Three problems related to brake fluid leak have been reported for the 2010 Toyota Prius. The most recently reported issues are listed below.
My car's abs, traction, and brake lights are on. I took it to two shops and they both said my car was recalled and to have the dealership fix it. The recall is on the breaks. The brake pedal is also not fully working, there is an abnormal leak of brake fluid pressure. Both auto service places said to demand for the dealership to take car of this because there is a class action lawsuit going on for this car with this exact problem.
Was going 25 mph yesterday November 22, 2020 evening when 4 (brake, abs, traction & caution) lights came on dashboard. Pulled over the shoulder & turned ignition off. Restarted later & 4 lights still on. Following day, went to dealership & was told brake booster assembly need to be replaced due to internal fluid leak.
The abs/brake/stability lights are "on" on Prius dash. The brake lost pressure and mushy. The brake must be pumped a few times to get pressure and to stop the car. Either this is abs accumulator(just found out there is a recall while getting dealer appointment) failure or brake master cylinder failure. There is no fluid leak visible outside or indicator light but the fluid is almost empty in the reservoir. I don't have dealer diagnosis at this point yet. I'm not sure if the accident I have on 1/27/2014 that I've rear-ended another vehicle while traveling about 30-35mph and tried to stop but the car did not stop and bumped into the car in front. Fortunately, there is injury or major damages. At that time I didn't think of it that the brake may have issue or not but thinking back the brake didn't have enough bite to stop even though the car is traveling slow enough and there is ample distance. As far as I remember I do not feel the abs kicking in either. Hopefully, I'll find out more from dealer service. Thanks.