4.4.2. Check of operation of the vacuum amplifier of brakes

At failure of the vacuum amplifier the effort to brake pedals considerably increases that negatively affects driving.
If when braking the effort to pedals considerably increased in comparison with a usual state, check the amplifier of brakes on the motionless car.
It will be required to you: passatizh, rubber pear.
1. At the idle engine press five-six times a brake pedal. Holding a pedal in the pressed situation, launch the engine. The pedal of a brake has to move forward.
2. If it does not occur, check tightness of connections of a hose of the vacuum amplifier with the backpressure valve …
3. … and an inlet pipe, if necessary eliminate an air suction. If it does not yield positive result, then the amplifier is faulty and it needs to be replaced.
4. To check tightness of the vacuum amplifier, open a cowl and launch the engine for 1 min. Approximately through 30 with after the engine will be killed, press two times a brake pedal, at the same time characteristic hissing of the air entering in the amplifier has to be listened.
5. In addition check the backpressure valve of the amplifier at which malfunction depression in a vacuum cavity of the amplifier at change of loading of the engine does not remain or at its stop. For check, holding the valve, disconnect from it a vacuum hose.
6. Take out the valve from a rubber sealant of a flange of the amplifier and put on the valve union (short, bigger diameter) a rubber pear (for example, from the areometer)...
7.... also squeeze it.
8. If the valve is serviceable, the pear will remain compressed. If the pear is straightened, replace the valve and repeat check of the amplifier.
9. Establish into place the removed details as it should be, the return to removal.

Good advice
If malfunction of the amplifier is found, replace him new as works on repair of the amplifier are very labor-consuming, demand the corresponding skills and use of the special erection and adjusting facilities.