Three problems related to brake drum wheel cylinder have been reported for the 2012 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Toyota Prius based on all problems reported for the 2012 Prius.
2012 Toyota Prius 5 with 105k miles. Abs, brake, and traction control lights all illuminated while driving to work. Drove to the dealership and had their service department run a diagnosis for 200$. Their scanner reported code c1391, and that a new brake pump and master cylinder assembly would need to be replaced for a total cost of $4,000. Toyota has a customer support program bulletin indicating that certain 2010-2015 Toyota Prius will experience internal malfunctions and require repair for brake booster and brake booster pump assemblies. Since this is a safety issue, Toyota should extend the program indefinite and repair their faulty systems.
The master brake cylinder broke down on my car. The warning lights finally came on however the issue was noticeable before that as the car braking at low speeds created slight stuttering stops when coming to the end of a complete stop plus more importantly, we noticed braking was getting more difficult at certain times. This issue is creating a cost of over $3000 to repair. Numerous others experienced this same issue with the previous Prius model (gen 3) and Toyota acknowledged it and extended the warranty to those models but nothing seemed to been have corrected with the Prius v.
Brake actuator /master brake cylinder broken, same issue as prebious models of the Prius.