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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Conventional Brake System >> Power Brake Unit Inspection >> Using SST >> Hydraulic pressure inspection

Hydraulic pressure inspection

  1. Start the engine. Depress the brake pedal when the vacuum reaches 66.7 kPa {500 mmHg, 19.7 inHg}.
  2. At this time, apply the indicated pedal force and if the fluid pressure is within the specification, the unit is normal.

Master cylinder fluid pressure 

Vacuum amount at 66.7 kPa {500 mmHg, 19.7 inHg}
Pedal force Fluid pressure
200 N {20.4 kgf, 45.0 lbt} 6, 810 kPa {69.44 kgf/cm 2 , 987.7 psi} or more