Yukon Denali 2WD V8-6.0L Hybrid (2010)
73. If internal leaks are found, replace the master cylinder. Refer to Master Cylinder Replacement (JD9) (See: Hydraulic System/Brake Master
Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement (JD9))Master Cylinder Replacement (JH6) (See:
Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement (JH6))Master Cylinder
Replacement (Two-mode Hybrid) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master
Cylinder Replacement (Two-Mode Hybrid)).
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) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder
Replacement (JD9))Master Cylinder Replacement (JH6) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and
Replacement/Master Cylinder Replacement (JH6))Master Cylinder Replacement (Two-mode Hybrid) (See: Hydraulic System/Brake Master
Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement (Two-Mode Hybrid)).
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: 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.
