Movit Brakes and Warning light

[simon_golf_tt]

Let use know what you end up getting Durit

[Durit]

hello

i have compared the two rotors: movit 380x32 for RS4 B5 and Brembo 380x34 for RS6

1- the offset

the distance between the side facing motor of the rotor and the inside of the hat/bell is 40,5 mm on both rotors

this mean that the offset of the movit one is: 40,5-32/2=24,5 and the offset of the brembo is 40,5-34/2=23,5

the inside face of the bell need to be machined, or the bracket on his knuckle face (1 mm)

2- the height of the friction ring

62mm for brembo and 65mm for movit

-> Mov'it 4M6 kit (996 turbo calipers): the pads match perfectly the 380x32 rotors, perhaps (?) they will need to be machined on the bottom (2mm) to match the 380x34 (or the clearance between the pad ant the bell will be bad/touching)
-> Mov'it 6M1 kit (996 GT2): the GT2 pads don't match the 380x32, they need to be machined 2 mm; the GT2 pads will need to be machined 4/5mm with the Brembo rotors

3- cost

if you want brembo rotors you will have to buy complete rotors (ring + bell), then the price is 1800-2000 euros
the brembo rotor ring doesn't math the movit bell

if you buy the rotor ring alone from Mov'it, it will be cheaper (500 euros?)

I think that the 380x32x65 are available only from Porsche (993 GT2) or from Mov'it... Brembo are selling only 380x34x62... AP perhaps?

Laurent

[Durit]

PS: the brembo rotors 380x34 are for RS4 V8 and not for RS6
PS2: the price in france is over 2000 euros for these

[simon_golf_tt]

Thanks for the info Laurent. Sounds a bit pricey though. I'm looking at other options and will report if I'm successful.

[Tomson]

Guys, please keep me in the loop with this I have Movits front and rear on my RS4. The front discs and pads need replacing, the rear discs also need replacing. I have been putting it off for ages (just use the serach function fopr Movits!)

My fronts are also the 4 pot 'Big Reds' with the 380mm discs.

TBH I am considering just changing the rear discs and then completely ditching the MOVIT set up. The brakes have always caused brake shake and this has got steadily worse over time. It is really bad at the moment and is one of the main reasons I don't drive the car as much as I should.

I simply feel that the Movits are not designed/engineered well enough.

After reading through all of the Movit posts the general consensus is that there could be several answers.

FlashyG now uses AP racing discs, someone else found that the 'bells?' were badly machined and had some more made, others think that the pads are shagged and degrading onto the disc surface.

As I said I just want a solution that works without all of the <beep> about and the ridiculous cost of the discs and pads.

By the sounds of it I would need to spend approx £2k to replace discs front and rear, and the front pads. I would prefer to go for the B7 solutions at £1200ish, get new rear discs (anyone have a price for these?) and then sell the movits on ebay.

Just my 2 penneth worth

[Durit]

hello

i have absolutly no problems with my rear movit kit, using the movit sport brakes.
i tried to use jurid (porsche) on rear with humming noise and brake pad deposit... get back movit sport and no more problems

when i had the front movit 4 pots calipers (996 turbo), i used original porche pads with no problems, street and track

now i have the 996 gt2 movit kit on front (6 pot) and i have problems with the pads:
- the movit "confort" pads are not good for track (burning), it seems that they dont have "sport" pads for these calipers, and there is only few aftermarket pads for these calipers: pagid and carbone loraine... very high cost
i will try the porsche 997 turbo pads, seems to match the calipers
- the 2nd problem is that the pads need to be machined to match the 380x32... it was not the same with the 4 pots calipers
- when driving very fast (over 200) on road, with ligh braking, i have vibrations... i disappears with hard braking. No vibration on track... pad deposit on front? i must find the problem

Some people say that the movit rotors crack... thats right when you use high friction pads on high speed... there is no cooling on our cars, the car is heavy, and with these pads the t° goes high very quickly and then (when you stop braking or drive very speed immediately after) the rotors get cooled to mutch quichly too... and the rotors crack

... i've seen exactly the same with the B7 kit, some guys had the rotors crack in less than 5000 kms because of braking at high speed.
a frind of mine bought the mtm RS6 clubsport (580hp-1400 kg) his front rotors 380 x34 (without holes!) are completely cracked every where!!!

I think the more the brakes are big and the bite power is high, the more your rotors will crack quickly

... if you are a hard braker...

[Durit]

PS: if you don't have a rear kit it will be worse because all the braking power will be on front....

[simon_golf_tt]

Tomson - I know exactly how you feel and agree entirely!

I too would rather buy the B7 RS4 complete setup than two Movit discs.

What I'm about to try within the next few weeks is fitting the B7 RS4 discs with the Movit calipers. I managed to acquire a scrap B7 RS4 disc from Doug at MRC for a trial fit (thanks Doug). My findings are that with a little machining to the Movit Caliper Adapter I can move the caliper offset to suit the B7 discs.

These discs are slightly smaller at 365mm, but they are also thicker at 35mm (compared to 32mm). The cost of the B7 discs is ~£200 each compared to £500 each for the Movits.

Clearance to OE wheel looks like it should be fine. The pistons in the caliper retract enough to except 35mm discs with new pads. The clearance between the caliper pad retainers is 37mm - so 1mm either side of disc when disc is new.

The caliper adapter requires machining to move the caliper 3mm towards the centre of the axle and 2.5mm outboard from the car (if my measurements are correct). These are small amounts from a chunky adapter, so I'm confident that the structural rigidity will not be compromised. A machine shop should be able to do this for a small charge. Luckily I have a friend with access to a milling machine.

The pad will require a little fileing to the outer edge to remove any overhang from the disc lip (~4mm).

I'll try this within the next few weeks and report how it goes. If badly then I will just have to get the RS4 calipers and pads to go with the discs.

Here is a pic of the trial fit and the adapter.

[Tomson]

Good work fella, I looked at my front discs again and they are actually in great shape.

I have put the car up for sale now, but if I was keeping it I would try cleaning the disc and changing the pads to the standard Porsche set-up before going down the B7 route. On a trip out today, on really hard braking it was fine, but on gentle braking it was shaking as usual. This led me to think that it might be a build up of pad deposits on the disc. I don't use the car very much.

However if the brakes do need changing it would be good to know that a B7 disc can be used with the Movit caliper with a little machining.

Also looking at the rears I think they could just do with a skim.

[Durit]

the B7 rotors are 34 mm thick, no?

i have the same problem, shaking but only after driving longer at high speed (over 200 km/h)

i think it comes from pad deposit.... but is it a pad quality problem or rotor quality problem?

i did not have this problem with the porsche pads (with the 4 pots calipers)

[simon_golf_tt]

Durit - they may be 34mm thick. I tried to find this out on the web but didn't manage to find a definate answer. The 35mm came from measuring the shot disc in the area of no wear. To be honest 34mm is good for me as it gives a little more clearance.

Does anyone know if the B7 discs are 34mm or 35mm?

I'll be buying some asap - so will know soon anyways.

[Durit]

the brembo 380 kit for B7 is 34

[simon_golf_tt]

I'm talking about the standard B7 RS4 discs which are 365mm (not 380). I think they may well be 34mm thick though, rather than the 35mm I originally suggested.

[tdiquattro]

I have 322 Movit fronts, and the move to softer porche OEM (Textar) pads from Movit (Textar) sport pads, combined with modifying the centre of the rotors to give a tight (central) fit with no lateral movement has given perfect results. No other changes were made.
I think it was the centring that was the problem all along.

I am just changing to 997 GT3 calipers with custom made discs (360x34) and rotor hats, a bit of an experiment, hope it works out, I think the 360/365x34 is the perfect size. and 6 pot not 8 pot 4pad is the best caliper.

Saying all that if i did it again I would try to go Nascar - you can get the discs and calipers from the states cheap as chips, and they only go up to 320mm ! so there must be something in it - the discs get thicker not bigger as the spec goes up, not sure about room under the wheels but you RS boys should be fine. The best way to go if you can engineer it. AP nascar calipers, 322mmx38 and pads, bulletproof and cheap consumables.

Cheers

Nigel.

[tdiquattro]

Oh and B7 RS4 discs are 34mm