Brake Fluid Pump: Testing and Inspection

PUMP MOTOR INSPECTION
1. Turn ignition switch "OFF".
2. Disconnect motor connector.





3. Check motor for resistance. Between motor terminals should be less than 1 ohm at 20°C (68°F), and between terminal and motor body should be 1 Megaohm or more.





4. Connect 12V battery positive terminal to motor connector terminal "1" and negative terminal to "2". Then check if operation sound is heard from motor. If faulty condition was found in Steps 3 or 4, replace hydraulic unit.