imloggedin

i cant find anything that specifies the differences in caliper # of pistons and rotor size on here. maybe i just missed it. the pinned thread with all the specifics on the changes in years wasnt really specific about these things. i was wondering if the 88 GTU has the same calipers as the TII. i havent had a chance to look yet.

thanks

CyberPitz

If I'm not mistaken, the GTU and TII have different sizes..but then again, I am not the best choice for answers.

RX3SP

iTrader: (62)

The 88 GTU model had the same brake calipers and rotors as the TII's. The S5 GTU models had different brakes than the TII's.

RotaryResurrection

iTrader: (8)

There were 2 different types of brakes; small and large. The 86-87 base, 88 SE, 89-90 GTU, and most of the 91 nonturbos (there were no NA trim levels that year) have the small brakes, which consist of a single piston caliper up front and a non-vented rotor in the rear. The 86-88 small brake cars were 4 lug, while the 89-91 small brake cars were 5 lug, but the brake calipers themselves were the same, and the rotors were the same diameter, just drilled differently for lug pattern.

Everything other than the above models got the 4 piston front/vented rear big brake setup. This includes all turbo, convertible, gxl, and the various "sporty" models throughout the years.

imloggedin

thanks kevin

Black91n/a

That's not entirely true, the 5 lug 4 piston brakes use the same front rotors as the 5 lug single piston breaks and the 5 lug 1 piston cars also have larger rear rotors than the 4 lug cars.

RotaryResurrection

iTrader: (8)

By what...like 1/4"? What does it matter...for all intents and purposes, they are the same thing. Here I am trying to simplify things for people and you're complicating matters for them.

farberio

iTrader: (7)

If switching an 86 base from the solid disk to the vented disk, will the same rear calipers fit?

RotaryResurrection

iTrader: (8)

No, because obviously the disc is wider, the pads are teh same thickness, so the caliper needs to be wider as well.

Black91n/a

It does matter when you're looking to buy parts and get all confused when there's no small 5 lug rotors.

RotaryResurrection

iTrader: (8)

I dont know about you, but I would certainly consider a thin, non-vented rotor to be "smaller" than a thick, vented rotor, as well as the different calipers that accompany them. But that's just me.

Black91n/a

The fronts then.

Anyway, the point is that they're different, plain and simple, there's not really much point in arguing over how much difference it makes.

RotaryResurrection

iTrader: (8)

Well, let's see. There's 4 main parts of the brake system we're talking about. Front rotor, rear rotor, front caliper, rear caliper. OF those 4 parts, 3 of them are small on one version, and larger on the other. To me, that sounds like a "small version" and a "large version" even though one part does in fact cross over.

I stand corrected, I guess.