See Figures 1, 2 and 3
The brakes should be bled whenever a brake line, caliper, wheel cylinder, or master cylinder has been removed or when the brake pedal is low or soft.
If using a pressure bleeder, follow the instructions furnished with the unit and choose the correct adapter for the application. Do not substitute an adapter that "almost fits" as it will not work and could be dangerous.
- Fill the master cylinder with fresh brake fluid. Check the level often during the procedure.
- Starting with the right rear wheel, remove the protective cap from the bleeder, if equipped, and place where it will not be lost. Clean the bleed screw.
- If the system is empty, the most efficient way to get fluid down to the wheel is to loosen the bleeder about 1 / 2 - 3 / 4 turn, place a finger firmly over the bleeder and have a helper pump the brakes slowly until fluid comes out the bleeder. Once fluid is at the bleeder, close it before the pedal is released inside the vehicle.
If the pedal is pumped rapidly, the fluid will churn and create small air bubbles, which are almost impossible to remove from the system. These air bubbles will eventually congregate and a spongy pedal will result.
- Once fluid has been pumped to the caliper or wheel cylinder, open the bleed screw again, have an assistant press the brake pedal to the floor, lock the bleeder and have an assistant slowly release the pedal. Wait 15 seconds and repeat the procedure, including the 15 second wait, until no more air comes out of the bleeder upon application of the brake pedal. Remember to close the bleeder before the pedal is released inside the vehicle each time the bleeder is opened. If not, air will be induced into the system.
- If a helper is not available, connect a small hose to the bleeder, place the end in a container of brake fluid and proceed to pump the pedal from inside the vehicle until no more air comes out the bleeder. The hose will prevent air from entering the system.
Repeat the procedure on remaining wheel cylinders in order:
- Left front caliper
- Left rear wheel cylinder or caliper
- Right front caliper
- Hydraulic brake systems must be totally flushed, if the fluid becomes contaminated with water, dirt or other corrosive chemicals. To flush, bleed the entire system until all fluid has been replaced with the correct type of new fluid.
- Install the bleeder cap(s) on the bleeder to keep dirt out. Always road test the vehicle.