaner around the rivets.. and it seems to be better... though will need to do longer testing tomorrow Wanted to take the front wheel off the bike, and give everything a good clean.. but my part hasnt arrived to fit the axle yet So looks like Biker Biggles had a good point cheers for the help!

10-12-05, 07:34 PM	#9
valleyboy Guest Posts: n/a	will report back tomorrow after further testing... if I still think the buggers are bent, I shall be pestering for more info! lol

11-12-05, 03:03 PM	#10
valleyboy Guest Posts: n/a	Still vibrating Looks like I better start saving for some replacements