BREMBO BRAKES

[GrahamS4]

Interesting thread. Do the 4 pot Porsche 993 brakes have different size pistons?

It sounds like there is a quick method to check orientation? Is it which ends the bleed nipple is?

99% of all multi piston calipers have different sized pistons so the pad wear is even.
It is not nipple dependent on whether the small piston has the lead, it is whether the caliper (in its original fitment) is a trailing or leading caliper.

Only from pictures, but from what I can see a 993 (unless the tt was different) had a leading caliper where as it is now in a trailing position.

Are there any further visual check that can be done without removing the caliper?

[jimbo1234567]

just check the zr17 or 18 is not on the top of the caliper as a quicky

[GrahamS4]

just check the zr17 or 18 is not on the top of the caliper as a quicky

Woosh was the noise as that went straight over my head!

[jimbo1234567]

go back to page 1 and look at the 5th photo down , you can see 18ZL written at the top which is part of the casting, youll notice that its upside down. this should be at the bottom

[dazzer]

Interesting thread. Do the 4 pot Porsche 993 brakes have different size pistons?

It sounds like there is a quick method to check orientation? Is it which ends the bleed nipple is?

99% of all multi piston calipers have different sized pistons so the pad wear is even.
It is not nipple dependent on whether the small piston has the lead, it is whether the caliper (in its original fitment) is a trailing or leading caliper.

Only from pictures, but from what I can see a 993 (unless the tt was different) had a leading caliper where as it is now in a trailing position.

Are there any further visual check that can be done without removing the caliper?

My Stage 3 ECS kit didn't fit properly when I got it. I had a good 3mm of pad overhanging the disc. The caliper was machined to get the caliper to fall further down the bracket. The pads sit perfectly now but I am now wondering if I have the wrong leading piston, and whether this issue has anything to do with it. Although when I look at the install document on ECS's site it clearly shows the small piston leading. The brakes however perform exceptionally now with no brake judder, in fact they were fanatasic around Castle Coombe so hopefully it was just the caliper bracket was machined to the wrong size. Now I am making it sound like that would be acceptable. ECS.

[bobbler]

Something a little more official from Brembo racing (this is from their own racing caliper catalog, as given from helpful poster on Audiworld - http://www.hrpworld.com/client_images/e ... /658_1.pdf - thats a 9mb PDF link)

Page 4 at the bottom of the mounting guide for calipers.

b. Mount the caliper onto the knuckle such that the arrow marked on the inner half-caliper
corresponds to the forward direction of rotation of the brake disc (the disc must enter the
caliper through the side corresponding to the smaller piston and exit through the other side
corresponding to the larger piston).

I am going to get in touch with ECS again during the week to obviously allow them to comment, as it would be unfair to say that they are sending them all out like this if mine are just not done correctly. That's fair enough I think.

[dazzer]

Something a little more official from Brembo racing (this is from their own racing caliper catalog, as given from helpful poster on Audiworld - http://www.hrpworld.com/client_images/e ... /658_1.pdf - thats a 9mb PDF link)

Page 4 at the bottom of the mounting guide for calipers.

b. Mount the caliper onto the knuckle such that the arrow marked on the inner half-caliper
corresponds to the forward direction of rotation of the brake disc (the disc must enter the
caliper through the side corresponding to the smaller piston and exit through the other side
corresponding to the larger piston).

I am going to get in touch with ECS again during the week to obviously allow them to comment, as it would be unfair to say that they are sending them all out like this if mine are just not done correctly. That's fair enough I think.

Yeah I think that's fair. I am all for fairness and it's the correct thing to do. If they f**ked up though don't expect them to do anything about it.

[CliveH]

next up i just need a little advice onwhat pads to use , a part number and where to get them from. im thinking of getting some oem cayanne pads but darent get a price from a porsche dealer, audi are bad enough.

Jim - you could try Strasse in Leeds (independent Porsche specialist) http://www.strasse.co.uk/

[jimbo1234567]

cheers clive , i ordered a set of mintex yesterday so il see how i go on with them.

[dace]

Slightly off topic, however has anyone tried an alternative disc to the B7 RS4 one? T
My discs have been on 12 months!!? The Brembo (RS6) 8 pots are great, just seem to crack the hell out of the discs.

[CliveH]

Dave - You can use the RS6 or RS6+ discs (many have), but you'll need a modified caliper mounting bracket (available from MRC) to accommodate the different offset.

I'm not sure what the relative merits are (other than RS4 B7 is said to be 'true floating head') or what experiences people have had with the two discs - perhaps a new thread would invite some comparisons?

[rikrose]

I've just done a bit of research. Outside my local Audi dealership a while ago was a Porsche Cayenne. I took a picture of its brakes so that I could compare mine aginst their native habitat. I have that photo on my phone. It is of the driver's side front caliper. This is the same caliper as I have mounted on my car for the same wheel.

This photo shows that it's a caliper-leading setup, rather than on our cars, where it's caliper-trailing.

It also shows that the word "Porsche" is written with the P at the *TOP* of the caliper, and the "E" at the bottom. On my car, the "P" is at the bottom, and the "E" is at the top.

In other words, exactly as you'd expect if you simply rotated the caliper around the axle. Would this put the caliper in the correct orientation?

Another method to check - I can put on full lock, and take a photo of the caliper, from the back. Can someone link to something I can use to figure out which way around I should see things, please?

Also, have ECS responded to whoever it was about the setup?

[jeffw]

Rik

It sounds like yours are the correct way round.

[jeffw]

Discs

The Brembo 8 pot used on the RS6/B7 RS4 is also used in the Brembo GT Big Brake kits. The Kits come with a variety of discs which can be cross-drilled or slotted. I have 380mmx34mm slotted front discs on my car using the Brembo 8 Pot caliper and the difference from a B7 RS4 kit is that the calipers have been spaced out by 7.5mm (and the calipers have MTM on them !).

Brembo do a 405x34mm disc which should fit under a 19" wheel.....

[Doug_S2]

you need custom bells for 380 or 405 as well.