Explorer 2WD V6-245 4.0L (1994)
Brake Drum: Testing and Inspection
WARNING: Brake assembly dust and dirt should not be removed by either blowing off with an air gun or vacuuming with a standard
industrial vacuum cleaner because a health hazard from breathing in asbestos dust may develop. Also, any machining done on brake linings or
pads should be done using proper exhaust-ventilated equipment.
INSPECTION
1. Use Rotunda Brake/Clutch/Service Vacuum 091-R0001 or equivalent to remove all dust from backing plates and interior of brake drums (1126).
2. A brake drum should be visually inspected and measured with Rotunda Brake Drum Micrometer 104-00046 or equivalent. Before making an
inspection or measurement, remove grease, brake fluid, or other contaminants from the brake drum using denatured alcohol.
3. Best shop practice requires measuring every brake drum with a brake drum micrometer regardless of visual inspection. The brake drum
micrometer is set to the drum diameter and measures the amount and type of wear. Measure the diameter at various points 45-degrees apart around
the brake shoe and lining contact area, and at the bottom of the deepest groove to determine if the brake drum requires replacement.
