Mazda 3 since 2003
	1. Operation and maintenance of the car
	2. Engine
	3. Transmission
	4. Running gear
	5. Steering mechanism
	6. Brake system
		6.1. General information
		6.2. Brake system
			6.2.1. Check and adjustment of elements of the brake system
			6.2.2. Check of level of brake fluid in a tank of a hydraulic actuator of the working brake system
			6.2.3. Removal of air from the brake system
			6.2.4. Check of the backpressure valve of a vacuum hose (amplifier of brakes)
			6.2.5. Removal and installation of a vacuum hose (amplifier of brakes)
			6.2.6. Removal and installation of a pedal of a brake
			6.2.7. Removal and installation of the main brake cylinder
			6.2.8. Check of the sensor of level of liquid
			6.2.9. Removal and installation of the vacuum amplifier of brakes
			6.2.10. Check of the vacuum amplifier of brakes
			6.2.11. Dismantling and assembly of the main cylinder
			6.2.12. Removal and installation of a forward brake disk
			6.2.13. Replacement of front brake shoes
			6.2.14. Removal and installation of the back disk brake mechanism
			6.2.15. Check of the parking brake system
			6.2.16. Removal, check and installation of the back sensor of speed of a wheel of ABS
			6.2.17. Removal and installation of the hydraulic block of anti-blocking system of brakes
		6.3. Tables
	7. Onboard electric equipment
	8. Body

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.

Fig. 6.10. Scheme of check of the backpressure valve

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.