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Code 12 (Loss Of Brake Fluid For One Second During Stop) Aerostar, Explorer, Navajo & Ranger

  1. When this occurs, Red BRAKE warning light will be on. Check brake fluid level. If low, check complete system for leaks, and repair as necessary. Refill master cylinder. If fluid level is okay, go to next step.
  2. Check master cylinder fluid level switch. Remove connector from master cylinder. Connect a jumper wire between the Purple/Yellow wire and Purple/White wire. If Rear ABS and Brake warning lights stay ON, go to step 3). If warning lights stay OFF, replace master cylinder reservoir.
  3. Check for shorts in brake light wiring. Disconnect brake module harness connector from module. Turn ignition switch ON. If Rear ABS light goes OFF and Brake light stays ON, check for short to ground in circuits 977 and 128. See WIRING DIAGRAMS  . If both warning lamps go OFF, replace control module.
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