Econoline E550 V10-6.8L VIN S (2003)
6. Remove the secondary piston assembly.
1. Plug the rear outlet port and, if necessary, plug the brake pressure switch port.
2. Apply compressed air into the front outlet port and remove the secondary piston assembly and discard.
7. NOTE: If the brake master cylinder bore is damaged, a new brake master cylinder must be installed.
Clean the brake master cylinder bore using isopropyl alcohol and inspect for damage.
Assembly
1. Use clean brake fluid to lubricate the new piston assembly seals.
2. Carefully install the secondary piston assembly.
3. Carefully install the primary piston assembly.
