Contents: Hydraulic block 🠛 Electronic control device 🠛 Front wheel speed sensor 🠛 Rear wheel sensor - except Scenic…🠛 Rear Wheel Sensor - Scenic Models 🠛
Hydraulic block
Before unscrewing the brake pipe couplings, disconnect the ground cable from the battery and do not reconnect it until you have bled the system. If you do not do this, air can enter the hydraulic unit, which is very difficult to (in some cases it is impossible) to bleed. When disconnecting the battery on Scenic models, refer to Section Charging and starting systems.
Note: Before you begin, please refer to the Warning provided at the beginning of this Section Bleeding the brake hydraulic system. To seal the hydraulic unit couplings after disconnecting the tubes, plugs will be required.
Removal
1. Disconnect the ground cable from the battery (on Scenic models, refer to Section Charging and starting systems).
2. Set the handbrake, then jack up the front of the car and place it on axle stands. Remove the right front wheel.
3. Loosen the fasteners and remove the wheel arch liner.
4. Release the retaining clip and disconnect the electrical connector from the base of the hydraulic unit.
5. Minimize fluid loss by placing a piece of polyethylene under the master cylinder reservoir cap.
6. Mark the locations of the brake pipes to avoid confusion during installation. Unscrew the union nuts and separate the pipes from the hydraulic unit. Be prepared for fluid to escape. Plug the holes in the unit and pipes to prevent dirt from entering and further fluid loss.
Note: If the hydraulic unit couplings are not plugged securely, air may enter the hydraulic unit pump (see Warning at the beginning of this Section).
7. Loosen the hydraulic unit mounting bolts and remove the assembly from the engine compartment.
Installation
1. Perform installation in reverse order, paying attention to the following:
a) Before connecting, make sure that the pipes and couplings of the hydraulic unit are filled with liquid (refer to Section Bleeding the brake hydraulic system). Install the tubes, each in the previous coupling, and tighten the union nuts to the specified Specifications effort.
- b) Make sure the wiring connector is secured with a bracket.
- c) Bleed the brake hydraulic system as described in Section Bleeding the brake hydraulic system, then connect the battery.
- d) Finally, have your Renault service centre check the operation of the ABS system using special diagnostic equipment.
Electronic control device
Removal
1. Follow the steps in paragraphs 1-4 above.
2. Loosen and remove the hydraulic unit and bracket bolts, then carefully move the bracket away from the unit. Tie the hydraulic unit to the body so as not to stretch the brake pipes.
3. Loosen the mounting screws, then move the control unit away from the hydraulic unit and remove it from the vehicle.
Installation
1. Perform installation in reverse order.
Front wheel speed sensor
Removal
1. Disconnect the ground cable from the battery (on Scenic models, refer to Section Charging and starting systems).
2. Set the handbrake, then jack up the front of the car and support it on axle stands. Remove the wheel for easier access.
3. Trace the wiring from the sensor, releasing it from all the brackets and marking its location, and disconnect the connector.
4. Loosen and remove the mounting bolt and remove the sensor from the steering knuckle.
Installation
1. Clean the mating surfaces of the sensor and steering knuckle and apply a small amount of multi-purpose grease to the steering knuckle bore.
2. Make sure the tip of the sensor is clean and place it in the steering knuckle. Install the mounting bolt and tighten it to the specified Specifications effort.
3. Route the sensor wiring using the marks made when removing it and secure it with all the clamps and ties. Connect the wiring connector, then lower the car to the ground and tighten the wheel bolts to the specified Specifications effort.
Rear wheel sensor - except Scenic models
Removal
1. Block the front wheels, then jack up the rear of the car and support it on axle stands. Remove the wheel for easier access.
2. Trace the wiring from the sensor, releasing it from all the brackets and marking its location, and disconnect the connector.
3. Loosen and remove the mounting bolt and remove the sensor.
Installation
1. Clean the mating surfaces of the sensor and drum brake backing plate and apply a small amount of general purpose grease to the sensor housing.
2. Make sure the tip of the sensor is clean and install it in the working position. Insert the mounting bolt and tighten it to the specified Specifications effort.
3. Route the sensor wiring using the marks made when removing it and secure it with all the clamps and ties. Connect the wiring connector, then lower the car to the ground and tighten the wheel bolts to the specified Specifications effort.
Rear Wheel Sensor - Scenic Models
Removal
1. Block the front wheels, then jack up the rear of the car and place it on axle stands. Remove the wheel.
2. Loosen and remove the sensor mounting bolt.
3. Trace the wiring from the sensor, releasing it from all the brackets and marking its location, and disconnect the connector.
4. Loosen the four bolts securing the steering knuckle assembly to the lower control arm, then remove all but the lower rear bolt (refer to the accompanying illustration).
Note: New bolts will be required for installation.
5. Bring the drum/steering knuckle assembly out so that the sensor can be removed. It will probably be necessary to back off the remaining bolt almost to the end of the threads.
Installation
1. Clean the mating surfaces of the sensor and drum brake backing plate and apply a small amount of general purpose grease to the sensor housing.
2. Make sure the tip of the sensor is clean and place it in the working position. Install the mounting bolt and tighten it to the specified Specifications effort.
3. Install the new steering knuckle mounting bolts and tighten them in the diagonal sequence shown in Specifications effort.
4. Route the sensor wiring using the marks made when removing it and secure it with all the clamps and ties. Connect the wiring connector, then lower the car to the ground and tighten the wheel bolts to the specified Specifications effort.