D - Brake Pedal Goes Down Fast

D1 CHECK PEDAL FEEL
Road Test vehicle and apply brake pedal. Was brake pedal effort normal?
YES - Vehicle OK.
NO - Go to D2

D2 CHECK BRAKE FLUID LEVEL
Check Brake Master Cylinder reservoir fluid level. Is fluid level acceptable?
YES - Go to D3
NO - Check Brake Master Cylinder reservoir sealing points. Refer To Master Cylinder, Brakes - System Diagnosis.Non-Pressure Leaks Add fluid and bleed system. Repeat D1.

D3 PRESSURIZE SYSTEM
Pump brake pedal rapidly five times. Does the brake pedal height build up and then hold?
YES - Check rear brake adjustment and adjust if necessary. If condition still exists, bleed air from the system. Repeat D1.
NO - Go to D4.

D4 CHECK FOR BRAKE SYSTEM LEAKS
Check for external brake system leaks. Refer To Hydraulic System - System Diagnosis. Testing and InspectionAre any found?
YES - Service as necessary, add fluid and bleed system. Repeat D1
NO - Go to D5

D5 PERFORM MASTER CYLINDER BYPASS CONDITION CHECK
Test Brake Master Cylinder Bypass Condition. Was a concern found?
YES - Replace Brake Master Cylinder.Master Cylinder, Brakes Add fluid and bleed system. Repeat D1.
NO - System OK.