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Aircraft Maintenance Troubleshoot > Cleveland Wheel & Brake Troubleshooting Brake drag1. Piston cocked in cylinder, resulting in overheating brake and/or excessive lining wear.2. Foreign matter wedged in brakes. 3. Back pressure due to malfunction of master cylinder or parking valve. Bleed hydraulic system and/or repair master cylinder or parking valve. 4. Water or ice in hydraulic system. Flush and bleed hydraulic system (thaw ice first). 5. Excessive bolt torque has caused back plate to crush cylinder, evidenced by depressions around bolt holes. Replace cylinder and follow manufacturer's recommended torque value. 6. Piston doesn't retract. Bleed system and/or remove piston. Inspect for damage. 7. Warped pressure plate. Replace pressure plate or flatten to within 0.010 inch. 8. Rigid hydraulic line(s) prevents brake from floating freely. Flexible hydraulic lines are recommended. Check free cylinder movement. Position cylinder and retighten fitting. 9. corroded anchor bolts and/or torque plate bushings. Clean and lubricate or replace. 10. Cocked anchor bolts and/or torque plate bushings. Replace. 11. Bent or cracked torque plate. 12. Warped brake disc can be checked by laying a straightedge across disk face. 13. Out of position or stuck lining.
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