140Section 2 Brake FluidBleeding1. Fill brake reservoir with brake fluid
Brake fluid: JG4 GB10830
2. Bleed brake pipeline system
(1) Connect the vinyl pipe to the wheel cylinder bleeder plug port
(2) Depress the brake pedal several times, and then loosen the bleeder plug with the pedal held down.
(3) At the point when fluid stops flowing out, tighten the bleeder plug, and then release the brake pedal.
(4) Repeat (2) and (3) until all the air in the fluid has been bled out.
(5) Repeat the above procedure to bleed the brake pipeline of the air for each wheel cylinder.
Notice: Fill brake fluid into the reservoir all the time when bleeding.
3. Check fluid level in reservoir
Check the fluid level and fill fluid if necessary.Symptom Suspe ct a re a
1. Whee l cylinder piston (stuck)
2. Bra ke shoe lining (oily)
3. Disc (scratched)
4. Bra ke shoe s or lining (c ra cke d or distorte d)
5. Whee l hub be a ring (worn or da mage d)
Tire pressure (not as specified)
1. Bra ke shoe lining (da mage d)
2. Insta lla tion bolt (loose )
3. Disc (scratched)
4. Bra ke shoe (ba d in qua lity)
5. Bra ke shoe s lining (oily)
6. Sound isolating shim da mage d
7. Hold spring of bra ke shoe (da mage ) Brake Deviation
Noise from brake
286 4 Exce s s ive ly long brak e pe dal s trok e Lik e ly Caus e s
[De s cription]
Visually inspect whether there
is leakage or mechanical fault. Use bleeding
method to check whether there is air in the
system. Use the HCU function of the scan
meter to test whether the normally-closed valve
is le a king. z Brake fluid leakage
z Air in the system
z Brake disc severely worn
z B r a ke f luid le ve l s w it c h f a ult yTighten the pipe connector as
specifiedVisually inspect whether the hydraulic pipe connector is
leaking Check the brake disc wearReplace the brake disc Abn. Ok Abn. Check the brake fluid level switchOk Bleed and checkOk Use the scan meter HCU to diagnose and check the nor-
mally-closed valve sealOkReplace the brake fluid level
switch Abn.Re-bleed the system Abn.Replace the HCU Abn.
296VII. Fill the liquid and bleedAfter replacing the HECU, bleed the second HECU circuit in addition to the filling and bleeding of the regular
brake system. Use the scan meter to perform the following procedure:Fill the fluid and bleed based on the regular brake system
until there is no air bubble in the transparent hoseConnect the scan meter with the diagnostic interfaceSelect function 04, Press OK button to confirmDepress the brake pedal and keep the hydraulic cylinder pushrod reboundRelease the brake pedal, loosen the left and right brake caliperbleeder screw, press "" buttonDepress the brake pedal 10 times, tighten the left and right
brake caliper bleeder screw, press "" buttonRepeat the above I II III steps 7 times and press "" buttonThe screen display the end of the bleed, press
"" button to return to "function selection" menuSelect function 06, Press OK button to confirm, quit the
diagnostic modeEnd →↑
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