Important Information

General

The Porsche 911 Carrera (993) is available as standard with ABS 5 (5th generation) or, on option (M No.) with ABS 5 / ABD.
ABD = Automatic Brake Differential.

System Tester 9288 is used for diagnostic operations and system testing of both systems.

The pulse wheels on the front axle (tensioning discs) and the pulse rings on the rear axle have a total of 48 teeth. The versions on the 911 Carrera 2/4 (964) had 45 teeth. This difference should be observed when ordering spare parts to avoid confusion.

The brake pipes on the hydraulic unit and on the adapter have different threads (M 12 x 1 and M 10 x 1). The risk of accidentally interchanging the brake pipes is thus avoided or reduced considerably. The adapter is located on the left-hand upper spare wheel well.


Differences between ABS 5 and ABS 5 / ABD

The major differences between ABS 5 and ABS 5 / ABD are:

- Proportioning valve on hydraulic unit:
ABS 5 = 1 ea.
ABS 5/ABD = 2 ea.

- Number of brake pipes connected to adapter (in upper left area of spare wheel well):
ABS 5 = 3 brake pipes.
ABS 5/ABD = 4 brake pipes.

- ABD warning lamp and ABD operation lamp (information lamp) of vehicles fitted with ABS 5/ABD. These lamps come on when the ignition is switched on (lamp monitor). Those lamps are not used in the instrument cluster of vehicles fitted with ABS 5.




2 - ABD information lamp
3 - ABD warning lamp