Testing ABS in 911 Carrera 4 with ABS 2LED Tester Important information on ABS of 911 Carrera

Bosch 9288 Tester

If any work is carried out on the hydraulic unit, speed sensors or cable harness, or if any units are replaced, e.g. during accident repairs, a function check with the ABS Tester must be performed. This prevents any mixing up of the electrical and hydraulic lines and ensures that the hydraulic unit functions correctly. 2. If a fault is indicated during operation without any prior assembly work , diagnosing and troubleshooting with System Tester 9288 is possible. In this case select system...

Possible causes of deviations

Push Pull Solenoid Not Energized

Air gap at speed sensor is too large too small Damage to wheel bearing wheel bearings are not adjustable . Fault, Fault Code Possible Causes, Elimination, Remarks General procedure as for fault code - 21 - 1. Internal resistance continuity between PIN 47 and PIN 46 at control unit plug. Plug connections on right spring strut and on spring strut mount at right of trunk. 2. Speed sensor signal if the ABS tester is used, turn the wheel selector switch to the front right wheel. General procedure as...

Replacing Brake Fluid Bleeding Brakes and Lock Control

Porsche 964 Carrera

Use of an electric filling and bleeding machine is recommended to guarantee fast and practical replacement of the brake fluid. Pour new brake fluid in the supply tank until the level reaches the upper edge. Connect bleeder on the supply tank. Clamp the overflow hose venting with a hose clamp. Switch on bleeding machine. Connect System Tester 9288 in conjunction with connecting lead 9288 1 in the diagnostics socket in the passenger's foot-well underneath a cover . Turn on ignition and tester....

Important information

If admission pressure is too high before a valve is replaced , again build up a slight pressure and, unlike previous test, cause pressure to fall by switching off ignition. Loss of admission pressure should not exceed 0.5 bar within 5 minutes. After removing manometer, select System Tester menue for drive links bleeding and let off brake fluid from bleed valves of longitudinal and transverse lock servo cylinders until no more air bubbles appear. Disconnect System Tester and correct brake fluid...