A4AF-3, A4BF-2, A4BF-3 1990-07 , W4A32-1, W4A33-1, F4A32-1 (A4AF-1, A4AF-2, A4BF-1) F4A33-1,

When the steel module in one of these units is worn, scored, or warped, no amount of fresh friction material will restore clean engagement until the steel is replaced, and...