We replace the brake master cylinder and vacuum brake booster if defects occur.
Defects of the main brake cylinder, in which it should be repaired or replaced:
- - contamination of the main cylinder or heavy wear of its mirror;
- - wear or damage to the master cylinder piston cuff;
- - cuff swelling;
- - compensation holes are clogged (the car brakes spontaneously)
We replace the vacuum brake booster when it fails.
If the vacuum booster is faulty, the force on the brake pedal increases significantly.
If the force on the brake pedal increases noticeably during braking, you need to check the booster on a stationary car.
With the engine off, press the brake pedal five or six times on the brake pedal.
Holding the brake pedal down, start the engine.
The brake pedal should move forward.
If this does not happen, then the vacuum booster or the check valve of the vacuum booster does not work, and the hose of the vacuum booster may also not be tight.
Removing the brake master cylinder reservoir
Disconnect the wire from the negative battery terminal
Disconnect the wiring harness from the brake fluid level sensor
Unscrew the tank cap
We pump out the brake fluid from the reservoir with a rubber bulb or syringe
Prying off with a screwdriver, remove the tank, removing its pipes from the connecting pipes
Remove the connecting sleeves.
Install the tank in reverse order
Removing the brake master cylinder
You will need a special wrench for 11 for the brake pipes and a wrench for 13.
Disconnect the negative battery terminal
We unscrew the nuts securing four pipelines to the cylinder and take the tubes to the side.
For clarity, the master cylinder reservoir has been removed.
We muffle the holes of the brake pipes using available methods.
Unscrew the two nuts securing the master brake cylinder to the vacuum booster
Remove the brake master cylinder
The flange of the brake cylinder is sealed with a rubber ring.
Install the brake master cylinder in reverse order.
Pour the brake fluid into tank and pump the brake system (Replacing the brake fluid and pumping the brakes Renault Sandero)
Replacing the vacuum brake booster
Disconnect the negative battery terminal
Disconnect the non-return valve with a connected hose from the vacuum booster
We unscrew the two nuts securing the brake master cylinder, as described above.
Remove the master cylinder, forward without disconnecting the brake pipes from it
Pry off with a screwdriver and remove the two holders of the noise-insulating lining
Remove the overlay
Disconnect the pusher of the vacuum booster from the brake pedal, for which we unfasten the spring finger lock from the pedal
Squeezing the plastic retaining ring, remove the finger from the holes of the pedal and pusher fork
We unscrew the four nuts securing the vacuum brake booster to the bulkhead
Remove the vacuum booster
Install the vacuum booster 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.