Vacuum brake booster (Renault Kangoo 1)

Special tools and equipment required

• Mot. 453-01 Hose clamp.
• Vacuum pump.

Tightening torques, Nm

• Vacuum booster mounting nut 18.
• Nut for fastening the vacuum booster to the front shield 23.

The vacuum booster cannot be repaired. It is allowed to perform work related to the air filter and check valve.

Removal

1. Disconnect the wires from the battery and remove it.

2. Remove the brake master cylinder (follow the method described earlier).

3. Remove the battery heat shield (4 bolts, 1 nut).

4. Remove the two expansion tank mounting nuts and move it towards the engine.

5. Disconnect the vacuum tube from the vacuum booster.

6. Remove from the passenger compartment:

• finger A from the fork connecting the brake pedal to the push rod, moving the clamp;

• four nuts securing the vacuum booster;
• vacuum booster.

Installation

1. Before installation, check the dimensions: L = 104.8 mm and X = 22.3 mm.



2. Installation is carried out in the reverse order of removal.

3. Remove air from the hydraulic circuit.

Checking for leaks

Caution! When checking the vacuum booster for leaks, ensure the required tightness between the vacuum booster and the master cylinder. If there are leaks, replace the sealing ring A.

The tightness of the vacuum booster is checked on a vehicle with a hydraulic circuit in working condition.

1. Connect a vacuum pump between the vacuum booster and the vacuum source (intake manifold) using a tee and the shortest possible tube.



2. Let the engine idle for one minute.

3. Clamp the tube between the tee and the vacuum source.



4. Turn off the engine.

5. If the vacuum drops by more than 33 mbar (25 mm Hg.) within 15 seconds, then there is a leak located:

• or in the check valve (replace it);
• or in the piston diaphragm (replace the vacuum booster).

6. If the vacuum booster is not working, the braking system will work, but the force applied to the pedal to achieve deceleration, as with the booster working, will be much greater.

Replacing the air filter

1. To replace the air filter F, it is not necessary to remove the vacuum booster.

2. Remove the dirty filter from the bottom of the pedal mounting bracket using a screwdriver or a metal hook.

3. Cut the new filter in area A and install it around the push rod.

4. Then press it into place, making sure that the filter completely fills the hole, thereby preventing unfiltered air from entering the vacuum booster.

Replacing the check valve

1. The operation can be performed on a vehicle.

2. Disconnect the vacuum tube from the vacuum booster.

3. Pull the check valve out by rotating it to remove it from the rubber sealing washer.



4. Check the condition of the rubber sealing washer and check valve.



5. Replace faulty parts.

6. Install the unit back into place.