How to check the backpressure valve

How to check the backpressure valve

The vacuum amplifier of brakes is the most widespread type of the amplifier applied in brake system of the modern car. At its breakage the effort on pressing of a pedal of a brake considerably increases that harmful influences on control of car. That it was not, it is necessary to check the backpressure valve of the vacuum amplifier. As to make it?

It is required to you

Two rags (one for hands, another for details) and a screw-driver

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Instruction

1
First of all it is necessary to check tightness of connection of the union on an inlet pipe with a vacuum hose and according to the backpressure valve of the vacuum amplifier. Let's remind that tightness of connection is dense connections of details to each other. Between them there should not be openings, cracks, gaps and should not pass air. If you found something, it is necessary to replace the defined, damaged details. And if there are no external damages, and simply details are not tight, eliminate this defect and try to press a pedal of a brake of times 6, but do not forget that the engine has to be switched off thus. Whether then start the engine and look the brake pedal moved forward if is not present, then we continue check further.

2
To check the backpressure valve, it is necessary to weaken an inhaling of a collar of fastening and to disconnect a vacuum hose from the valve by means of a screw-driver. Then take out this valve from the case of the vacuum amplifier of brakes and put it for convenience on a rag at this time to wipe hands.

3
Put on the basis (nose) of a rubber pear the union of big diameter and squeeze it. The union is the piece of a pipe inserting the valve in the vacuum amplifier. But do not forget that thus via the valve there has to be all air. If near at hand there is no pear, the valve can be blown a mouth.

4
Release a rubber pear if the pear assumed the original form further, the valve is faulty (it passes air in both directions), it is necessary to replace it. And if it remained in the squeezed state, the valve is serviceable on what you and it is congratulated.