7
Section 250-0000
SM 1948 4-00
Braking System - Air Braking System Schematic
BRAKING SYSTEM DIAGNOSIS (Continued)
CONDITION REASON REMEDY
Brakes do not apply Defective treadle valve Repair or replace faulty component as
with normal treadle recommended in Section 250-0070, TREADLE
valve application VALVE.
Defective relay emergency valve Repair or replace faulty component as
recommended in Section 250-0280, RELAY
EMERGENCY VALVE.
Brakes apply too Low air pressure in the brake system Trace brake lines by referring to Fig. 1. Install
slowly a test gauge at various points in the system to
determine location of trouble. Test operation
of faulty component as outlined in air brake
control component sections. Repair or replace,
as recommended. Check brake air lines for
leaks.
Treadle valve delivery pressure Check operation of air compressor, air drier
below normal unloader valve and safety valve. Check air lines
for leaks.
Excessive leakage with brakes Trace brake lines by referring to Fig. 1. Install a
applied test gauge at various points in the system to
determine location of trouble. Test operation of
faulty component as outlined in air brake control
component sections. Repair or replace, as
recommended. Check brake air lines for leaks.
Restriction in tubing or hose line Replace tubing or hose lines.
Brakes do not Defective pressure converter Repair or replace faulty component as
release recommended in Section 250-0260, PRESSURE
CONVERTER.
Treadle valve not in fully released Repair or replace faulty component as
position recommended in Section 250-0070, TREADLE
VALVE.
Restriction in tubing or hose line Replace tubing or hose lines.
Brakes grab or pull Faulty operation of one or more Trace brake lines by referring to Fig. 1. Install a
brake air control components test gauge at various points in the system to
determine location of trouble. Test operation of
faulty component as outline in air control
component sections. Repair or replace, as
recommended. Check brake air lines for leaks.
Calliper pistons binding Check calliper operation as described in
Section 165-0010, BRAKE PARTS.
Air pressure too Pressure gauge registering Replace gauge and/or gauge sender unit.
high incorrectly
Faulty air drier, unloader valve Repair of replace faulty component. Refer to
Section 250-0200, AIR DRIER.
Courtesy of Machine.Market
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