atb

Latest addition to the S4 just arrived today from Motorsport in UT. Twin Turbo rear brakes, very nice. I'm trying a new (to me) kind of brake pad under advice of Dave Lomas. They are Textars. I can say one thing that I'm impressed with right away, they are the only pads I've seen for the S4 that come with a metal backing plate. I've been having serious squeal issues with my stock rear calipers for awhile (Nothing that a set of new TT calipers shouldn't cure). I've tried different pads, rotors, thorough cleaning, with sound dampeners, without sound dampeners, sound dampeners with goop. The latest thing I tried was using just the goop on the back of the pads, letting it dry for about 30 minutes before install. They're definitely quiet now.

Will take pics after the install. These will make a nice addition to the Big Reds onboard up front.

Chris

very pretty, they are going to look nice, did you get a new brake bias valve too ?

Lets hope you get a chance to use them in anger in a month or so !

Chris

Ketchmi

The 55 bar brake bias valve should arrive today.......

Hey Chris, I will be up there in 2 weeks for a wedding, need anything?

Adam C

How bout a shot of the front brakes as well?

Also, how is the stroker going?

Adam

BC

Well there you go. What rotors are those?

Shane

Sweet!! Now all you need to do is install that stroker so you have a need for all that braking power!!

shaaark89

hey adam (and dave),
are those stock calipers/rotors or are they modified to fit the s4?

drnick

what does the bias valve acheive? very pretty brakes!

Adam C

drnick IIRC it allows the rear brakes to apply a larger percentage of the total braking force over the stock setup.

Dennis K

Just a quick heads-up Adam -

I'm running the 993TT brakes front and rear with the 33 bar bias valve and I think that's about as much rear braking force as I need or want. The bigger pistons and larger discs of the big reds are going to increase the rear braking torque by themselves. Adding to this a higher psi valve may make the car twitchier under hard braking.

I just wanted you to be cognizant of this before you went into max decel mode before Turn 1 at Spokane at 155mph!

Jim bailey - 928 International

Dennis "twitchier" as in you might just get a very quick look at where you have BEEN...?

bd0nalds0n

With cars that have ABS, what's the purpose of having a proportioning valve at all? I put a 33 bar on mine, but couldn't really tell much difference, but haven't really subjected the car to extremes. With ABS will the car still get twitchy during a high speed, hard braking turn in situation? I have seen "cautions" on DRs website about the 55 bar bias valve.

BC

I put the 33 bar on the 89 and I felt that IT combined with a lightened rear end made braking on the highway around a slight bend a bit more... interesting. This was from 140 down to 90 on 5 south through Camp Pendleton. Please no PC crap - highway was empty and the 540 dinan wanted to play. I haven't driven the car in 2 years - all I have are my memories.

drnick

whats the stock proportioning and does anyone have any more reports on whether this is a good modification?

Shane

Dudes you are supposed to get all your braking and shifting done before the corner, not in the middle of it!