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MrGPz
Biondino
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PostSubject: Brake Rotors   Tue Nov 14, 2017 6:36 pm

Hi,

I have been feeling the front brakes pulsing when braking to a stop, not noticeable at speed or hard braking.

So the bike shop tells me the disc is warped. Now i don't know if it is one or both, or if it is the carrier that is bent.

So, how to tell if it is the carrier or the Rotor?
If it is a rotor then should i purchase just that one or replace as a set?
Can you buy just a rotor or just a carrier and are they able to be reinstalled on the non-bent bit?
I have seen various ones advertised, there is even NZ made ones and Chinese ones, does anyone have any experience with non-MG rotors?

BTW, i have checked all the bobbins and the rotors are all loose on the carriers.
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Oz1200Guzzi
Don Abbondio
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PostSubject: Re: Brake Rotors   Tue Nov 14, 2017 7:39 pm

Some, years back, because they were "warped" had pad buildup on them. Turns out the bobbins were the culprits. Might be worth a clean with disc cleaner - then go our and do a few hard stoppies to ensure the buildup (if any) is gone. Bit of fun anyway...
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ghezzi
Fra Cristoforo
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PostSubject: Re: Brake Rotors   Tue Nov 14, 2017 7:57 pm

Best replacements.
Grimeca rotors off an early RSV4 (don't know if current model is the same)
Can only purchase from Aprilia dealer .............. in Europe they were only Euro130 each.

Why? Cheap compared to most alternatives. AND THE LIGHTEST DISCS AVAILABLE.
Local product (Metal Gear) are AUD$200 each.
I imported BrakeTech Axis-Iron rotors from America, cost me nearly AUD$1000 a pair and they are still heavier than the Grimeca's.


Last edited by ghezzi on Tue Nov 14, 2017 8:58 pm; edited 1 time in total
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beetle
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PostSubject: Re: Brake Rotors   Tue Nov 14, 2017 8:33 pm

For once I agree with Wayne. Get the Grimeca's. You'll see rainbows, frolicking ponies, and unicorns. I did.

cheers


I know where there's a new pair for sale. Cheap.

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MrGPz
Biondino
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PostSubject: Re: Brake Rotors   Tue Nov 14, 2017 10:48 pm

beetle wrote:
For once I agree with Wayne. Get the Grimeca's. You'll see rainbows, frolicking ponies, and unicorns. I did.

cheers


I know where there's a new pair for sale. Cheap.

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Are they wave discs?
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beetle
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PostSubject: Re: Brake Rotors   Tue Nov 14, 2017 10:57 pm

No.
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MrGPz
Biondino
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PostSubject: Re: Brake Rotors   Tue Nov 14, 2017 11:18 pm

Good, I'll pm you
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avgpetro
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PostSubject: Re: Brake Rotors   Wed Nov 15, 2017 7:09 am

You feel the pulsing on the lever or on the handlebar? The steering bearings may need tightening/replacement
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Brent S
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PostSubject: Re: Brake Rotors   Wed Nov 15, 2017 4:38 pm

Interesting. I have the same issue with my GRiSO. A slight pulsing through the lever when coming to a stop. Can only feel it on light front brake applications at low speeds. Not bad enough to be annoying, but it’s there nonetheless.
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paulbrice
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PostSubject: Re: Brake Rotors   Thu Nov 16, 2017 12:32 am

Check the bobbins first [You must be registered and logged in to see this link.]
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bahamazoo
Don Abbondio
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PostSubject: Re: Brake Rotors   Thu Nov 16, 2017 2:37 am

#3 for the bobbins and an easy fix!
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davem
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PostSubject: Re: Brake Rotors   Thu Nov 16, 2017 3:30 am

After checking the bobbins measure the thickness of the brake disc over a number of points. Anything more than a 0.02mm variation will cause pulsing.
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pauldaytona
Fra Cristoforo
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PostSubject: Re: Brake Rotors   Wed Nov 22, 2017 1:36 pm

What I did to find out, take a piece of metal as thick as the disk, take one caliper off, and bind it to the forkleg. Put the metal in where normal the disk is. Fix that secure.

Drive and brake. Best on quest road. If no vibration it must be the other side. You can swap the test to be shure.

This is a dangerous test be careful!

Also clean pads, see if all pistons operate freely. Clean disks.

Replacement disks are the stelvio >2011 grimeca stock. The RSV4 are even better, look the same, but have a alu carrier, where the Stevio ones have steel carrier. I think now since Grimeca went out of business, Piaggio lets make in china, look the same, but no grimeca print on them.
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MrGPz
Biondino
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PostSubject: Re: Brake Rotors   Wed Nov 22, 2017 4:35 pm

Righto,
Step 1
Order Gremeca off ebay, beetle put me on to them
Step 2
Spray Brakleen over everything including the bobbins, and made sure the disc has freeplay.
find that the pulsing has gone away, at least for 20-30 kms.
Step 3
check out video above, realise that I need to make sure the bobbins rotate - Tomorrows job
step 4
check disc thickness as suggested - Tomorrows job
Step 5
Replace with Grimeca anyway, when they turn up. Can always do with more unsprung weight, or is that less unsprung weight
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