Bronco Full Size L6-300 4.9L (1987)
^ Is fluid level within specifications?
YES -- Go to G3. See: G - Pedal Goes Down Fast/G3 - Pressurize System
NO -- Check reservoir sealing points. Add fluid and perform system brake bleeding procedure. Repeat test G1. See: G - Pedal Goes Down
Fast/G1 - Verify Condition
G3 - Pressurize System
^ Pump brake pedal rapidly (five times).
^ Does pedal height build and hold?
YES -- Check rear brake adjustment and adjust if necessary. If condition still exists, perform system brake bleeding procedure. Repeat test
G1. See: G - Pedal Goes Down Fast/G1 - Verify Condition
NO -- Go to G4. See: G - Pedal Goes Down Fast/G4 - Brake System Leaks
G4 - Brake System Leaks
^ Perform system hydraulic leak test.
^ Does system leak?
NO -- Go to G5. See: G - Pedal Goes Down Fast/G5 - Master Cylinder Bypass Test
YES -- Service as necessary. Add fluid and perform system brake bleeding procedure. Repeat test G1. See: G - Pedal Goes Down Fast/G1 -
Verify Condition
G5 - Master Cylinder Bypass Test
^ Perform master cylinder bypass condition check test N. See: N - Brake Master Cylinder Bypass Condition Check
^ Does master cylinder test OK?
YES -- System OK.
NO -- Replace damaged parts. Add fluid and perform system brake bleeding procedure. Repeat test G1. See: G - Pedal Goes Down Fast/G1
- Verify Condition
H1 - Verify Condition
^ Check if condition occurs during actual stopping application by depressing the brake pedal while the vehicle is moving.
^ Condition occurs only when vehicle is stationary?
YES -- Condition normal.
^ Condition occurs while vehicle is moving and braking performance is affected?
YES -- Go to H2. See: H - Pedal Eases Down Slowly/H2 - Brake System Leaks
H2 - Brake System Leaks
^ Perform hydraulic fluid leak test on entire brake system
^ Does system leak?
NO -- Go to H3. See: H - Pedal Eases Down Slowly/H3 - Master Cylinder Bypass Test
YES -- Service as necessary. Add fluid and perform system brake bleeding procedure. Repeat test H1. See: H - Pedal Eases Down
Slowly/H1 - Verify Condition
H3 - Master Cylinder Bypass Test
^ Perform brake master cylinder bypass condition check, test N. See: N - Brake Master Cylinder Bypass Condition Check
^ Does the master cylinder test OK?
