After 3 years, I've discovered, that my rear disc is not flat

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AndY1
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After 3 years, I've discovered, that my rear disc is not flat

I've never used my disc brake, so I didn't notice, but when I pull the rear brake while riding, the breaking force is very uneven and I can feel my fingers oscilating back and forth.

I guess it's been like that since new, because only in 1 years time from now, my first inspection for registration is due and I've never tested this.

So... where do I get a replacement disc? Is it proprietary Vectrix disc or is there an OEM disc so I can replace it next year, when I'll be replacing my tires?

Thank you for your replies!

HarryS
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Re: After 3 years, I've discovered, that my rear disc is not ...

I have the same issue. Contacted Vectrix. Apparently the disk is about $120 but never received a quote or follow-up email.

antiscab
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Re: After 3 years, I've discovered, that my rear disc is not ...

same problem here......i thought it was just me

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst 2 x TC Charger & MC
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Aircon
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Re: After 3 years, I've discovered, that my rear disc is not ...

same problem here......i thought it was just me

Ditto. How odd.

AndY1
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Re: After 3 years, I've discovered, that my rear disc is not ...

I figure, since Vectrix uses Brembo brakes package, that I could find a replacement disc on Brembo's web page. I did find something:
http://www.brembo.com/en/Moto/Moto-AM/Pages/Dischi.aspx
http://brembopads.com/En/Discs/Discs_Catalogue_Search.aspx

But Vectrix is not on the bikes list. I guess it's because it's pretty unknown company in the riding world.

Maybe it's the same disc as another scooter.

I'll try a contact form on their site:
http://www.brembo.com/en/Contatti/Pages/Contatti.aspx?Contact=05

Mik
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Re: After 3 years, I've discovered, that my rear disc is not ...

This information may be used entirely at your own risk.

There is always a way if there is no other way!

AndY1
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Re: After 3 years, I've discovered, that my rear disc is not ...

Thank you, but I've already looked at it and there's nothing there about the read disc.

Drew
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Re: After 3 years, I've discovered, that my rear disc is not ...

Just before you go and change the disc, check it's fitted the correct way round. On one side it has a machined recess - and on the other it does not. If fitted the wrong way round, it could give rise to brake disc wobble due to mis-alignment - leading to the symptoms you describe!

Drew

Drew

AndY1
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Re: After 3 years, I've discovered, that my rear disc is not ...

Thank you for your reply!

I'm not sure exactly how do I tell the difference, so I'll make a mobile photo later and post it here. Would you be able to tell from the photo if the disc is fitted the right way?

P.S.: Which side should have machined recess? Inside one or the outside one?

AndY1
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Re: After 3 years, I've discovered, that my rear disc is not ...

Ok, I just checked. The recessed middle is on the outside of the disc, but the recess is minimal. Less than a mm. The innerside is completely flat.

Drew
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Re: After 3 years, I've discovered, that my rear disc is not ...

Oh, ok it does look as though it's been fitted the right way round. The recess helps with clearance on the mounting bolts and caliper. If fitted the wrong way round (i.e. recess to gearbox), the disc pulls up to the mounting faces on the very minimal edge of the recess only and can cause two things;- 1) misalignment of the disc to caliper (axial offset) and 2) when tightened up, won't pull down squarely. Mine was fitted the wrong way round (I won't say who was guilty but its wasn't me) and it lead to 'wobbly brake syndrome' just as you have experienced.

It would seem that you might have a disc that's out of shape (varying thickness) and that can be measured with a vernier gauge or micrometer if you have access to one. Measure the thickness at several points round the disc and if teh variation is greater than 0.1mm, then I'd say it was out of shape. Alternatively, it's not fitted/running true to the axis of rotation so check for muck/rubbish/swarfe on the mounting faces (directly under bolting locations) when you remove it, just in case it's not sitting true to start with!

Best of luck,

Drew

Drew

LeftieBiker
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Re: After 3 years, I've discovered, that my rear disc is not ...

Whenever I get to feeling sorry for myself because of my wrecked-on-delivery ZEV, I read about Vectrixes again, and feel a little better. ;-) I actually came within minutes of buying one on Ebay. How did this company manage to screw up so many different things, while using so many name-brand motorcycle components???

AndY1
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Re: After 3 years, I've discovered, that my rear disc is not ...

:-)

I have good news thought. I have contacted Austrian dealer and he replied:

You can purchase from the disc like me!
The costs are € 88,13 + € 20.00 postage and handling, without VAT.
Delivery time is about 2 weeks.

Not to bad :-)

berndoz
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Re: After 3 years, I've discovered, that my rear disc is not ...

I just changed both tires to City Grip as my rear tire looked like slick and was barely holding it together.

Whilst dismantling I noticed that the rear brake disc and pads were badly worn. I took the disk to MetalGear in Brisbane and they re-ground the surfaces of the disc and showed me that the disc used to have had a wobble in it. Not much but noticeable when grinding back. From measuring the disk they also found that it is identical to a Cagiva Grand Canyon 900.
I'll be testing the re-surfaced disk for a while to see how long it will last.

Bernd

Mik
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Re: After 3 years, I've discovered, that my rear disc is not ...

I just changed both tires to City Grip as my rear tire looked like slick and was barely holding it together.

...
Bernd

Why did you choose the City Grip? My tires will soon be due for replacement again....

This information may be used entirely at your own risk.

There is always a way if there is no other way!

berndoz
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Re: After 3 years, I've discovered, that my rear disc is not ...

No particular reason other than wanting to try a different tire. The Pirelli was ok, had a reasonable grip when warm except the last couple of thousand km when it was smooth as a baby's bum

Bernd

turok
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Re: After 3 years, I've discovered, that my rear disc is not ...

I use a city grip for the back rim for a year now.

It sticks very well to the tarmac, I love it in comparison to the Pirelli. Only minus point is a humming sound coming from it.

"doing nothin = doing nothing wrong" is invalid when the subject is environment

Mik
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Re: After 3 years, I've discovered, that my rear disc is not ...

I use a city grip for the back rim for a year now.

It sticks very well to the tarmac, I love it in comparison to the Pirelli. Only minus point is a humming sound coming from it.

How fast does it wear down?

This information may be used entirely at your own risk.

There is always a way if there is no other way!

turok
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Re: After 3 years, I've discovered, that my rear disc is not ...

about the same rate, maybe a little slower.

I didn't pay attention to my milage at the time though, so I'm not entirely sure.

I wouldn't trade back though :-)

"doing nothin = doing nothing wrong" is invalid when the subject is environment

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