2005-2008 Porsche Boxster 987 Service & Repair Manual

BRAKES Anti-Lock Brake System (ABS) 45 01 01 PSM/ABS CHECK USING THE PIWIS TESTER - AS OF MY 2005 (ALL MODELS) TOOLS TEST OVERVIEW Test overview The ABS/PSM test includes:  Reading out fault memory.  Static test.  Swap testing hydraulics in the Checks/Tests menu. The swap test is menu-driven. Once you start the test, follow the instructions on the PIWIS Tester.  Checking function and correct allocation of speed sensor in the Actual values menu. Turn all four wheels individually during the test. The speed assigned to the wheel in question must be displayed when you turn the wheel. The non-tested wheel must be held (by a second person) when the test is performed on the driven axle. Designation Type Number Explanation PIWIS Tester special tool P 9718 NOTE:  PSM is installed as standard.  PSM comprises the functions ABS (anti-lock braking system), ABD (automatic brake differential), ASR (anti-slip regulation), EDTC (engine drag torque control), EBD (electronic brake-force distribution) and vehicle dynamic control. 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS) 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

Fig. 1: Hydraulic unit Courtesy of PORSCHE OF NORTH AMERICA, INC. Procedure: If work has been done on the hydraulic unit -D- , the speed sensors and the wire harness or if the hydraulic unit -D- is replaced, an ABS/PSM test (system check) must be performed using the PIWIS Tester! This is the case, for example, after accident repairs! This prevents any confusion of electrical or hydraulic lines and ensures faultless operation of the system! See Fig. 1 . If certain brake lines are replaced, e. g. at the intermediate piece in the front left wheel housing -E- , a swap test must also be performed (in the Checks/Tests menu)! Unintentional bending of the brake lines could lead to incorrect hydraulic allocation despite the markings (FL = front left, FR = front right, RL = rear left, RR = rear right)! See Fig. 1 . If a fault is displayed during operation (when no assembly work was carried out beforehand), diagnosis and fault finding are also carried out using the PIWIS Tester! To do this, select the PSM system and read out the fault memory there! The fault can then be located using the appropriate menus (Drive links, Actual values, Checks/Tests)! PSM check using the PIWIS Tester 1. PIWIS Tester P 9718 must be connected to the vehicle, then start it. Switch on ignition and press >> to continue. 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

Fig. 2: Diagnostic socket Courtesy of PORSCHE OF NORTH AMERICA, INC. The PIWIS Tester 9718 is connected to the vehicle via a diagnostic socket. The diagnosis socket is located inside the vehicle in the vicinity of the driver's A-pillar below the instrument panel. 2. Select the vehicle type and call up the PSM system. 3. Carry out ABS/PSM test (see Test overview). 45 30 19 REMOVING AND INSTALLING HYDRAULIC UNIT - AS OF MY 2005 (ALL MODELS) INFORMATION Information 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

Fig. 3: Luggage compartment cover Courtesy of PORSCHE OF NORTH AMERICA, INC. The brake components (brake booster, brake master cylinder, hydraulic unit) are installed under the luggage compartment cover -2- . See Fig. 3 . Fig. 4: Brake components Courtesy of PORSCHE OF NORTH AMERICA, INC. Remove hydraulic unit -D- together with the support and the four brake lines, which are fitted on the intermediate piece -E- . See Fig. 4 . A - Brake fluid reservoir B - Brake master cylinder 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

C - Brake booster D - Hydraulic unit E - Intermediate piece PRELIMINARY WORK Preliminary work 1. Remove cover over hydraulic unit (front luggage compartment cover) Refer to 70 30 19 Removing and installing front luggage compartment cover - as of MY 2005 (All Models) . Refer to 70 30 19 Removing and installing rear luggage compartment cover - as of MY 2006 (Cayman S, Cayman S RHD) . Fig. 5: Removing luggage compartment cover Courtesy of PORSCHE OF NORTH AMERICA, INC. There are two types of luggage compartment covers -1- (drawings below). See Fig. 5 . 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

Fig. 6: Removing luggage compartment cover Courtesy of PORSCHE OF NORTH AMERICA, INC. REMOVING HYDRAULIC UNIT Removing hydraulic unit Fig. 7: Hydraulic unit Courtesy of PORSCHE OF NORTH AMERICA, INC. 1. Remove hydraulic unit -D- . See Fig. 7 . 1.1. Hold down brake pedal with pedal holder so that the brake fluid (in the reservoir) does not drain completely. 1.2. Loosen the brake lines -1- on the brake master cylinder. See Fig. 7 . 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

1.3. Loosen the brake lines -2- from the hydraulic unit -D- on the intermediate piece -E- . See Fig. 7 . 1.4. Close the brake lines and connections with suitable plugs. 1.5. Release control unit connector on the hydraulic unit and pull it off. Cover the plug connection and connector (to shield them from brake fluid or water). 1.6. Loosen support on hydraulic unit -Arrows- (3-point mount). See Fig. 7 . 1.7. Remove support/hydraulic unit assembly. INSTALLING HYDRAULIC UNIT Installing hydraulic unit Fig. 8: Hydraulic unit Courtesy of PORSCHE OF NORTH AMERICA, INC. 1. Install hydraulic unit -D- . Observe tightening torques Refer to 47 Tightening torques for brake hydraulics - as of MY 2005 (All Models) . See Fig. 8 . 1.1. Insert hydraulic unit with support and tighten fastening nuts -Arrows- (3-point mount). See Fig. 8 . 1.2. Connect control unit connector to hydraulic unit and lock it. 1.3. Fit the brake lines -1- in the correct position on the brake master cylinder. HZ 1 = Brake master cylinder push-rod circuit (close to fastening flange). HZ 2 = Intermediate piston circuit. See Fig. 8 . 1.4. Fit brake lines -2- in correct position. Observe marking on the hydraulic unit -D- and intermediate piece -E- . RL = rear left/RR = rear right/FR = front right/FL = front left. See Fig. 8 . NOTE: First connect the electric plug connections on the hydraulic unit. This will protect the plug connections from brake fluid or water. After bleeding, check the assignment of the brake lines to the correct brake callipers. Carry out a swap test using the PIWIS Tester. 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

2. Bleed the brake system and adjust the brake-fluid level. Refer to 47 01 07 Bleeding the brake system - as of MY 2005 (All Models) . 3. When replacing the hydraulic unit, code the control unit (manual transmission/Tiptronic). 4. Carry out the following tests:  Check the system for leaks.  Read out and erase the fault memory of the ABS/PSM control unit using the PIWIS Tester. Carry out a static test as well.  Check electric and hydraulic lines for incorrect assignment using the PIWIS Tester. This test checks that the brake lines/solenoid valves are assigned to the corresponding brake callipers.  Then start the engine. The ABS/PSM-related lights in the instrument cluster must go out when the engine is running.  Carry out a function check on the brakes. Then take a short test drive and perform at least one ABS control operation, taking the road conditions into consideration. Read out the ABS/PSM fault memory again. There must not be any stored faults. SUBSEQUENT WORK Subsequent work NOTE: First bleed the brake system in the normal way - with the bleeding device at the reservoir and approx. 2.0 bar pressure (primary circuit). Then, use the PIWIS Tester to bleed the brakes as well (secondary circuit). Only necessary if the hydraulic unit was replaced and if brake pedal travel is excessive after bleeding in the normal way (primary circuit). The process is menu-driven. Always observe the specified sequence rear left, front left, front right, rear right. To bleed the secondary circuit, the bleeding device remains connected to the brake fluid reservoir. Bleeding pressure is approx. 2.0 bar. Throughout the entire bleeding process, the brake pedal must be operated cyclically (keep depressed for 2 to 3 seconds, then release slowly). After operating the pedal for the last time, hold the brake pedal down and close the bleeder valve. 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

Fig. 9: Installing luggage compartment cover Courtesy of PORSCHE OF NORTH AMERICA, INC. Install cover over hydraulic unit (luggage compartment cover) -1- , Refer to 70 30 19 Removing and installing front luggage compartment cover - as of MY 2005 (All Models) . Refer to 70 30 19 Removing and installing rear luggage compartment cover - as of MY 2006 (Cayman S, Cayman S RHD) . See Fig. 9 . 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

Fig. 10: Installing luggage compartment cover Courtesy of PORSCHE OF NORTH AMERICA, INC. 45 59 19 REMOVING AND INSTALLING ROTATION-RATE SENSOR FOR PSM - AS OF MY 2005 (ALL MODELS) INFORMATION Information The lateral-acceleration sensor is integrated in the rotation-rate sensor. 2007 Porsche Boxster BRAKES Anti-Lock Brake System (ABS)

2005-2008 Porsche Boxster 987 Service & Repair Manual

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