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 407 (CONVENTIONAL BRAKE SYSTEM)POWER BRAKE UNIT INSPECTIONPOWER BRAKE UNIT FUNCTION CHECK (INSPECTION USING THE TESTERS)CHECKING FOR HYDRAULIC PRESSURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Checking for hydraulic pressure
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Checking for hydraulic pressure
WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- When the engine is stopped (vacuum 0 kPa {0 mmHg, 0 inHg})
and the fluid pressure is within the specification, the unit is operating.POWER BRAKE UNIT FLUID PRESSURE SPECIFICATION - ENGINE NOT STARTED
Pedal force Fluid pressure Rear disc brake 200 N {20 kgf, 44 lbf 680 kPa {6.93 kgf/cm2 , 98.6 psi} min. Rear drum brake {8.06 kgf/cm2 ,115 psi} min. - Start the engine. Depress the brake pedal when the vacuum reaches 66.7 kPa {500 mmHg, 19.7 inHg}.
- If the fluid pressure is within the specification, the unit is operating.
- If the fluid pressure is not as specified, inspect for damage to the check valve or vacuum hose, and fluid leakage of the hydraulic line. Repair as necessary, and inspect again.
POWER BRAKE UNIT FLUID PRESSURE SPECIFICATION - ENGINE STARTEDPedal force Fluid pressure Rear disc brake 200 N {20 kgf, 44 lbf} 8,900 kPa {90.75 kgf/cm2 , 1,291 psi} min. Rear drum brake 8,830 kPa {90.04 kgf/cm2 ,1,280 psi} min.
RENDER: 1.0x
NO RELATED
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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.