my mistake, the 90 GTU does have the larger rotors, but the mounts are still different between the 4 piston and single piston, as well as the soft lines, booster, etc

Depends on what is broken. If they have just been dis-assembled and re-assembled incorrectly then you would need to re-assemble them correctly.

But if the parts are missing, then you are better off replacing the gauge.

 

Ok, thanks.

 

i see, well that helps alot, could i buy the hub assembly from autozone or a auto part store? to do the conversion

 

We are all dumber for having read this thread.....

 

noob speaking here, sorry

would this case apply to a 91 coupe as well? I have 4pot calipers and ss lines ready to install. Am I missing anything else? I asked many people and they said that the 4pot calipers bolt right up. Also, they've known people that did the conversion and didn't have to change the brake booster and MC.. don't know anything else after that though.

 

I know of people that have done the swap without changing the booster and MC (it is much more a S4 issue than a S5 one) and claim that it is perfectly fine, but again, many people don't know what the brakes are supposed to feel like when they do the swap.

But before you do anything, you need to first figure out why you want the 4 piston front brakes and vented rear brakes. Stopping distance is only marginally longer with the single piston brakes, and to retrofit them onto a car not equipped with them can be some work, if done right.

They can be just bolted right on, if you also just bolt on 4 piston soft brake lines, 4 piston hubs, 4 piston master cyl and brake proportioner. But they are not just a un-bolt the old and bolt on the new situation. So why do you need to stop 6 inches shorter... or is it because your buddies would think it cool???

With decent wheels and tires, as long as you are not racing, the single piston brakes are fine for 99.99% of the drivers out there. Heck there are even a couple members that track race with those single piston brakes with no issues.

So make sure it is worth doing for the little difference you are gonna get.

 

a postive note is the single pistons are cheaper to replace pads and nicer to work on.

still like my 4pots though.

 

well on the later models the pad is the same size, regardless of if the caliper is a single piston or 4 piston