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
Disconnect the wiring block from the brake fluid level sensor
Unscrewing the tank cap
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
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
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.
Unscrew the two nuts securing the main brake cylinder to the vacuum booster
Removing the main brake cylinder
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
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
We pry with a screwdriver and remove the two holders of the sound insulation lining
Removing the overlay
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
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.
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.