Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 555 (CONVENTIONAL BRAKE SYSTEM)POWER BRAKE UNIT INSPECTIONPOWER BRAKE UNIT FUNCTION CHECK (INSPECTION USING THE TESTERS)CHECKING FOR VACUUM LOSS (LOADED CONDITION)
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Checking for vacuum loss (loaded condition)
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Checking for vacuum loss (loaded condition)
WARNING: This page is about a different car, the 2007 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Start the engine.
- Depress the brake pedal with a force of 196 N {20 kgf, 44 lbf}.
- Stop the engine when the vacuum gauge reading reaches 66.7 kPa {500 mmHg, 19.7 inHg}.
- Observe the vacuum gauge for 15 s.
- If the gauge shows 63.3-66.7 kPa {475-500 mmHg, 18.7-19.6 inHg}, the unit is operating.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.