How should removed brake linings be inspected for deformation?

The appropriate method for inspecting removed brake linings for deformation involves laying a straightedge across the linings and checking for gaps. This technique allows for a precise assessment of the surface of the brake linings. When the straightedge is placed against the lining, any gaps that appear indicate that the surface may no longer be flat or true, which can compromise the effectiveness of braking. Flat brake linings are crucial for proper contact with the brake drum or rotor, ensuring maximum friction and reliable performance.

Using a ruler to measure thickness focuses solely on one aspect of the brake lining but doesn't account for warping or irregularities in the surface. Weighing them on a scale might provide some information about material loss but wouldn't indicate deformation caused by heat or uneven wear. Visual inspections for cracks can alert you to structural issues but do not provide a complete picture of the linings’ flatness or overall condition. Therefore, examining the surface with a straightedge is the most effective way to detect any deformation in brake linings.