Symptom "D" - Lack of Deceleration During Medium/Hard Brake Applications
- If valve assembly inoperative problem is suspected, check for:
- Leaky dump valve.
- Stuck closed isolation valve.
- If speed sensor input to control module intermittent or improper problem is suspected, check for:
- Short or open circuit in frame or instrument panel harness, control module connector (terminals No. 3 and 10), speed sensor connector, bulkhead connector or other connection, pinched or worn wires, or shorted data link connector.
- Metal chips on speed sensor.
- Borderline high speed sensor-to-sensor ring gap, excessive speed sensor ring radial runout, or damaged or missing speed sensor ring teeth.NOTE: A break in numbering occurs at this point. No steps have been omitted.
- 4)
If basic brake hydraulic problem is suspected, check for:
- Hydraulic leak in brakeline or hose, fitting, master cylinder, wheel cylinder, or caliper.
- Air in brake system.
- 5)
If basic brake mechanical problem is suspected, check for:
- Little or no vacuum boost, stuck or inoperative wheel cylinder or caliper, pinched or crimped brakeline or hose, or ineffective brake shoe or pad linings.