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Some 2004/2005 F-150 vehicles built before 11/29/2004 may exhibit front brake roughness and or shudder while braking. ACTION Service the rack and pinion, rotors, and caliper assemblies as needed, based on vehicle build date and current part levels installed on the vehicle. Refer to the following Service Procedure. SERVICE PROCEDURE 1. Vehicles built prior to 8/20/2003 require the replacement of the rack and pinion assembly if it has not been replaced. Refer to Workshop Manual, Section 206-03 and 211-02. 2. Determine if the vehicle has the old or new level rotors (Figure 1).WHEN REPLACING THE ROTORS ON 4X2 UNITS, A NEW SPINDLE NUT IS REQUIRED. b. If new level (47 fin) rotors are present, perform one (1) of the following: (1) (2) If rotors are within minimum thickness specifications, machine the rotors using the Rotunda on vehicle brake lathe and the Rotunda adapter kit 201-R0093. Refer to the Workshop Manual, Section 206-00 for the correct on-vehicle brake lathe procedure. If rotors are beyond machinable thickness, the front rotors must be replaced. 3. Install new service fix calipers. NOTE REPLACE CALIPERS WITH NEW SERVICE FIX CALIPER ASSEMBLIES BY REMOVING THE CALIPERS AT THE KNUCKLES. THE SERVICE REPLACEMENT CALIPERS WILL BE PRE-ASSEMBLED WITH ANCHOR, SPRINGS, AND PADS. THE CALIPERS SHOULD BE INSTALLED AS A UNIT WITHOUT DISASSEMBLY.
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