Brake actuator ABS pressure loss
SERVICE BRAKES
59 NHTSA complaints · 2014-12 → 2026-06
“I own 2 2009 Toyota Prius. Both cars less than 175,000 miles and both have failed ABS modules. The ABS module in this vehicle is also the power brake booster. This failure can cause braking issues such as loss of braking or sudden brake application”
“BRAKE PRESSURE LOSS AND CONSTANT NOISE FROM THE BRAKE ACTUATOR, READ CODES C1256 AND C1391”
“ZG1 KNOWN ISSUE WITH BRAKE ACTUATOR ASSEMBLY. WARRANTY ENHANCEMENT PROGRAM ZG1 WAS ISSUED TO COVER 2ND GEN PRIUS' FOR 10 YEARS. AT 10 YEAR 3 MONTHS AND 143K MILES HAD UNIT FAIL, LEAVING DRIVING WITH ONLY FUNCTIONING REAR BRAKES”