Attach a control pressure gauge in the same way as for checking the air pressure in the pressure accumulator.
Let the engine idle until the maximum pressure in the hydraulic brake system is established. If it is less than 140 kg/cm2, then replace the pressure accumulator.
Relieve pressure by depressing the brake pedal several times.
Remove the control pressure gauge, reinstall the hydraulic fluid pressure warning lamp sensor in the hydraulic brake system and bleed the hydraulic brake system.
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