Installed a 997 GT3 Master Cylinder in my 996 C2
07-11-2019, 07:54 PM
#106
For the record, I've finished the conversion to the new brake booster, pushrod, and firewall seal parts that allows fitting the GT3 master cylinder to the early 996 and Boxsters and have created a new thread on it here: https://rennlist.com/forums/996-foru...l#post15967467
07-28-2020, 08:36 AM
#107
Just found a TRW 99735591030 on line AutoDoc for $95 in Italy... 106 euro with shipping. This should go well with the GT3 front and rear brakes calipers with 350mm discs all around I'm getting later in the month.
Last edited by popster_23; 07-30-2020 at 08:31 AM. Reason: typo
08-17-2020, 04:03 AM
#108
Due to the fact that I have a C4 it looks like I will have to install a rear brake proportional valve to keep the PCM working. Has anyone recently done this mod on a C4?
05-02-2022, 01:39 PM
#109
Burning Brakes
So here is my issue so far:
2002 C2 with PSM. 997 GT3 MC, High temp fluid bleed multiple times through whole system. One week into driving the car the PSM/ABS failure lights came on driving down the highway around 60MPH. Turned the car off and back on with no faults returning. Bleed the system again and put 1500 miles on the car with no issue. At the track yesterday and the car has performed flawless for 6 sessions ( 3 for my wife and I each). 4th session comes up for me and the ABS/PSM failure light comes on again down the back straight into turn 4 causing the right front tire to lock up. Does anyone know why the issue would be this intermittent? I am finding others are having the 4460 fault appear immediately or everytime the car exceeds 30MPH but this is not my experience. I just ordered the Jegs proportioning valve and will install that.
246GTSA, Which brake lines did you use to install that proportioning valve as the link shows OP made his own but it appears you used factory lines.
05-02-2022, 01:58 PM
#110
Burning Brakes
I just did this upgrade without seeing a thread about issues. I have a 2004 C2 with PSM (Which I keep off with the button). Mine is a dedicated track car. I flushed the fluid 2 times before going to the track this weekend after installing 997 GT3 Master Cylinder. First 2 sessions there was no issue. 3rd session on the outlap the PSM and ABS lights came on and pedal got real hard. Was applying brake with medium to high pressure at the end of straight and front wheels completely lock up destroying my tires. Did you do this jegs proportioning valve? Did it fix the issue on the track?
I put this in after and never had to adjust it. Stays in the full open position.
Last edited by hbdunn; 05-02-2022 at 01:59 PM.
05-02-2022, 02:00 PM
#111
Burning Brakes
05-02-2022, 02:03 PM
#112
Nordschleife Master
U should pull the psm plug for the track and fully disable it. The abs will still work but the psm wont be interfearing and our cars dont really need it in the track.
05-02-2022, 02:07 PM
#113
Burning Brakes
05-02-2022, 02:10 PM
#115
Nordschleife Master
The psm still interferes even with it switched off. Yes u will have a light. Ill see if zbomb can comment as he did it with his track car.
05-02-2022, 09:43 PM
#119
Nordschleife Master
All i know is on my car with no psm i used the factory 2000 c2 line from the mc to the abs block with no adaptor. I know Zbomb is doing this on his car with psm. It will remove the residual valve but he has the psm unpluged. I would assume the psm fault light would permanately be on, but im sure z will just disco the dash light.
I do not know how else this will effect a street driven car.
I do not know how else this will effect a street driven car.
05-03-2022, 08:03 AM
#120
Race Car
I just did this upgrade without seeing a thread about issues. I have a 2004 C2 with PSM (Which I keep off with the button). Mine is a dedicated track car. I flushed the fluid 2 times before going to the track this weekend after installing 997 GT3 Master Cylinder. First 2 sessions there was no issue. 3rd session on the outlap the PSM and ABS lights came on and pedal got real hard. Was applying brake with medium to high pressure at the end of straight and front wheels completely lock up destroying my tires. Did you do this jegs proportioning valve? Did it fix the issue on the track?