Silverado 1500 4WD V8-6.0L Hybrid (2009)
Brakes and Traction Control/Hydraulic System/Testing and Inspection/Component Tests and General Diagnostics/Brake System Internal Leak
Test) andBrake Pedal Travel Measurement and Inspection (Non-Hybrid) (See: Brakes and Traction Control/Hydraulic System/Testing and
Inspection/Component Tests and General Diagnostics/Brake Pedal Travel Measurement and Inspection)Brake Pedal Travel Measurement and
Inspection (Two-mode Hybrid) (See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Component Tests and General
Diagnostics/Brake Pedal Travel Measurement and Inspection) .
73. If internal leaks are found, replace the master cylinder. Refer to Master Cylinder Replacement (JD9, JF3, JF7) (See: Brakes and Traction
Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Overhaul)Master Cylinder
Replacement (Two-Mode Hybrid) (See: Brakes and Traction Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and
Replacement/Master Cylinder Replacement)Master Cylinder Replacement (JH6, JH7) (See: Brakes and Traction Control/Hydraulic
System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement) .
74. If the brake pedal travel exceeds specification and there is no damage to the pedal system or pushrod, replace the master cylinder. Refer to Master
Cylinder Replacement (JD9, JF3, JF7) (See: Brakes and Traction Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal
and Replacement/Master Cylinder Overhaul)Master Cylinder Replacement (Two-Mode Hybrid) (See: Brakes and Traction Control/Hydraulic
System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement)Master Cylinder Replacement (JH6,
JH7) (See: Brakes and Traction Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master
Cylinder Replacement) .
75. Turn the ignition switch to ON, without starting the engine.
Observe if the brake system warning lamp remains illuminated.
76. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until the brake system is diagnosed and repaired.
Refer to Symptoms - Hydraulic Brakes (See: Brakes and Traction Control/Hydraulic System/Testing and Inspection/Symptom Related
Diagnostic Procedures/Symptoms - Hydraulic Brakes) .
77. Start the engine.
78. Firmly apply the brake pedal several times.
Observe the brake pedal feel.
79. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
80. Drive the vehicle to a speed above 13 km/h (8 mph) to allow ABS initialization to occur.
Observe the brake pedal feel.
81. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
