930 brake question

[todd Jenne]

I have a 1988 911 turbo. I was having trouble with the brakes feeling like there was no power assist and pulling to the left. I took the car to a local Porsche dealer they determined the booster and regulator needed to be replaced. After charging me 1000.00+ and the brake still do not feel right I started to question why they replaced the parts they did. I checked the parts and part numbers the dealer installed and found they installed brake booster number 930.355.027.02. According to my parts book this car should have the 930.355.025.03 booster. Here is the passage from my book " Brake booster Turbo and Turbo look) The internal ratio of the present 8 inch brake booster in 911 turbo and 911 turbo look cars increased from 2.25 to 3.0 for further reduction of force applied on the brake pedal.
Differences: for 911 turbo and 911 turbo look part number 930.355.025.03 (label with i=3.0 print)
Brake booster for 911 Carrera part number 930.355.025.02"
Looks like the dealer installed the Carrera booster. also could someone tell me where the brake pressure regulator is located I also want to check to see if they installed the correct one.
Thanks

[Bill Verburg]

Originally Posted by todd Jenne

I have a 1988 911 turbo. I was having trouble with the brakes feeling like there was no power assist and pulling to the left. I took the car to a local Porsche dealer they determined the booster and regulator needed to be replaced. After charging me 1000.00+ and the brake still do not feel right I started to question why they replaced the parts they did. I checked the parts and part numbers the dealer installed and found they installed brake booster number 930.355.027.02. According to my parts book this car should have the 930.355.025.03 booster. Here is the passage from my book " Brake booster Turbo and Turbo look) The internal ratio of the present 8 inch brake booster in 911 turbo and 911 turbo look cars increased from 2.25 to 3.0 for further reduction of force applied on the brake pedal.
Differences: for 911 turbo and 911 turbo look part number 930.355.025.03 (label with i=3.0 print)
Brake booster for 911 Carrera part number 930.355.025.02"
Looks like the dealer installed the Carrera booster. also could someone tell me where the brake pressure regulator is located I also want to check to see if they installed the correct one.
Thanks

930.355.027.02 is correct for an '88 930
not sure what 930.355.025.03 is, the closest part I have is 930.355.025.05 which is a 959 booster @~$4kUS

The 930 doesn' use a regulator the M491 and regular Carrera do.
If there is one it is right where the rear line leaves the m/c