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TSB Main Page
TSB
99-13-13
  • ANTI-LOCK BRAKE SYSTEM (ABS) - ABS LAMP ILLUMINATED - 4X2 ONLY
  • ANTI-LOCK BRAKE SYSTEM (ABS) - FALSE ABS CYCLING AT LOW SPEEDS - 4X2 ONLY
  • ANTI-LOCK BRAKE SYSTEM (ABS) - INCREASED BRAKE PEDAL EFFORT AT LOW SPEEDS - 4X2 ONLY
  • LAMP - ANTI-LOCK BRAKE LAMP ILLUMINATION - INCREASED BRAKE PEDAL EFFORT AND/OR FALSE ABS CYCLING AT LOW SPEEDS - 4X2 ONLY
Publication Date: JUNE 21, 1999

FORD:
1997-1999 EXPEDITION, F-150, F-250 LD
LINCOLN:
1998-1999 NAVIGATOR

This TSB article is being republished in its entirety to state coverage for 4X2 vehicles only and revise Figure 1 .

ISSUE:

Increased brake pedal effort and/or false Anti-lock Braking System (ABS) cycling at low speeds, or ABS lamp illumination may occur on some vehicles. This may be caused by an incorrectly installed front wheel speed sensor, low vacuum in the brake booster, or a chipped or broken tooth on the tone ring resulting in reduced output to the ABS Electronic Control Unit (ECU).

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