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IV. Air Discharge and Oil Refill
1. Regular Operation Procedure
The regular operation procedure of air discharge and oil refill is shown in the figure, of which:
A : Move the vacuum device and brake oil refill device;
B : Start after connected with vacuum and brake oil refill device and SDL;
C : Drive normal close electromagnetic valve and apply the 1
st
vacuum;
D : Excessive leakage test;
E : Minor leakage test after the 1
st
vacuum cut-off;
F : Applicable for 2
nd
vacuum and drive motor;
G : After the oil refill and maintaining of pressurization on the brake oil, relieve the brake oil pressure, stop
the normal close electromagnetic valve and motor, and adjust the brake oil level;
H : Disconnect the vacuum device and brake liquid refiller;
I : Screw on the oil reservoir lid/disconnect the SDL;
J : Transfer to next step.
2. Checking Device
① The vacuum supplied to the oil reservoir should be as lower as possible, provided that the oil gun must
supply at least below 1mm Hg vacuum.
② Confirm if the air discharge screw portion of the rear wheel hydraulic device (drum brake or brake
caliper) forms the vacuum within the specified period. (It should be below 5~10mm Hg after connected
with vacuum for 20~25s).
③ Confirm if the working voltage supplied to the HECU is at specified 10~12V.
④ Confirm the circulation time (C/T). Confirm the working time setting of the electromagnetic valve
meets with the specified value.
† C/T< 90: Run the electromagnetic valve continually;
† 90≤C/T≥180: Start the electromagnetic valve for 2s and stop the electromagnetic valve for 2s.
continually repeat above cycles;
† C/T>180: The total running period setting of the electromagnetic valve is below 90s.
3. Notices for Air Discharge and Oil Refill
Add brake fluid
Close Valve
Motor
Vacuum
Procedures
Off
Off
Off
Off
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