RobbyTT

the 180, both quattro and fwd, and the 225? If I upgrade to 225 sized calipers and rotors on the rear, should it work ok? I know Jenner and Larry, you guys are looking into this, but did you figure it out yet?

My mods have to be a combination of looks and performance and so I'm thinking about some zimmerman cross driller rotors..

Larrytt

Robby, I just checked my ETKA cd from Oct 2000 and this is what it showed:

Master Cylinder
2000 TT's - 1J1-611-301
2001 TT's - 1J1-614-019

Brake Booster
2000 TT's - 1J1-614-106-E
2001 TT's - 1J1-614-106-E

This is the same for both years.

It does NOT differentiate between models, just years. Usually if something is different between a Fwd and Q it will give both part numbers. It also shows stuff for 180 and 225 such as intake and exhaust and turbo. For the brakes it is not showing a different part.

I would contact the dealer and ask them for the part numbers for the 180 and 225 and go based on that.

RobbyTT

From what I understand...the rear setup differs on all three models trims.. The difference between the 180 and 225 being caliper size and rotor... The rotor on the 180 FWD is the smallest and not vented - solid. The 180Q is bigger and the same size as the 225 but the difference being thickness (vented), the 180 is solid, the 225 is vented. I will call the dealer to find out for sure but should it matter on the master cyclinder side of things?

I might just stick with the 180 rears..

Larrytt

The only rotors that are the same size are the fronts of the 180TTQ and the 225. The rears come in 3 different sizes, with the 225 being vented and both 180's being solid.

It really is not the rotor that determines the master cylinder but the calipers themselves. The fronts are the same and the rears are similar except the 225 has a larger opening to accomodate the thicker vented rotor. The pads are the same except they 225 pads don't work on the 180 calipers, but they ar the exact same pad. I don't know anything about the Fwd brakes as I have never worked on one of those before nor have I seen one apart.

The cars are most likely the same parts for the master cylinder, but the parts #'s would confirm this. You might find the 2000 and 2001 180TT's even different from each other. It might pay to talk to an Audi mechanic and see what he/she learned in Audi School about any changes. I would guess they are the same parts just from looking at them they look identical.

joe@vwvortex

difference in the volume of the rear calipers between the models. In fact, i'd be surprised if the calipers were different. I checked the CD and it doesn't even show the different brake discs between the 180 and the 225. Looking at the diagram though - i'll bet that the pad carriers are the only thing that is different and the calipers were the same. This is similar to how they do the bigger front brakes as well. As an example - the 11.3 inch front brakes on my old GTI used the same calipers as the 12.3's that are on the TT. In fact it uses the same brake pads. Only difference is the overal rotor diameter and the caliper carrier which is larger to allow the caliper to fit the larger rotor.

Please post your findings since i'm interested in the 225 rear brake upgrade when I go to the StopTechs in front.

Larrytt

did you get my e-mail I sent to you the other day?