Brody
March 20th, 2012, 06:20 AM
From Tricky69:
BLEEDING BRAKE HYDRAULIC SYSTEM
A bleeding operation is necessary to remove air from the hydraulic brake system whenever air is introduced into the hydraulic system. It may be necessary to bleed the hydraulic system at all four brakes if air has been introduced through a low fluid level or by disconnecting brake pipes at the master cylinder. If a brake pipe is disconnected at one wheel, only that wheel cylinder/caliper needs to be bled. If the pipes are disconnected at any fitting located between the master cylinder and brakes, then the brake system served by the disconnected pipe must be bled.
For 4-Wheel Antilock Brake System (ABS) equipped vehicle, be sure to remove the ABS main fuse 40A located at the relay and fuse box before bleeding air. If you attempt to bleed air without removing the main fuse, air cannot be let out thoroughly, and this may cause damage to the hydraulic unit. After bleeding air, be sure to replace the ABS main fuse back to its original position.
Set the parking brake completely, then start the engine. NOTE: The vacuum booster will be damaged if the bleeding operation is performed with the engine off.
Remove the master cylinder reservoir cap.
Fill the master cylinder reservoir with brake fluid. Keep the reservoir at least half full during the air bleeding operation
Always use new brake fluid for replenishment.
In replenishing brake fluid, take care that air bubbles do not enter the brake fluid. 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.
Bleeding The Master Cylinder
Disconnect the rear wheel brake pipe (1) from the master cylinder. Check the fluid level and replenish as necessary. If replenished, leave the system for at least one minute.
Depress the brake pedal slowly once and hold it depressed.
Completely seal the delivery port of the master cylinder with your finger, where the pipe was disconnected then release the brake pedal slowly.
Release your finger from the delivery port when the brake pedal returns completely.
Repeat steps 7 through 9 until the brake fluid comes out of the delivery port during step 7. NOTE: Do not allow the fluid level in the reservoir to go below the half-way mark.
Reconnect the brake pipe (1) to the master cylinder and tighten the pipe.
Depress the brake pedal slowly once and hold it depressed.
Loosen the rear wheel brake pipe (1) at the master cylinder.
Retighten the brake pipe, then release the brake pedal slowly.
Repeat steps 13 through 15 until no air comes out of 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.
Bleed the air from the front wheel brake pipe connection (2) by repeating steps 7 through 16.
Bleeding The Caliper
Bleed the air from each wheel in the order listed below:
Right rear caliper
Left rear caliper
Right front caliper
Left front caliper Conduct air bleeding from the wheels in the above order. If no brake fluid comes out, it suggests that air is mixed in the master cylinder. In this case, bleed air from the master cylinder in accordance with steps 7 through 17, and then bleed air from the caliper.
Place the proper size box end wrench over the bleeder screw.
Cover the bleeder screw with a transparent tube, and submerge the free end of the transparent tube in a transparent container containing brake fluid.
Pump the brake pedal slowly three (3) times (once/sec), then hold it depressed.
Loosen the bleeder screw until fluid flows through the tube.
Retighten the bleeder screw.
Release the brake pedal slowly.
Repeat steps 21 through 24 until the air is completely removed. It may be necessary to repeat the bleeding procedure 10 or more times for front wheels and 15 or more times for rear wheels.
Go to the next wheel in the sequence after each wheel is bled. Be sure to monitor reservoir fluid level.
Depress the brake pedal to check if you feel "sponginess" after the air has been removed from all wheel cylinders and calipers. If the pedal feels "spongy", the entire bleeding procedure must be repeated.
After the bleeding operation is completed on the each individual wheel, check the level of the brake fluid in the reservoir and replenish up to the "MAX" level as necessary.
Attach the reservoir cap. If the diaphragm inside the cap is deformed, reform it and install.
Stop the engine.
BLEEDING BRAKE HYDRAULIC SYSTEM
A bleeding operation is necessary to remove air from the hydraulic brake system whenever air is introduced into the hydraulic system. It may be necessary to bleed the hydraulic system at all four brakes if air has been introduced through a low fluid level or by disconnecting brake pipes at the master cylinder. If a brake pipe is disconnected at one wheel, only that wheel cylinder/caliper needs to be bled. If the pipes are disconnected at any fitting located between the master cylinder and brakes, then the brake system served by the disconnected pipe must be bled.
For 4-Wheel Antilock Brake System (ABS) equipped vehicle, be sure to remove the ABS main fuse 40A located at the relay and fuse box before bleeding air. If you attempt to bleed air without removing the main fuse, air cannot be let out thoroughly, and this may cause damage to the hydraulic unit. After bleeding air, be sure to replace the ABS main fuse back to its original position.
Set the parking brake completely, then start the engine. NOTE: The vacuum booster will be damaged if the bleeding operation is performed with the engine off.
Remove the master cylinder reservoir cap.
Fill the master cylinder reservoir with brake fluid. Keep the reservoir at least half full during the air bleeding operation
Always use new brake fluid for replenishment.
In replenishing brake fluid, take care that air bubbles do not enter the brake fluid. 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.
Bleeding The Master Cylinder
Disconnect the rear wheel brake pipe (1) from the master cylinder. Check the fluid level and replenish as necessary. If replenished, leave the system for at least one minute.
Depress the brake pedal slowly once and hold it depressed.
Completely seal the delivery port of the master cylinder with your finger, where the pipe was disconnected then release the brake pedal slowly.
Release your finger from the delivery port when the brake pedal returns completely.
Repeat steps 7 through 9 until the brake fluid comes out of the delivery port during step 7. NOTE: Do not allow the fluid level in the reservoir to go below the half-way mark.
Reconnect the brake pipe (1) to the master cylinder and tighten the pipe.
Depress the brake pedal slowly once and hold it depressed.
Loosen the rear wheel brake pipe (1) at the master cylinder.
Retighten the brake pipe, then release the brake pedal slowly.
Repeat steps 13 through 15 until no air comes out of 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.
Bleed the air from the front wheel brake pipe connection (2) by repeating steps 7 through 16.
Bleeding The Caliper
Bleed the air from each wheel in the order listed below:
Right rear caliper
Left rear caliper
Right front caliper
Left front caliper Conduct air bleeding from the wheels in the above order. If no brake fluid comes out, it suggests that air is mixed in the master cylinder. In this case, bleed air from the master cylinder in accordance with steps 7 through 17, and then bleed air from the caliper.
Place the proper size box end wrench over the bleeder screw.
Cover the bleeder screw with a transparent tube, and submerge the free end of the transparent tube in a transparent container containing brake fluid.
Pump the brake pedal slowly three (3) times (once/sec), then hold it depressed.
Loosen the bleeder screw until fluid flows through the tube.
Retighten the bleeder screw.
Release the brake pedal slowly.
Repeat steps 21 through 24 until the air is completely removed. It may be necessary to repeat the bleeding procedure 10 or more times for front wheels and 15 or more times for rear wheels.
Go to the next wheel in the sequence after each wheel is bled. Be sure to monitor reservoir fluid level.
Depress the brake pedal to check if you feel "sponginess" after the air has been removed from all wheel cylinders and calipers. If the pedal feels "spongy", the entire bleeding procedure must be repeated.
After the bleeding operation is completed on the each individual wheel, check the level of the brake fluid in the reservoir and replenish up to the "MAX" level as necessary.
Attach the reservoir cap. If the diaphragm inside the cap is deformed, reform it and install.
Stop the engine.