Table of contents: Modulator assembly 🠇 Electronic control unit 🠇 Front wheel speed sensor 🠇 Rear wheel speed sensor 🠇
Modulator assembly
Note: Before you begin, read the brake fluid hazard warning at the beginning of this manual paragraph 2.
Removal
1. Remove the battery and battery tray as described in chapter 5A. Depending on the model and the working space, to facilitate access to the modulator, remove the air filter and the remaining elements of the air intake duct as described in the relevant section chapter 4.
2. Release the locking clamp and disconnect the electrical connector from the electronic control unit (ECU).
3. To minimize brake fluid leakage, first loosen the brake fluid reservoir cap and then tighten it again, placing a piece of plastic underneath to ensure a tight seal.
4. Wipe clean the area around the brake line connections on the side of the modulator and place an absorbent cloth under the connections to collect any leaking fluid. Mark the location of the connections, unscrew the union nuts and carefully remove the pipes. Properly cap the ends of the lines and modulator ports to minimize brake fluid leakage and prevent dirt from entering the system.
5. Unscrew the nuts and remove the modulator from its standard location. If there is enough space, unscrew the nut and disconnect the "ground wire" (if available) from the end of the modulator return pump housing.
Installation
6. If a new modulator is being installed, it is supplied pre-filled with brake fluid and the ports are plugged. Do not remove the plugs until you are ready to connect the brake lines.
7. Place the modulator in its standard location, install the ground wire and tighten its mounting nut. Place the modulator on the support studs, screw on the corresponding nuts and tighten them to the specified torque.
8. Connect the brake lines to the appropriate ports as noted during removal and tighten the union nuts securely.
9. Connect the electrical connector of the ECU.
10. Install the battery tray and battery (refer to the chapter 5A). Install the air filter and air intake duct components removed for access as described in the relevant section chapter 4.
11. Remove the plastic from the brake fluid reservoir and bleed the entire hydraulic system as described in paragraph 2.
Electronic control unit
12. The electronic control unit is removed together with the modulator, as described above. The BEU is an integral part of the modulator, and these elements cannot be separated from each other.
Front wheel speed sensor
Note: When installing the sensor, apply thread locking compound to the sensor mounting stud.
Removal
13. Disconnect the ground cable from the battery (see "Disconnecting the battery").
14. Fully apply the parking brake. Raise the front of the vehicle and support it securely (see "Lifting and installing the car on supports"). Remove the corresponding front wheel.
15. Release the wheel speed sensor wiring from the brackets on the suspension strut and the engine compartment mudguard.
16. Trace the wiring from the sensor and disconnect the electrical connector. Make a note of how the electrical wiring is routed to ensure proper installation.
17. Loosen the nut and remove the wheel speed sensor protective cover (figure 20.17).
Figure 20.17. Loosen the nut and remove the protective cover from the wheel sensor
Removal
18. Unscrew the stud and remove the sensor from the steering knuckle (figure 20.18, a, b).
Figure 20.18, a. Unscrew the pin...
Figure 20.18, b....and remove the front wheel sensor from the steering knuckle
(Original can be viewed at PeugeotBook)
Installation
19. Installation is carried out in the reverse order of removal, taking into account the following points:
- a) Before installation, clean the mating surfaces of the sensor and steering knuckle and apply a small amount of high-temperature brake grease to the sensor installation location in the steering knuckle.
- b) Clean the surface of the sensor tip.
- c) Apply thread locking compound to the sensor mounting stud threads and tighten the stud to the specified torque.
- d) Route the wiring as noted before removal.
Rear wheel speed sensor
Note: When installing, apply thread locking compound to the sensor mounting stud.
Removal
20. Place wheel chocks under the front wheels. Raise the rear of the vehicle and place secure supports underneath it (see "Lifting and installing the car on supports"). Remove the corresponding wheel.
21. Trace the wiring from the sensor to the appropriate electrical connector, then release the electrical connector from the appropriate clamp and disconnect the wiring from the main wiring harness.
22. Trace the sensor wiring and release it from the clamps. Make a note of how the electrical wiring is routed to ensure proper installation.
23. Unscrew the bolt securing the sensor to the trailing arm and remove the sensor assembly with the wire.
Installation
24. Installation is performed in sequence. reverse removal, taking into account the following points:
- a) Before installation, clean the mating surfaces of the sensor and trailing arm and apply a small amount of high-temperature brake grease to the sensor installation location in the trailing arm.
- b) Clean the surface of the sensor tip.
- c) Apply thread locking compound to the sensor mounting stud threads and tighten the stud to the specified torque.
- d) Route the wiring as noted before removal.