To say I’m disappointed is an understatement. I finally got the calipers back from the powder coater again with a great color. I got everything mounted last night. I did the rear rotors and pads this afternoon, bled the system twice and then went out to bed in the pads. Damn if I don’t have a super long travel and low pedal. And it’s not very progressive. It goes from barely any brake to medium braking to ABS. Not great at all. I had bled them twice, did the 2# RPV’s in line as well as the red grease on the seals and pistons upon reassembly. I’m pretty frustrated. They look great and the 3 different 17x9’s I run for autocross cleared (barely with one set) without a spacer. All of the wheels are 35 offset: TSW Bathurst, Rota Grid and Advanti Storm S1.
Here is picture of these mediocre brakes on my TT:
I am highly considering 4# RPV’s as a test. I know it cause rear brake drag for emichel6888, so I’m hoping my TT might be different. - AB
I apparently missed this, so without changing the settings does the brake pedal drop and go soft when you start the engine? I am curious because turning off the brake booster settings was one of the first things I did, and I have never tried it with them on since making these other changes. I don't do autocross and never imagined there would be a rule about turning off the booster settings. It is similar to pulling the ABS fuse IMO (which is allowed?), so perhaps you could make that argument? I guess it depends on the intent of these rules, but in this case it seems like a silly rule given that they allow different calipers, pads, and lines. Those are some major changes, but this is where they draw the line, really?
I do recall a gentlemen on here with the ST40 calipers mentioning he was really happy with his brake pedal "after changing those booster settings" so it is very likely all three adjustments (lube, RPV, and booster settings) need to be done to get the ideal pedal response.
The problem with the brakes on this car is they are so heavily over boosted. All three of these adjustments reduce brake boosting, and they each help to a certain degree. It seems some have done 2 out of 3 and that gets you back to stock feel, but it takes all three working together to get the maximum effect. That and of course make sure there is no air in your system.
I did the settings and RPV's and that also got me to what I would describe as stock feel, it wasn't until I went back and lubed the seals that I noticed a big difference. Others have done the lube and settings and also describe a stock like feel, now you have done the lube and RPV but not the settings and again report that it feels stock so...
Perhaps just try the settings so you can see what I am talking about. It makes a big difference and I would think even more so for autocross with so many fast transitions where consistency and control can make a big difference.