jtswenson

Hi,

I've been very unhappy with my brake bias in my 2011 ZR1. I road race the car and it seems very front heavy on bias. I pulled the ABS fuse and did some testing the other day and it locks the fronts up long before the rears are doing much of anything. I realize that a front bias is ideal, especially for a street car, but what's ideal for a race car is a bit different.

Has anyone installed a proportioning valve in their c6? I'm thinking about installing one between the master cylinder and the ABS module on the front brake line...that way I can reduce front pressure.

I'd love to hear of someone who's done this before. Yes, I've played around with different pads and compounds, but it still is not where I would like it. Thanks!

KNSBrakes

Do you run the ceramic setup or have you switched to iron brakes?

seamus2154

I have seen a couple of guys at the track with a proportioning valve on the C6Z. I agree the bias is too heavy up front. I have a 2011 Zo7 and just put on AP racing brakes up front and now it's even worse. Subscribed.

96CollectorSport

I have several cars that are running custom rear brake set-ups to help with the brake bias - the off the shelf stuff works for some people but guys who are really pushing there brakes are going to have problems, especially cars that are running aero. GM Performance had ABS modules that were reprogrammed for racing and they would add 15% more brake bias to the rear to help things out - since those modules are no longer available (and they never made a version for the 09+ Bosch ABS cars) You are left to figure out how to do it on your own, I wouldn't want to put a bias **** on the front brakes because you are giving up front braking to balance the rear - why not just add more rear brake?

My method of choice is to install a custom StopTech kit in the rear - they have the most options for rear caliper sizes so you can pick the bias that you're looking for based off of how your car is set up.

micjester

You are too fast...just drive slower, and you won't have any issues!

jtswenson

My car has the carbon ceramics and I've played with pads but it's not enough....not even close. Having adjustability would be nice, too.

Andrie

This is very interesting as I did not feel this in my limited experience with the car. I’ve only driven it once at the track as the car is new to me. And I run same brake pads front to rear. I’ve also only able to run the car hard for 2 laps before loosing confidence of the brakes due to overheating.

I'll pay closer attention to this next time.

also interesting that varying brake pads have not worked well for you.

seamus2154

How long or how many days have you tracked the CC brakes and rotors??
Playing with other than stock pads only cooks the rotors faster. Evaporation. Became quite an expensive consumable. It starts with going through pads faster then rotors have the evaporation condition making them rougher, which eats pads faster. Switch to Iron. Cheaper and better for tracking in long run.
I am considering getting a little more pad for the rear now that I am on iron and seeing if that will balance it out. Doubt it, because many track guys have the valve?

l98tpi

I investigated this when going to a C6z this year. The C6z's abs computer controls brake bias, so, no matter what you do, the abs controller is going to control braking to the rear. I just run stock sizes and run same pad compound front and rear. I have no complaints on the braking of the car. I did test a couple compounds and found what worked for me.

el es tu

Doug Rippie Motorsport sells a custom adjustable master cylinder...


http://dougrippie.com/products/drm-c...ster-cylinder/

topmover

You might try the C7 carbon ceramic rear pad on the rear as it has a lot more surface area than the C6...........fronts are the same but not the rears.

romandian

does that change bias by having a smaller bore for the rear or how will it help?

c5racr1

I called doug rippie on that MC. You can remove bias from the rear but you can’t add it.

rabrooks

I have the same issue. I run the same pads front and rear. I end up eating up front pads in a weekend and rears last 6-7 weekends. I'd love to find a way to adjust it as well.

Can a tech II or similar adjust the pressures in the abs module?

0Adrian @ F.A.S.T.

Can't adjust the ABS module at all, I have tested pad setups and have seen an improvement using a DTC 80 pad in the rear, DTC 70 in the front. Also remove the rear brake ducts as well.

GSpeed

https://www.corvetteforum.com/forums...der-setup.html