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6-2-4-proverka-obratnogo-klapana-vakuumnogo-shlanga-usilitel-tormozov.html
6.2.4. Check of the backpressure valve of a vacuum hose (amplifier of brakes)Remove collars and a vacuum hose.
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Fig. 6.10. Scheme of check of the backpressure valve
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Give serially vacuum and pressure to a vacuum hose from the engine and be convinced that air can go only to one party (fig. 6.10). If air passes in both directions, replace a vacuum hose.
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