CUSTOMER CONCERN Customer states the ABS and brake warning lights are on and the ABS pump runs repeatedly. DTC C1391 is stored. CAUSE No external brake-fluid leak was found, and accumulator pressure dropped after pump shutdown, confirming internal leakage in the ABS brake actuator. CORRECTION Remove and replace ABS brake actuator assembly. Perform actuator initialization and complete brake-system bleed, clear DTC C1391 and verify accumulator pressure holds.

CUSTOMER CONCERN Customer states the ABS, brake and traction-control warning lights are on. DTCs C1241, C1256 and C1391 are stored. CAUSE Accumulator-pressure voltage dropped after the pump shut off, confirming internal leakage in the ABS brake actuator assembly. CORRECTION Remove and replace ABS brake actuator assembly. Perform actuator initialization and brake-system bleed. Clear brake DTCs.

CUSTOMER CONCERN Customer states the ABS and brake warning lights are on and the ABS pump runs repeatedly. DTC C1391 is stored. CAUSE No external brake-fluid leak was found, and accumulator pressure dropped after pump shutdown, confirming internal brake-actuator leakage. CORRECTION Remove and replace ABS brake actuator assembly. Perform actuator initialization and brake-system bleed. Clear DTC C1391.

CUSTOMER CONCERN Customer states the ABS and brake warning lights are on and the ABS pump runs repeatedly. DTC C1391 is stored. CAUSE No external brake-fluid leak was found, and accumulator pressure dropped after pump shutdown, confirming internal leakage in the ABS brake actuator. CORRECTION Remove and replace ABS brake actuator assembly. Perform required actuator initialization and brake-system bleed. Clear DTC C1391.

CUSTOMER CONCERN The ABS, BRAKE and TRAC warning lights were on with DTCs C1241, C1256 and C1391. CAUSE Accumulator-pressure data confirmed an internal brake actuator fault. CORRECTION The ABS brake actuator assembly was replaced.