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42–01 Brake Adjusting—Cam Brakes With Manual Meritor Brakes 1. Adjust Meritor brakes whenever the brake cham- Maximum Allowable Brake Chamber Stroke, with Meritor Cam Brakes Chamber Size Effective Area: square inches Maximum Allowable Stroke * : inches (mm) 12 1-1/2 (38) 16 1-3/4 (44) 20 1-3/4 (44) 24 1-3/4 (44) 24 (long stroke) 2 (51) 30 2 (51) * Adjust the brakes whenever the applied stroke exceeds the maximum. Table 1, Maximum Allowable Brake Chamber Stroke, with Meritor Cam Brakes 1.1 With the brakes released, measure the Ref. A). Record the exact distance as 1.2 Apply the service brakes and hold them , Ref. B). Record the exact distance as measure- 1.3 Subtract measurement A from measure- 2. Compare this value to the maximum allowable . If the applied stroke equals or exceeds the maximum allowable 2.1 Wipe clean the adjusting screw hexhead. . Place a wrench or socket over the adjusting screw hexhead. IMPORTANT: On slack adjusters with an 2.2 Turn the adjusting screw until it is tight, NOTE: Check brake adjustment with the 2.3 To determine if the brake drum is free, IMPORTANT: On slack adjusters with an f420008a B A 08/20/93 1 2 3 A. With the brakes released, measure this distance. Brake Chamber 2. Manual Slack Adjuster (typical) 3. Adjusting Screw Fig. 1, Measuring Brake Adjustment Brakes 42 42/1 |