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Glazing is noticeable as a shiny surface on the brake linings. You should also check that the adjuster is not frozen, or the cables fraying, thereby stretching when you apply the hand brake. You might have to have the brake drum true-ness measured with a run-out gauge. If the drum is out of round, you aren't going to get good brake shoe contact. The brake drum is out of round if there is a variance of 0.015 mm (0.0006 inch)