The main cylinder of the brakes and the vacuum brake booster are replaced in case of defects.

Defects of the main brake cylinder, which should be repaired or replaced:

- contamination of the main cylinder or a large wear of its mirror;

- wear or damage to the piston cuff of the main cylinder;

- swelling of cuffs;

- the compensation holes are clogged (spontaneous braking of the car occurs)

The vacuum brake booster is replaced when it fails.

If the vacuum booster is faulty, the force on the brake pedal increases significantly.

If the force on the brake pedal has noticeably increased during braking, you need to check the amplifier on a stationary car.

When the engine is not running, we press the brake pedal five or six times on the brake pedal. Holding the brake pedal in the pressed position, start the engine.

The brake pedal should move forward. If this does not happen, then the vacuum amplifier or the check valve of the vacuum amplifier does not work, and the vacuum amplifier hose may also not be sealed.

Removing the brake master cylinder tank

Disconnect the wire from the negative terminal of the battery

Replacement of the main cylinder of brakes and vacuum booster Renault SanderoReplacement of the main cylinder brakes and vacuum booster Renault Sandero

Disconnect the wiring block from the brake fluid level sensor

Unscrewing the tank cap

Replacement of the brake master cylinder and Renault Sandero vacuum boosterReplacement of the main cylinder brakes and vacuum booster Renault Sandero

We pump out the brake fluid from the tank with a rubber bag or a syringe

Using a screwdriver, we remove the tank, removing its nozzles from the connecting tubes

Replacement of the main cylinder brakes and vacuum booster Renault Sandero

We take out the connecting bushings.

Installing the tank in reverse order

Removing the main brake cylinder

You will need a special key for 11 brake tubes and a key for 13.

Disconnect the negative battery terminal

Replacement of the main cylinder brakes and vacuum booster Renault Sandero

Unscrew the nuts of the attachment to the cylinder of the four pipelines and pull the tubes aside.

For clarity, the tank of the main brake cylinder has been removed.

Jamming the holes of the brake tubes in the available ways.

Replacement of the brake master cylinder and Renault Sandero vacuum boosterReplacement of the main cylinder brakes and vacuum booster Renault Sandero

Unscrew the two nuts securing the main brake cylinder to the vacuum booster

Removing the main brake cylinder

Replacement of the main cylinder brakes and vacuum booster Renault Sandero

The flange of the brake cylinder is sealed with a rubber ring.

Install the main brake cylinder in reverse order.

Fill the brake fluid into the tank and pump the brake system (Replacement of brake fluid and pumping brakes Renault Sandero)

Replacement of the vacuum brake booster

Disconnect the negative battery terminal

Replacement of the brake master cylinder and Renault Sandero vacuum boosterReplacement of the main cylinder brakes and vacuum booster Renault Sandero

Disconnect the check valve with the connected hose from the vacuum amplifier

Unscrew the two mounting nuts of the main brake cylinder, as described above.

We pull the main cylinder forward without disconnecting the brake tubes from it

Replacement of the brake master cylinder and Renault Sandero vacuum boosterReplacement of the main cylinder brakes and vacuum booster Renault Sandero

We pry with a screwdriver and remove the two holders of the sound insulation lining

Removing the overlay

Replacement of the brake master cylinder and Renault Sandero vacuum boosterReplacement of the main cylinder brakes and vacuum booster Renault Sandero

Disconnect the pusher of the vacuum booster from the brake pedal, for which we detach the spring lock of the finger from the pedal

Squeezing the plastic locking ring, we remove the finger from the holes of the pedal and the pusher fork

Replacement of the brake master cylinder and Renault Sandero vacuum boosterReplacement of the main cylinder brakes and vacuum booster Renault Sandero

Unscrew the four nuts securing the vacuum brake booster to the front panel

Removing the vacuum booster

We install the vacuum amplifier in reverse order.

Replacement of the main cylinder brakes and vacuum booster Renault Sandero

Before installation, you need to check the dimensions of the amplifier, and if necessary, restore them by rotating the adjusting bolt of the amplifier rod.