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1. Press a pedal of a brake of 5-6 times at the idle engine to create in cavities of the vacuum amplifier the identical pressure close to the atmospheric. At the same time on the effort enclosed to a pedal, define, whether there is no jamming of the case of the valve. |
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2. Having stopped a brake pedal in the middle of its course, start the engine. At the serviceable vacuum will strengthen le a brake pedal after start of the engine should leave forward. If the pedal does not leave forward, check fastening of a tip of a hose, a condition and fastening of a flange of a tip in the amplifier, a condition of a hose and unions. |
| 3. Check a condition of the unidirectional valve on wear and damage and, if necessary, replace. The valve can be checked, blowing it air in both directions. It should pass air from the vacuum amplifier of brakes to a vacuum hose. |
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