cobalt

I am picking up my 93 C2 on Sunday and to be honest it brakes as well as my 94 turbo and GTS with big reds and big blacks. It does require a little more foot pressure applied and the car will dive a little more under hard braking but it will stop equally as well. The turbo may brake in a little less distance than the other 2 but that is more a factor of the extra rubber the car has.

Bill Verburg

The reason for brake upgrades is not faster stops, it is increased thermal reserves for track use or cosmetics.

You should never let you pads get below 50% for any track use, at any time.

If you upgrade the m/c as suggested them you automaticly are upgrading the reservoir, but it is rreally a non issue except for the m/c.

The 993 lines are bigger, so adaptors are needed to connect 964 to 993 lines.

rideshootanddrink

Bill, if I don't want to mess with stock p/v on 1990 C2 and would want to upgrade rear brakes, then 993 rears are the ticket and direct bolt-ons over stock C2 rotor, correct? Thanks in advance.

cobalt

I agree on he first 2. But doesn't larger dia lines reduce system pressure?

Steven C.

First I am doing this for cosmetics. I want to do the 4 piston rears and then paint fr and r red. Does anyone know the connector sizes to go from 964 brake lines to 993 caliper on the rear? I can then just call Earls and order a set. Thanks

Bill Verburg

Yes, that would work fine

Bill Verburg

No, they went to bigger lines to allow more fluid to move more quickly on the RS and turbos at reduced temps , the smaller caliper cars work fine w/ either the smaller 964 and earlier lines or the larger 993 and later lines

But in any case the only thing that hydraulicly affects the feel of the brakes is the master/slave piston area ratios and front /rear piston area ratios.

There are some minor effect because of seal design and condition and various flex effects but they can be ignored for this discussion.

Bill Verburg

You only need to worry about that when changing the m/c.

The lines from the chassis to the calipers all have the same 10x1 fittings

Steven C.

Got it. Thanks

kgorman

I want to 2nd what others are saying about not needing to upgrade C4 brakes. Honestly, I think mine are just fine even for lots of track duty. The stock C4 brake calipers/system are quite good. I have Hawk Blue pads (going to Pagid Yellows), with frozen rotors (http://www.frozenrotors.com), and ATE Super Blue. They just work great, and never seem to fade or have any problems.

Indycam

"I would first start with changing to a DOT 4 or DOT 5 brake fluid"
Do not use Dot 5 , its not the right brake fluid for this car .

ilko

Can you tell me why? I'm using ATE Super Blue, but I was thinking of switching to Motul DOT 5 for its higher boiling point. Thanks!

Indycam

http://en.wikipedia.org/wiki/DOT_5

http://www.xs11.com/tips/maintenance/maint1.shtml

http://www.stoptech.com/tech_info/wp...fluid_1a.shtml
"We won’t even discuss DOT 5 fluids as they are completely unacceptable to the high-performance enthusiast, but we’ll include them in the following table for completeness."

If you are boiling your ate super blue , slow down , cause you are going way way to fast .

Steven C.

I use AP 600 in my race car and it is great! I have fried and bent backing plates on pads and the AP never boiled. Bleed them and no air in the system

ilko

Ma bad

Thanks for the links though. Very good info there