Anti-Lock Brake System Diagnosis

Important Information About ABS 5.3 And ABS/TC 5.3

General
The 911 Carrera (996) is fitted as standard with an anti-lock brake system (ABS 5.3). "Traction Control (TC)" can be obtained on special request on the basis of ABS 5.3.Traction Control (TC) is a combination of anti-slip control (ASR) and Automatic Brake Differential (ABD).

TC is a further system for increasing driving safety.

ABS 5.3 is optimised with regard to installed volume and weight compared with the ABS 5 (ABS 5 on the 993). Control module (No. 1), hydraulic unit (No. 7), pump motor relay and valve relay (No. 2) of ABS 5.3 and ABS/TC 5.3 are a unit that is positioned next to the master brake cylinder.







Diagnosis and system checks on both systems are carried out with the Porsche System Tester 2.

Differences between ABS 5.3 and ABS/TC 5.3

ABS 5.3 = 3-channel system

ABS/TC 5.3 = 4-channel system

The essential distinguishing features between ABS and ABS/TC are:
- Number of brake lines at intermediate piece

ABS 5.3 = 3 brake lines
ABS/TC 5.3 = 4 brake lines

- TC OFF switch for switching driving stability control on and off is not available on vehicles with Solo ABS (ABS 5.3).
- TC (ASR/ABD) MIL and TC (ASR/ABD) function light (information light) in vehicles with ABS/TC. These lights are lit when the ignition is switched on (lamp check). In vehicles with ABS 5.3 (Solo ABS) these lamps are not fitted in the instrument cluster.