mov it brakes

[Rupert]

I would hope for a better brake pedal feel and most importantly, a better initial bite. I've never noticed any fade with the standard discs and pads though.

[Cornishmoocher]

I have......

The reason I uprated my brakes was the fact that I WAS getting fade and the OEMs are good, but the disks are just not upto scratch. There is feck all wrong with the calipers, they are as big as nay on the market and are used in "other applications".
I was getting fade because i DO drive hard (as Rupert can confirm).

Also I am a little confused by the comment "they have a seperate caliper for the handbrake" unless you are going to yank that on at 150, it wont make a shits worth of difference.

Anyhoo, as I said before, there are choices out there, MTM, Movit, AP, EBC the list goes on, but its your choice at the end of the day, i just question whether any of them are £3k better than the unit 20 setup.......

Also you have to remember you are trying to stop a 2 tonne car........

[Daveperc]

The "Grizz" kit is actually the set up from the new RS6 so the other advantage is that you will still be able to get Audi parts etc from any dealer into the future without a problem.

I guess, but don't know, that Grizz spacer etc would even allow you to fit the Ceramic disc option from the C6 if you really want to.

Are any of the others (MTM, MRC, etc) also ofering the C6 option??

Dave

[ecain63]

From what i have read on this forum the best upgrade you can get is the Phaeton cooling duct upgrade on the standard caliper / disc set up. Ask Grizz!!

[darrenswift]

I went for the Phaeton upgrade yesterday during my visit to Corey at Quattronics. Unfortunately, I've not had chance to really 'analyse' the difference , as I'm bedding new pads in, but I'ce read that it's a fairly cost effective way of keeping the discs cooler.

[andyt]

OK, idiot's musings here... If Grizz upgrades the front brakes to the new RS6 standard, does that include the calipers and pads (so that they cover the surface of the larger disc)? And if so, does that then mean that the old bits from the front could be transferred to the rears, where they'd be bigger than the standard rears?

[Rupert]

Grizz's kit uses the larger discs from the C6, but with the 8-pot caliper and original-fit pagid pads from the C5. There is a bracket which moves the caliper out, so that the pads are running near the outer edge of the larger discs. Because the discs are larger than the pads, the inner part of the disc is not worn because it is not in contact with the pad.

Better braking is achieved because the distance from the axle is increased.

[Virdee Autos]

I can't understand why this works, as the pad contact area still remians the same.

I know you say better braking is achieved because of the distance from the axle, but surely this makes no difference. From my understanding, its the calipers, discs, and positioning of the calipers that would make the greatest of differences.

[Rupert]

When I say distance from the axle, I mean distance from the hub or centre of the disc.

The caliper is moved out, so the braking torque is increased.
It is force x distance. As the caliper and pads are the same, the force applied by the pads (to the disc) will be roughly the same (ignoring any differences due to the properties of the disc material), so the braking torque is then proportional to the distance from the axle.

http://en.wikipedia.org/wiki/Torque

So theoretically, the bigger brake kit should also improve pedal feel, because the braking action for any given pedal position wil be greater.

[Daveperc]

I think you answered your own question!

Pad contact area remains same, and pressure remains same, so friction force is the same. However, as it is located further out on the disk (because of the bracket and the larger disc radius), the lever arm is greater so the torque slowing the wheel is greater for the same pedal effort.

Probably more importantly, the heat generated will be the same (slowing the same total mass of car, converting kinetic energy to heat), but it's going into a bigger disc so it will run cooler.

Hope that makes sense

Dave

[Golfather]

Pad contact area is increased per wheel revolution.
When the caliper is moved away, and circumference of the disc is larger, therefore more area contact is made with the pad per wheel rotation.

[matt1979]

im looking to swap the grizz rear uprated conversion back to the normal audi brakes anyone that has a new or nerly new set of rear audi brakes that wants to upgrade to the grizz rear conversion they are welcome to come to my yard in london one weekend and swap them over or call me 07977411644 matt

[JAMES]

IMO you get what you pay for.the grizz conversion sounds like a mecano set to me, bits made to fit and pads that dont cover the disk surface (only going on what ive read).I can understand the larger disks improving performance but with original calipers and pads sounds to me like half a job.i thought it was the pads that caught fire when pushed hard?
i did visit the mov-it factory on the rs drivers challenge a few years back and was very impressed with the set up,they really seamed to know their stuff and machined their products on site.4 of the B5 RS4 drivers bought kits that day on recomendation and i never heard any complaints since(some of whome track their cars regularly).I am not disputing some people have had issues just that i have not heard this.
And as for the seperate handbrake has Cornishmoocher never heard of an audi going for a ride of its own accord.when the handbrake is applied with warmed up (expanded) rear brakes the cooling down causes everything to contract which de-pressurises and releases the handbrake as it is all part of the braking system(a common audi vw problem)do a search!

quote_

"unless you are going to yank that on at 150, it wont make a shits worth of difference"

i beg to differ as i have experienced a runaway car.

it is worth checking if the mov-it kit is bigger for the rs6 than rs4 as mentioned earlier this is a 2 ton car and i seem to remember the rs4 fronts being 380mm.
the standard fronts could not go on the back as an upgrade as you would have no handbrake at all.

[Cornishmoocher]

And as for the seperate handbrake has Cornishmoocher never heard of an audi going for a ride of its own accord.when the handbrake is applied with warmed up (expanded) rear brakes the cooling down causes everything to contract which de-pressurises and releases the handbrake as it is all part of the braking system(a common audi vw problem)do a search!

quote_

"unless you are going to yank that on at 150, it wont make a shits worth of difference"

i beg to differ as i have experienced a runaway car.

Please do not missquote me.
Anyway, unless you are a <beep> idiot and leave it in N, how can this happen in an RS6? its an auto with a PARK function
.....Meccano....

[Rupert]

And as for the seperate handbrake has Cornishmoocher never heard of an audi going for a ride of its own accord.when the handbrake is applied with warmed up (expanded) rear brakes the cooling down causes everything to contract which de-pressurises and releases the handbrake as it is all part of the braking system(a common audi vw problem)do a search!

The shift-lock pin has been in use since 1965 ! The RS6 will not go for a ride on its own! (Do a search )