Attach a control pressure gauge in the same way as for checking the air pressure in the pressure accumulator.
Let the engine idle until it reaches maximum pressure, then stop the engine.
Relieve the pressure to approximately 135 kg/cm2 by depressing the brake pedal several times.
The pressure must not fall below 130 kg/cm2 for 5 minutes. If the pressure drops by a large amount, replace the pressure accumulator due to leaks in the non-return valve.
Relieve pressure by depressing the brake pedal several times.
Disconnect the control pressure gauge, replace the hydraulic fluid pressure indicator lamp sensor, bleed the brake hydraulic system to remove air.
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