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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System (Abs) - 5.3 & Abs/TC 5.3 - 911 CARRERA (996) >> Removing and installing hydraulic unit >> Installation

Removing and installing hydraulic unit: Installation

  1. Install in reverse order.
    • First connect the electrical plug connections on the hydraulic unit, so that the plug connections inside or on the hydraulic unit can not be splashed with brake fluid or water!
    • After bleeding, check the assignment of the brake lines/solenoid valves to the correct brake calipers! Also carry out a system check or a swap test with the PST 2 (Swap test menu item for vehicles with PSM)!
  2. Bleed brakes Refer to BLEEDING BRAKES - VEHICLES WITH ABS AND ABS/TC or BLEEDING BRAKES - VEHICLE WITH PSM .
    • Pay attention to the following in the case of vehicles with ABS/TC (Traction Control) or PSM (recognisable by the rocker switch in the centre console):
    • First bleed brakes as usual!
    • In the case of vehicles with ABS/TC (Traction Control), bleed the ABD circuit after the usual bleeding procedure. This is carried out with the return pump running (activation with the Porsche System Tester) on rear right-hand bleeder valve.
    • In the case of vehicles with PSM, after the usual bleeding procedure, bleed at front right-hand bleeder valve with booster pump running (activation with Porsche System Tester).
  3. When replacing the hydraulic unit in vehicles with ABS/TC or PSM (4-channel system), code the control module (manual transmission or Tiptronic).
  4. Carry out the following tests:
    • Check the system (brake lines and connections) for leaks.
    • Read out and erase the fault memory of the control module with the Porsche System Tester 2 (PST 2). Also carry out the static test.
      Fig 1: Identifying Porsche System Tester 2
      G03105783Courtesy of PORSCHE OF NORTH AMERICA, INC.
    • Check electrical and hydraulic lines (brake lines) for incorrect assignment using the PST 2 (carry out a system check or a swap test)!
    • Then start the engine. The ABS, ABS/TC or PSM-related lights in the instrument cluster must go out when the engine is running.
    • Carry out a function check of the brakes. Then perform a short test drive and perform at least one ABS control operation, taking the road conditions into consideration. Read out the fault memory again. There must not be any stored faults.
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