AIR BRAKES - GENERAL INFORMATION DIAGNOSIS GUIDES CONDITION POSSIBLE CAUSE RESOLUTION Insufficient Brakes Brakes need adjusting or relining Adjust, replace or reline as Drum or rotor wear necessary Low air pressure in brake system Check governor function Brake valve delivery pressure low Check brake valveRepair or replace as necessary Excessive condensation in Drain reservoirs reservoir Failure of part of a split air system Repair or replace as necessary Brakes Apply Too Slowly Brakes need adjusting or Adjust or lubricate as necessary lubricating Low air pressure in brake system Check governor functionAdjust or repair as necessary Insufficient brake valve delivery Check brake valveRepair or pressure replace as necessary Excessive leakage with brakes Check all connections, chamber applied diaphragms and hosesRepair or replace as necessary Restricted tubing or hose Repair or replace as necessary Treadle travel restricted Repair or lubricate as necessary Brakes Release Too Slowly Brakes need adjusting or Adjust or lubricate as necessary lubricating Brake valve not returning to fully Clean, inspect and lubricate as released position necessary Restricted tubing or hose Repair or replace as necessary Exhaust port of components Repair or replace as necessary restricted or plugged* Faulty components* Repair or replace as necessary Brake Valve, Quick Release Valve, Relay Valve Brakes Do Not Apply No air pressure in brake system Check air compressor, governor, supply and delivery systems Restricted or broken compressor Repair or replace as necessary discharge line tubing or hose Faulty brake valve Repair or replace as necessary Brakes Do Not Release Sticking shoe guide pins Repair or replace as necessary Sticking anchor pins Repair or replace as necessary Broken or weak return springs Repair or replace as necessary Brake valve not fully released Check brake valveRepair or replace as necessary Parking brake chamber leaking Replace diaphragm Faulty brake valve or relay valve Repair or replace as necessary Restricted or collapsed tubing or Repair or replace as necessary hose CTS-4154Y - Page 23