Brake Bleeding - Service Manual Procedure Correction
BULLETIN NUMBER ISSUE DATE GROUPSB86-09-001 July 3, 1986 BRAKES
VEHICLES AFFECTED
1985 and 1986 I-Mark (JT) models.
SERVICE INFORMATION
This Service Bulletin contains a revised procedure for bleeding the brake hydraulic system on 1985 and 1986 I-Mark (JT) models. This procedure completely replaces the procedure printed in the appropriate Workshop Manual.
On each Workshop Manual page number listed below, cross out the printed version of the brake
hydraulic system bleeding procedure and write in "Refer to Service Bulletin SB86-09-001."
1985 Workshop Manual Page No.
Publication No. AIMI-SVC-118 09-13
Part No. 2-90999-107-5
1986 Workshop Manual Page No.
Publication No. AIMI-SVC-128 09-13 and 09-14
Part No. 2-90999-107-6
SERVICE PROCEDURE
ADDING BRAKE FLUID:
BLEEDING THE BRAKE HYDRAULIC CIRCUIT
1. Operate the parking brake completely, then start the engine.
Note: The brake booster servo unit will be damaged if the bleeding operation is performed with the engine off.
2. Remove the master cylinder reservoir cap.
v3. Fill the master cylinder reservoir tank with brake fluid. Keep the reservoir tank at least half full during the air bleeding operation. v4. Always use new brake fluid for replenishment.
5. In replenishing brake fluid, take care that air bubbles do not enter the brake fluid.
Note: When the master cylinder is replaced or overhauled, first bleed the air from the master cylinder, then from each wheel cylinder and caliper following the procedures described below.
MASTER CYLINDER RESERVOIR:
Bleeding the master cylinder
v6. Disconnect the left front brake pipe from the master cylinder.
7. Depress the brake pedal slowly once and hold it.
8. Seal the delivery port of the master cylinder where the pipe was disconnected with your finger, then release the brake pedal slowly.
9. Release your finger from the delivery port when the brake pedal returns completely.
10. Repeat steps 7 to 9 until the brake fluid comes out of the delivery port at step 7.
v 11. Reconnect the brake pipe to the master cylinder and
tighten it.
12. Depress the brake pedal slowly once and hold it.
13. Loosen the left front brake pipe at the master cylinder.
v 14. Retighten the brake pipe, then release the brake
pedal slowly.
15. Repeat steps 12 to 14 until no air comes out from the port when the brake pipe is loosened.
Note: Be very careful not to allow the brake fluid to come in contact with painted surfaces.
16. Bleed the air from the right front brake pipe connection by repeating steps 6 to 15.
Bleeding each wheel cylinder and caliper
v17. Bleed the air from each wheel in the order listed below.
^ Left front caliper
^ Right rear wheel cylinder
^ Right front caliper
^ Left rear wheel cylinder
Note: If the brake fluid does not come out in bleeding each caliper in the order listed above, the master cylinder may contain air in its bore. First bleed the master cylinder as described in steps 6 to 16.
LOOSENING THE BLEEDER SCREW:
DEPRESS THE BRAKE PEDAL:
18. Place the proper size box end wrench over the bleeder screw.
19. Cover the bleeder screw with a transparent tube, and submerge the free end of the transparent tube in a transparent container containing brake fluid.
20. Pump the brake pedal slowly three (3) times (once/sec), then hold it depressed.
21. Remove the air along with oil by loosening the bleeder screw.
v 22. Retighten the bleeder screw.
23. Release the brake pedal slowly.
24. Repeat steps 20 to 23 until the air is removed completely. It is necessary to repeat 10 or more times for front wheels and 15 or more times for rear wheels.
25. Go to the next wheel when one wheel is bled.
v 26. Depress the brake pedal to check if you feel "spongi-
ness" after the air has been removed from all wheel
cylinders and calipers. And if so, the entire bleeding
procedure must be repeated.
REPLENISH UP TO THE MAX LEVEL:
v27. When the bleeding operation has completed on each wheel, check the level of brake fluid in the reservoir vtank and replenish up to the MAX level if necessary.
DIAPHRAGM INSIDE THE CAP:
28. Attach the reservoir cap.
vNote: If the diaphragm inside the cap is deformed, reform it and install as shown in the figure.
29. Stop the engine.