V. Exhaust and Filling
1. Regular operation procedures (Fig. 3-19).
Fig. 3-19
Regular operation procedures of exhaust and filling:
A. Move vacuum device and brake oil filling device;
B. Start after connection of vacuum, brake oil filling devices and SDL;
C. Drive normally closed solenoid valve and use the first vacuum;
D. Excessive leak experiment;
E. Minim leak experiment after first vacuum separation;
F. Use the second vacuum and drive motor;
G. Reduce brake oil pressure after filling and pressure increase maintenance of brake
oil, stop normally closed solenoid valve and motor and adjust brake oil level;
H. Disconnect the connection of vacuum equipment and brake fluid filling equipment;
I. Cover the oil can lid/disconnect SDL;
J. Step into next step.
2. Equipment check
(1) The lower the vacuum degree, the better. Confirm that the oil gun should supply max
l vacuum of 1mmHg.
(2) Check whether vacuum is formed in the bleed screw of hydraulic equipment (drum
brake or caliper) of rear wheel within the specified time. (Should below 5 ~ 10 mmHg
after vacuum connection for 20 ~ 25 seconds.)
(3) Check whether working voltage to HECU is 10 ~ 12V as specified.
(4) Check cycle time (C/T) and if solenoid valve working time is in compliance with
specification.
1) C/T is below 90: keep solenoid valve working;
2) C/T is between 90 ~ 180 seconds: repeat the process of solenoid valve working for 2
seconds and then stopping for 2 seconds;
3) C/T is above 180 seconds: set total working time of solenoid valve below 90 seconds.
3. Notes on exhaust and oil filling
(1) When filling brake oil, if not to maintain the filling pressure for a certain period, the oil
level of the oil can will fall after finish of filling. As a result, additional brake oil or filling
pressure for a certain period is necessary.
(2) Usually the marked time of regular operation is the cycle time.
(3) As the inside of spare HECU is wet, exhaust mode operation is not necessary
(exhaust mode operation is defined in item 5 (6)); exhaust can be carried out to all
wheels directly (in order to meet performance and pedal sentience, exhaust mode
operation is preferred).
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