Check, removal and installation of the vacuum brake booster

Check of the vacuum amplifier spend in the following order:

- Click 5-6 times on the brake pedal with the engine off, to create a vacuum and atmospheric chambers of the vacuum amplifier the identical pressure close to atmospheric (remove the vacuum discharge);

- Hold the brake pedal down, start the engine;

- At serviceable vacuum amplifier the pedal after the engine has to "go forward" and should weaken the force of resistance to foot by increasing the vacuum;

- If the brake pedal is not "go forward", check the tightness of the connecting hose between the inlet channel and the amplifier or the serviceability of the vacuum booster;

- Let the engine run for about two minutes, and then turn it off. If you then press the brake pedal, the force should be the same as usual, but the next time you press the pedal should become more "hard" and pedal should decrease with each pressing.

The cause of the vacuum amplifier can also be a non-return valve, and for vehicles with diesel engines check the operation of the vacuum pump. Use a screwdriver to gently squeeze the valve and blow it in the direction of the arrow, which is stamped on the valve. While blowing air exits from the other side of the valve. If you lean against the embossed arrow on the valve, the air, on the contrary, should not go on the other side. When installing the valve is pressed into the vacuum brake servo.