Brake Booster Inspection
Special Tools Required

Pressure gauge joint pipes, 12 x 1.0 mm
 07HAK-SG00110

Pressure gauges set
 07YAJ-0010410

Vacuum gauge
 07YAJ-0010610

Attachment
 07410-5790102

Tube joint adapter
 07410-5790503
Leak Test
  1. Install the vacuum gauge (A) between the brake booster and check valve.
  1. Start the engine, adjust the engine speed with the accelerator pedal so that the vacuum gauge readings show 97.3 kPa (730 mmHg, 28.7 in.Hg), then stop the engine.
  1. Read the vacuum gauge.
    If the vacuum reading decreases 2.7 kPa (20 mmHg, 0.8 in.Hg) or more after 30 seconds, check following parts for leaks.
    • Check valve
    • Vacuum hose, pipe
    • Seals
    • Brake booster
    • Master cylinder
    NOTE: Do not try to disassemble the brake booster. Replace the brake booster as an assembly with a new one.