db57d230

13.5. Check of the vacuum amplifier of brakes

PERFORMANCE ORDER
1. Start the engine and in 1–2 minutes stop it. Press a brake pedal with usual effort. If the first course of a pedal the long and second course is shorter, than the first course – it demonstrates normal operation of the vacuum amplifier of brakes.
2. At the switched-off engine several times press a brake pedal. Start the engine. If the pedal of a brake moves down at once after launch of the engine, it demonstrates normal operation of the vacuum amplifier of brakes.
3. Start the engine.
Press a brake pedal with usual effort. Stop the engine. Slowly press a pedal of a brake and hold it pressed during 30 pages. If height of a pedal does not change, the vacuum amplifier of brakes works normally.

Otherwise, check the unilateral vacuum valve or a vacuum hose for absence of damage and check reliability of their fastenings.