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9 Brake Pedal Travel Measurement and Go to Step 11 Go to Step 10 10 1. Inspect for worn, missing, misaligned, bent or damaged brake pedal system For the brake pedal pushrod Inspect the brake pedal bushings for 2. Replace the brake pedal system components that are worn, missing, Did you find and replace any worn, missing, Go to Step 12 Inspect for 11 1. Check the power steering system fluid level and adjust the level if necessary. 2. Inspect the power steering pump drive belt for proper tension and excessive 3. Inspect the power steering pressure and return hoses for proper routing, possible 4. Inspect the hydraulic brake booster for leaks. Refer to Power Brake Booster -
2008 Chevrolet Silverado 1500 2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Leak Inspection. Did you complete the inspections and any Go to Step 12 12 Perform the hydraulic booster functional test: 1. With the ignition OFF, depress the brake pedal several times to deplete the power 2. Depress and maintain 178 N (40 lb) of force on the brake pedal. 3. Start the engine and observe pedal operation. IMPORTANT: The brake pedal should fall slightly, then hold. Go to Step 16 Go to Step 13 13 Perform the Power Steering System Test Go to Step 14 Go to Step 19 14 Perform the hydraulic booster functional test: 1. With the ignition OFF, depress the brake pedal several times to deplete the power 2. Depress and maintain 178 N (40 lb) of force on the brake pedal. 3. Start the engine and observe pedal operation.
IMPORTANT: The brake pedal should fall slightly, then hold.
2008 Chevrolet Silverado 1500 2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Did the brake pedal fall slightly after the Go to Step 16 Go to Step 19 15 Perform the Power Steering System Test Go to Step 14 Go to Step 19 16 Perform the short-term or accumulator reserve 1. Start the engine and allow it to idle. 2. Charge the accumulator: Turn the steering wheel to full-lock 3. Turn the ignition OFF. 4. Wait 90 seconds. 5. Depress the brake pedal 2 times to check power reserve. Observe pedal effort. IMPORTANT: Both pedal applies should be assisted The amount of assist could diminish If 2 power assisted pedal applications Go to Step 17 Go to Step 18 Perform the long-term reserve leak-down test: 1. Start the engine and allow it to idle. 2. Charge the accumulator: Turn the steering wheel to full-lock
2008 Chevrolet Silverado 1500 2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
BRAKE SYSTEM VEHICLE ROAD TEST Preliminary Inspections 1. Visually inspect easily accessible brake system components for obvious damage and/or leaks which may indicate that the vehicle should not be driven until further inspections have been 17 to rest. 3. Turn the ignition OFF. 4. Wait 1 hour. 5. Depress the brake pedal 2 times to check power reserve. Observe pedal effort. IMPORTANT: Both pedal applies should be assisted The amount of assist could diminish If 2 power assisted pedal applications Go to Step 20 Go to Step 19 18 Replace the hydraulic brake booster Go to Step 20 - 19 Replace the hydraulic brake booster assembly. Go to Step 20 - 20 Install or connect any components that were Brake Assist System OK Return to Symptom Table -
2008 Chevrolet Silverado 1500 2008 BRAKES Hydraulic Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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