K-Spot, D2, Attkd Etc

[Legionnaire]

Roy, Range rovers never had 8 piston calipers from factory... 6 piston max.

Front brakes off Audi RS4 B7, RS5, RS6 C5, R8 and Gallardo are identical. They are equipped with Brembo G-family 8 piston calipers, take 4 pads per caliper and have (28+32)x4 mm pistons, which gives total piston area of 56.8 sq.cm., slightly larger than 55.54sq.cm commonly used B-family 4 piston brembos with (40+44)x2 pistons. Intended to run on 360 to 380mm rotor 32 to 34mm thick and swept pad height of 61.5 mm (tall pad). So other than some difficulties with availability of wide annulus rotors it's gonna be fine.

[Luke_ENR34]

Thanks for that mate ^^

Had a feeling they were all the same. Top Secret use the 8pots with a f360 rear on most of there cars over in Japan.

[Roy]

The G Family of calipers do come in a range of applications and I can promise you that Brembo sell a Range Rover kit. They are not factory but if you check the Brembo GT catalogue you will see that Brembo list a Range Rover kit and other giants like F150s and whatever those Cadillac SUVs that all the bling brigade drive (Escalades?) Who knows what year models it was for. I almost bought a Range Rover kit a while back but the piston info they provided me turned me off. But they were dirt cheap

I am in country NSW with work so dont have access to my drive of catalogues and caliper part numbers. I could be wrong but if you look here ... http://www.racetechnologies.com/images/Retail_GT_Application_List_2011_(06.29.11).pdf

There are a number of different G family kits. Apologies if I am wrong but the following G kits are different by part number and in turn piston sizes.

Range Rover_____1G2.9006A

LS430__________1G2.9019A

AMG CL55______1G2.9023A

ML550__________1G2.9029A

Cayenne________1G2.9016A

You may be right about the RS4/RS5/Gallardo having the same kit number. I have a quick look on the net to see catalogues but cant find the US site that has the comprehensive logs but I think you will find the 06A, 19A, 23A, 29A, 16A etc are all the exact same kit other than the piston sizes and leading/trailing applications. If you look at what part number is cast into your calipers you will be able to see what car Brembo offer that kit for and trace it through to piston sizes

[Roy]

What are the piston diameters like on your Stoptechs Troy and how are they handling the track work you've put them through?

My Stoptech as the same size as Brembo F40s which are the same as std R33/34 GTR Brembos at 44/38mm. They are working only ok as I have run too racey a pad comound (endurance spec PFC06) and need to get the rotors ground to get rid of the old pad material as the new pads wont bed and i am getting uneven pad deposits

[MrStabby]

need to get the rotors ground to get rid of the old pad material

A rub with wet and dry wont do?

[Roy]

I thought that a number of runs with the new pads would clean up the rotor?!?!? Not sure, have not had this problem before. It could be a simple case that I have gone from too race a pad which would glaze over because it never got up to temp...to too much a road pad that doesnt like the heat of the track. The lil RB74 is a pretty basic pad and when i pulled them out to de-glaze them by rubbing on concrete and see that the pad material is already cracking

So, will just stop being a tight ass and get some pagids

[MrStabby]

I thought that a number of runs with the new pads would clean up the rotor?!?!? Not sure, have not had this problem before. It could be a simple case that I have gone from too race a pad which would glaze over because it never got up to temp...

I thought the theory was that track pads running under temperature were in "abrasive" mode, so they wouldn't lay down any material (they just chew out the rotor)? And as a side effect clean off any material left behind by other pads.

to too much a road pad that doesnt like the heat of the track. The lil RB74 is a pretty basic pad and when i pulled them out to de-glaze them by rubbing on concrete and see that the pad material is already cracking

FWIW I'm going to try A1RMs ($180) in the G4s at Wakie on saturday. Was happy with the EBC golds, but they're more like $300 (which is still cheap).

[Legionnaire]

Roy, I apologize, I thought you were talking OEM calipers there...

That varying part in brembo p/n is "kit progressive number" as per brembo p/n reading key. Since it's a kit, this "progressive number" probably varies because of different caliper brackets required for different cars. But I agree, it could also mean different piston diameters.

I was writing about OEM audi/lambo caliper, which is a classic G-family caliper and has 28 and 32mm pistons. AMG 8 piston caliper (w211 E55, w220 S600, etc) is some kind of modified G-family caliper and has different piston diameters, four of them are 30mm, the other four I'm having hard time finding info about. But all the info I've seen so far suggests that brembo 8 piston calipers have a combination of 28, 30 or 32mm pistons.

The easiest and most reliable method of telling brembo piston diameter I've discovered so far (for street calipers at least) is by reading dust boot p/n. But have never seen 46 or 48 mm brembo pistons, so have no idea what are dust boots' p/n's for those.

Also sorry fot thread jacking, my p/n interface here refuses to work for whatever reason.

What are people's opinions about PFC 01 compound for mixed street/track duty? Too racey a pad, just like PFC 06 or a bit more street friendly? What about their Z-rated compound for street?

MrStabby, what do you mean by EBC gold - is it EBC yellow or EBC orange? Keen to hear your feedback about them on track and street.

[Roy]

Its good info , so post away!

I really want to like the PFC06. They are mega bitey but do give a great pedal feel. Its just I dont have ABS.

I used a set of PFC01s in an old F40 setup and I liked them...PFC06 are meant to be similar to PFC01 but an endurance pad. So they may be more suitable if I was running a bigger GTR booster and smaller 324mm rotor. But on my setup they mean way too many brake lock ups. Hence my move to a low friction RB74. I can really jump on the pedal and get good modulation.

I really want to find a cheap pad that works well with 343mm rotor and 4 pot caliper. Dont want to be paying $600 for pad

[Legionnaire]

I faced that problem before - changed pads from TRW/Lucas to some other pad, don't remember which one exactly. Turned out the new pad material that was supposed to form transfer layer on rotors was just incompatimbe with the material that had been previously laid by Lucas pads - new pads wouldn't make new layer no matter how long I tried to bed them in. Later I read about similar issue in internet and found out that due to incompatibility of pad material there's no chance of making them work without rotor grinding or sanding. I CBF sanding rotors myself back then, so just had them regroung by a workshop.

If i'm not mistaken it is Stoptech who recommends Hawk 9012 compound for on-car rotor grinding. Maybe that's the go, but paying full race pad price just for occasional ridding the rotors of old pad material doesn't sound like well spent money to me.

BMW guys suggest swapping both pads AND rotors that were bedded in together before a track day. This solution allows some savings of not only race pads, bit also expensive 2-piece floating rotors. Plain cast-iron rotors and sporty pads for street, race pads and floating rotors for track.

With small diameter BMC, no ABS and relatively large rotors looks like you need a pad with moderate coefficient of friction and good low-temp performance.

Maybe something from EBC range would be ok, like yellowstuff. They are not super-dooper pad, but supposed to be inexpensive. But they really tend to wear out fast.

Or maybe PFC Z-rated pads (has .10 at the end of pad p/n) - no issues with material incompatibility and good cold friction u's.

[MrStabby]

MrStabby, what do you mean by EBC gold - is it EBC yellow or EBC orange? Keen to hear your feedback about them on track and street.

Sorry yellows. Track, no problems, will buy them again if the A1RMs aren't as good. As you'd expect they don't have much bite on the street, they're usable but feel crappy. Also they seem quite gentle on rotors at street temps, unlike DS3000s which seem to chew rotors at street temps. Pad life has been fine.

[Luke_ENR34]

All sorted, silly me was ready dust boot covers.

pistons are the 32/28 variety

[Legionnaire]

Dust boots - are they saying 20.4872.40 and 20.4872.42?

MrStabby, thanks for the info.

[Luke_ENR34]

Yeh. On the caliper it says 20.7675.02

[Legionnaire]

for everyone's info.

w204 C63 AMG,

6 pot front brembo N-family caliper, wide annulus pad, trailing, intended to sit over 360x36mm rotor, piston sizes (34+36+38)x2 mm,

4 pot rear brembo, looks somewhat similar to P-family caliper but takes pad of different shape, trailing, rides on 330x26mm rotor, piston sizes (28+30)x2 mm

[Legionnaire]

Forgot to add - they are monobloc calipers. Piston area of the front caliper is huge - 61.2 sq. cm. and might work okay on skylines only with 1 1/16" BMC.

Rear pad has dimensions similar to brembo A/C/F family pad.

Does anybody know if there's such thing as 1 1/8 BMC" on a nissan?