Ford 2003 Mustang Workshop Manual page 530

7. Bleed each brake tube at the brake master cylinder as follows:
1. Have an assistant pump the brake pedal, and then hold firm pressure on the brake pedal.
2. Loosen the rear most brake tube fittings until a stream of brake fluid comes out. While
the assistant maintains pressure on the brake pedal, tighten the brake tube fitting.
3. Repeat this operation until clear, bubble-free fluid comes out.
4. Refill the brake master cylinder reservoir as necessary. Repeat the bleeding operation at
the front brake tube.
Master Cylinder Priming — 4.6L
1. CAUTION: Use only bleed screws on the engine side of the brake master cylinder
(2140). The hydro-boost bleed screw, located near the dash on the hydro-booster
casting, is for the booster cavity filled with power steering fluid, not brake fluid.
Connect a clear waste line to the bleed screw closet to the booster first and the other end in a
container partially filled with recommended brake fluid.
2. Open the bleeder screw, have an assistant push the brake pedal down slowly through full travel,
close the bleeder screw, then return brake pedal slowly to full released position. Wait five
seconds, then repeat operation until air bubbles cease to appear.
3. Repeat Step 2 for bleeder screw farthest from hydro-booster.