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CHAPTER IV TROUBLE SHOOTING (cont) - TM-5-4210-230-14P-1_391
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CHAPTER IV TROUBLE SHOOTING (cont) - TM-5-4210-230-14P-1_393
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 PROBLEM POSSIBLE CAUSE REMEDY Spongy   Pedal   (springy   sensation to pedal upon application) Warped brake shoes. Replace shoes. Shoes    not    centered    in    drum    causing partial lining-to-drum contact. Adjust brake shoe anchors. Brake    drums    tapered,    out-of-round    or worn thin. Refinish if practical or replace. Air in system. Bleed    and    refill    system    with    approved hydraulic fluid. Hoses   soft   or   weak   (expanding   under pressure). Replace hoses. Faulty  residual  check  valve(s)  in  master cylinder. Replace valve(s). Wheel cylinder cups soft or swollen. Flush    hydraulic    system    with    alcohol    to remove  contaminated  fluid  and  replace  all cups and seals. Hard Pedal (excessive pedal pressure required to stop vehicle) Shoes worn, distorted or damaged. Replace brake shoes. Inadequate lining to drum clearance. Properly adjust brake shoes. Linings  worn,  glazed,  soiled  (brake  fluid or grease) or of poor quality. Replace linings. Brake lines, hoses or connections kinked, collapsed, dented or clogged. Repair or replace. Master cylinder cups swollen. Flush    hydraulic    system    with    alcohol    to remove  contaminated  fluid  and  replace  all cups and seals. Master cylinder bore rough or corroded. Repair or replace master cylinder. Brake shoe anchors out of adjustment. Adjust anchors. Brake shoe ledges rusted or grooved. Clean and smooth ledges and lubricate. Wheel cylinder cups swollen. Flush    hydraulic    system    with    alcohol    to remove  contaminated  fluid  and  replace  all cups and seals. Wheel cylinder bore rough or corroded. Repair or replace wheel cylinders. Power  cylinder  check  valve  defective  or sticking Replace. Vacuum   lines   to   power   cylinder   loose, broken or collapsed. Tighten or replace. Low vacuum supply to power cylinder. Check for restricted, kinked or leaking line; also engine vacuum. Control  valve,  power  cylinder,  piston  or diaphragm defective. Replace defective part or power cylinder. CTS-2055S  Chapter IV  Page 3 PRINTED IN UNITED STATES OF AMERICA

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