Brake Disc Blueing

[wilsonsjw11]

What is the likely cause of "blueing" on the brake disc.This has only started to happen after 3-400 miles.
Pads are original Vesrah type not Kevlar.
Regards
Steve

[Charlie]

Are we talking new discs here, or the originals ?

[steve.w]

sounds like calipers are sticking

[z1bman]

callipers sticking ? brake pad tight in calliper? pattern brake lever not allowing master cylinder piston to retract fully ? master cylinder over filled with fluid

[wilsonsjw11]

Thanks for the answers, calliper tight i.e. not floating?more copper slip required?
Master cylinder filled to line only.
The equipment is all original but rebuilt on a 73 Z1 including NOS M/cylinder.
Can the blueing be removed with a very fine grit paper once the fault has been rectified?
Regards
Steve

[ZedHead]

Thanks for the answers, calliper tight i.e. not floating?more copper slip required?
Master cylinder filled to line only.
The equipment is all original but rebuilt on a 73 Z1 including NOS M/cylinder.
Can the blueing be removed with a very fine grit paper once the fault has been rectified?
Regards
Steve

Use red rubber grease on the sliders. Copperslip is is good for the back of pads to help stop squeal

[steve.w]

the blueing will go away itself with use

[pertonpc]

Bill Newman off here recommends ASTONISH kitchen cleaner for smartening up discs.

It's sold for cleaning up stainless and copper pans and sinks in the kitchen.

I got some from LAKELAND in Shrewsbury - think they have stores near you Steve.

re. caliper floating I would use light silicon lube on the calliper shaft bolt and make sure the O rings are in correct position and not worn flat anywhere.

A heavier grease will tend to stick up the floating action after a while.

From Mark

[DogsbolloxofZ1B]

Steve,
You've been abusing the old girl, you're meant to be running her in carefully

[wilsonsjw11]

Steve,
You've been abusing the old girl, you're meant to be running her in carefully

Mike,
The £100.00 bikes again

[wilsonsjw11]

I'm pretty sure the O rings are in the correct grooves on the shafts as this problem has only just arisen after nearly 400 miles of running in.Can someone please post the correct position of these items.
Regards
Steve

[redzee]

Just had exactly the same problem with my RD Yam (sorry for swearing guys). Small return/bleed back hole in mastercylinder was blocked with gunk maintaining slight pressure on the piston. Cleared hole with a small pin and it's now working fine, but I too now have a blue disc and I'm not sure how the heat has affected the mechanical properties of the disc material??????
I assume your brake system will be of similar design?
Col

[jimmock]

Definitely sounds like a binding brake causing excessive heat.

[wilsonsjw11]

After stripping the caliper down I found one of the caliper shaft O rings split and jamming the smooth sliding action of the unit.When the caliper was rebuilt I used a NOS rebuild kit which included new O rings but maybe the the kit was a little too OLD.
After buying 4 new O rings from Zpower at £6.50 each I noticed that they were a fair bit thinner than the orignals but now its rebuilt and working as it should.
Thanks for all earlier suggestions.
Regards
Steve

[pertonpc]

Great news Steve,

I have some new O rings for Z650, 900 and early 1000 if anyone needs those.

£7.99 for the set of 4 - but I think the Z1 item is a different part code - although it could still be the same size from what I have seen.

Cheers from Mark