Nick Gustas

Just barely, but they do clear!

Before I get started with the pictures, I found an unexpected benefit of the S8 upgrade, the caliper carriers do not have to be removed or loosened to remove the rotor from the vehicle once the caliper is removed!

S8 rear brakes under 2.7t 16" wheel:
<img src="http://tychl.txf.com/s8brakes/S8-upgrade-under-16in-2.7t-wheel-3.jpg">

Yes, I know the wheel is on backwards, is dirty, and has been faceplanted pretty bad, I picked the worst one


Front shot of clearance:
<img src="http://tychl.txf.com/s8brakes/S8-upgrade-under-16in-2.7t-wheel-2.jpg">

Shot from the back side:
<img src="http://tychl.txf.com/s8brakes/S8-upgrade-under-16in-2.7t-wheel-1.jpg">


Here's the S4 rotor in the S8 bracket to give an idea of the radius increase:
<img src="http://tychl.txf.com/s8brakes/S4-rotor-in-S8-caliper-bracket.jpg">


S4 rotor in front of S8 rotor:
<img src="http://tychl.txf.com/s8brakes/S4-rotor-next-to-S8-disc.jpg">

S8 rotor under S8 caliper carrier:
<img src="http://tychl.txf.com/s8brakes/S8-rotor-in-S8-carrier.jpg">


Keywords: S4 rear brake upgrade S8 rear brake brakes 16" wheels 2.7t wheels snow setup brake upgrade

gk1

Is it just an optical illusion or is the air gap on the S8 rotors smaller than the S4 rotors?

Mike2kS4

I have all the parts for this mod sitting in my garage, but am waiting for my existing brakes to give up the ghost (soon).

Nick Gustas

Not sure which is better for street use, more metal, or more air gap.

Nick Gustas

I wasn't sure if the carrier was clearing with the lighting I had, so I ripped the nubs off with the die grinder to be safe.


I was going to wait a bit longer, probably had another 10k on the rears despite the massive lip on the rotor But I decided to answer the 16" wheel question.

gk1

I'll bet the "more metal" is to put up with the abuse cause by the weight of the S8 for daily driving.

It is similar with the stock front S4 rotors. They use thick plates with a smallish air gap. This allows for good street/emergency stops, but is not so good for repeated stops i.e. racing. Upgrade curved vein fronts use "standard" plates with a larger air gap for repeated no fade stops....or so I'm told.

Mike2kS4

I checked my rear brakes/HPS pads recently and they're nowhere near needing replacement. Conversely, my Stoptech 332 front rotors have "had it". I'm waiting for the front pads to go and then I'll redo all 4 wheels with a flush and dream that I have something close to P-car braking.

Nick Gustas

Old Partnumber: 8E0615301B
New Partnumber: 8E0-615-301-P

8E0615301P
Brakes - Brake components - Front brakes - Rotor
ROTOR, Passat, To Vin X1214107 1998 - 1999


?!

Maybe the passat front rotor that it was replaced with has a smaller air gap? The part in the pictures above is 8E0615301P.

Bahn S4

I've bled 3 times and gone through just about 3 bottles. Is this normal when putting on new calipers?

Symptoms: Initial bite feels good and how it should be, but then the pedal starts to sink towards the floor.


Yes, I know the bumper is not aligned.
<Img Src="http://pictureposter.audiworld.com/53141/img_2462.jpg">

Nick Gustas

Still have enough pad left to be safe, slots are functionally gone, but the stain in the metal from being slotted is still there. I figure once I can't tell they were ever slotted I'll swap them out I'm pretty impressed I've had them this long and they never warped, I went through three+ sets of warpy stock rotors in the same amount of mileage with much less power.