ZZR600 jerky front brakes

[Wonko The Sane]

My bike had a service a while ago and I asked the guy doing it what might be causing the jerkyness in the front brake. (present since buying it)

I've been told that it's probably just the disk not being perfectly flat but it's been annoying me lately so I'm wondering what can be done.

The calipers are the standard upgrade to the ZZR being nissin (think from a fire blade)

Should I start replacing rotors in the hope of resolving it or just get over it?

It doesn't affect braking performance, just not as smooth as could be when drawing to a stop unless you ease off and allow the rear to bring the bike to a stop.
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[SteveZZR]

Use a socket to tighten a nut and bolt through the semi floaters and spray with brake cleaner as you do. Should sort it

And might as well get Nissins done whilst you're at it

[Wonko The Sane]

It has nissins on and everything seems to be tight.

The mechanic checked everything over while fitting new pads during it's last service and couldn't find anything wrong which is where the conclusion that the rotor isn't constant thickness came from.
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[ashfieldrob]

Warped discs, had it on my zx9.
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[sickpup]

It could be warped discs, it could be an incompatibility between discs and pad material. It could even be down to the front tyre having uneven wear so a few things to check up on.

[c_dug]

If you suspect the disks are warn or warped and you have a manual for the bike it should list the acceptable limit for the disks, a dial gauge certainly isn't the cheapest tool you'll ever buy but it is cheaper than replacing the disks if they are fine.
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[garth]

[SteveZZR]

[Wonko The Sane]

Thanks, will look into that.
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[Ariel Badger]

This mechanic of yours.....Did he not put a DTI on the disk and check it for runout? Time to get a better mechanic IMHO.
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[Wonko The Sane]

I don't know if he did or not, I was abroad while he was servicing my bike.

There were a number of things I was having him look into doing while he was servicing it but I presume he did.

What I understood from him was that my disk might have a slightly wider bit somewhere on it, but he could have been trying to explain run-out and I wasn't understanding.

My mechanical knowledge is classic car / old car based
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[Kickstart]

Hi

My experience with trying to use a dti on the ZZR600 front disks was not good. Not sure if other than at the extreme edge of the disk there is a path the whole way round that isn't interrupted by a hole in the disk.

All the best

Keith
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[Wonko The Sane]

[ZedPowered]

Did the bobbin release thing from the video on my ZX6R recently. Pretty sure they are the same discs. It does not take that much effort to move the bobbin so any bolt will be fine. I put a slither of red rubber grease on the bobbin to lube it a bit. Seems to have worked fine, got rid of my jerky braking.

PS i miss my ZZR. Such good bikes.
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2011 ZX10R in Green

[Wonko The Sane]

That's what I'm thinking, except I don't seem able to get the bobbin to move!
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[SteveZZR]

[Wonko The Sane]

I've dowsed it in brake cleaner!

As it's a disk that's been kicking around and not on the bike I even tried WD40 (i know, normally it's not allowed anywhere near brakes) but still nothing.
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