With Traction Control System (TCS)
A: RULES FOR EFFECTIVE BLEEDING1. For Traction Control System (TCS) vehicle, brake fluid is sent out from master cylinder during ABS and TCS operation. This is because suction pipe is installed between master cylinder and hydraulic unit in TCS vehicle.
2. Pressure is not applied to suction pipe by depressing brake pedal. When any of the following are performed, bleed air from suction pipe by air bleeding control operation.
(1) When brake pipe is disconnected from master cylinder.
(2) When brake pipe between hydraulic unit and master cylinder is disconnected.
(3) When fluid is emptied from reservoir tank.
3. The time interval between two brake pedal operations (from the time when the pedal is released to the time when it is depressed another time) shall be approximately 3 seconds.
4. The air bleeder on each brake shall be released for 1 to 2 seconds.
B: BLEEDING PROCEDURE WITH AIR BLEEDING CONTROL
1. Bleeding Procedure
CAUTION:
- The FMVSS No. 116, fresh DOT3 or 4 brake fluid must be used.
- Cover bleeder with waste cloth, when loosening it, to prevent brake fluid from being splashed over surrounding parts.
- Avoid mixing different brands of brake fluid to prevent degrading the quality of the fluid.
- Be careful not to allow dirt or dust to get into the reservoir tank.
- During bleeding operation, keep the brake reserve tank filled with brake fluid to eliminate entry of air.
NOTE:
- Brake pedal operating must be very slow.
- For convenience and safety, it is advisable to have two men working.
1. Start air bleeding control operation.
2. Make sure that there is no leak from joints and connections of the brake system.
3. Bleed air through front RH caliper by operating brake pedal.
1. Fit one end of vinyl tube into the air bleeder and put the other end into a brake fluid container.
2. Slowly depress the brake pedal and keep it depressed. Then, open the air bleeder to discharge air together with the fluid.
Release air bleeder for 1 to 2 seconds.
Next, with the bleeder closed, slowly release the brake pedal.
Repeat these steps until there are no more air bubbles in the vinyl tube.
Allow 3 to 4 seconds between two brake pedal operations.
CAUTION: Cover bleeder with waste cloth, when loosening it, to prevent brake fluid from being splashed over surrounding parts.
NOTE: Brake pedal operating must be very slow.
4. Bleed air from suction pipe through front RH caliper.
1. Open the air bleeder.
2. Keep pressing Traction Control System (TCS) OFF switch for 20 seconds or more.
NOTE: Ensure no air comes out from air bleeder.
3. Close the air bleeder.
5. Bleed air through front LH caliper by operating brake pedal. This is the same procedure as step 3.
6. Bleed air from suction pipe through front LH caliper. This is the same procedure as step 4.
7. Bleed air through front RH and LH calipers by operating brake pedal. This is the same procedure as step 3. Repeat steps 3 to 7 until air does no longer comes out.
8. Tighten air bleeder securely when no air bubbles are visible.
Air bleeder tightening torque: 8 ± 1 Nm (0.8 ± 0.1 kg-m, 5.8 ± O.7 ft. lbs.)
9. Bleed air through rear LH and RH caliper by operating brake pedal. This is the same procedure as step 3.
10. Tighten air bleeders securely when bubbles are visible.
Air bleeder tightening torque: 8 ± 1 Nm (0.8 ± 0.1 kg-m, 5.8 ± 0.7 ft. lbs.)
11. Operate FRO (Front Right Outlet) valve and RLO (Rear Left Outlet) valve to bleed air from hydraulic unit outlet circuit.
1. Press TCS OFF switch while depressing brake pedal.
2. Make sure ABS warning light illuminates.
3. Repeatedly depress and release brake pedal 10 times or more while pressing TCS OFF switch.
NOTE:
- Air comes out from reservoir tank.
- Repeat the above procedures until air no longer comes out of reservoir tank.
12. Operate FLO (Front Left Outlet) valve and PRO (Rear Right Outlet) valve to bleed air from hydraulic unit outlet circuit.
1. Press TCS OFF switch while depressing brake pedal.
2. Make sure TCS warning light illuminates.
3. Repeatedly depress and release brake pedal 10 times or more while pressing TCS OFF switch.
NOTE:
- Air comes out from reservoir tank.
- Repeat the above procedures until air no longer comes out of reservoir tank.
- The operations in steps 4, 6, 11 and 12 above can be switched each other by operating brake pedal (stop light switch).
13. Perform these steps for the brakes connecting to the secondary chamber of master cylinder, first, and then for the ones connecting to primary chamber. With all procedures completed, fully depress the brake pedal and keep it in that position for approximately 20 seconds to make sure that there is no leak evident in the entire system.
14. Turn ignition switch OFF.
15. Perform TCS sequence control.
16. Check the pedal stroke.
While the engine is idling, depress the brake pedal with a 490 N (50 kg, 110 lbs.) load and measure the distance between the brake pedal and steering wheel. With the brake pedal released, measure the distance between the pedal and steering wheel again. The difference between the two measurements must be more than specified.
Specified pedal stroke: 95 mm (3.74 inch)
When depressing brake pedal with a 490 N (50 kg, 110 lbs.) load.
If the distance is more than specifications, there is a possibility air is in the inside of the brake line. Bleed air from the brake line.
17. Turn ignition switch OFF.
18. Disconnect select monitor or diagnosis terminal.
19. Add brake fluid to the required level (MAX. level) of reserve tank.
20. As a final step, test run the vehicle at low speed and apply brakes relatively hard 2 to 3 times to ensure that brakes provide normal braking action on all four wheels without dragging and uneven braking.
2. Conditions For Air Bleeding Control
3. Conditions For Completion Of Air Bleeding Control
When any of the following conditions occurs, ABS and TCS warning lights illuminate. Air bleeding control stops, while the ABS and TCS function will then stop. The brake system functions as a conventional brake system.
1. When the speed of at least one wheel reaches 10 km/h (6 MPH).
2. When terminal No. 4 is separated from diagnosis terminal. (When scan tool is not used.)
3. When pump motor remains ON for two minutes.
4. When TCS valve remains open for two minutes.
5. When outlet valve remains open for two minutes.
6. When malfunction is detected.
NOTE: When malfunction has been detected and the air bleeding control operation has stopped, the trouble codes are stored in memory.
C: AIR BLEEDING CONTROL WITH DIAGNOSES CONNECTOR
1. Connect diagnosis terminals to terminal No. 4 of the diagnosis connector beside driver's seat heater unit.
2. Start the engine while pushing Traction Control System (TCS) OFF switch.
NOTE: Keep the TCS OFF switch depressed even after the engine has started.
3. After ABS and TCS warning lights go out, depress brake pedal within 0.5 seconds.
4. After ensuring TCS ON indicator illuminates, release TCS OFF switch.
5. Air bleeding control operation starts.
D: AIR BLEEDING CONTROL WITH SELECT MONITOR
1. Connect scan tool to data link connector beside driver's seat instrument panel lower.
(1) Data link connector (for Subaru scan tool and OBD-II general scan tool).
(2) Data link connector (for Subaru scan tool).
NOTE: When using data link connector (1) above, use Special Tool (ST) 498357200 ADAPTER CABLE or equivalent.
2. Start the engine.
3. Change scan tool to Traction Control System (TCS) mode by pressing the function key.
4. Press FD3 ENT key.
5. When the message shown in the figure is displayed, press ENT key.
6. Air bleeding control operation starts.
7. Scan tool indicates that air bleeding control is now operating.
8. When air bleeding control cannot be started (by system malfunction, etc.), the message shown in the figure will be displayed.
NOTE: Read the trouble codes. Repair faulty parts.