Brake Master Cylinder interchangeability

The brake actuator and master cylinder are one item. It is on the left.



Depending on what Toyota parts site you visit or which Toyota doc you are reading it is called a Brake Booster or Master Cylinder Assembly. It has the Skid Ecu inside and software in that ecu changes the part number. Every Prius v is different from any hatchback even in the same year. If the Prius v in 2014 has 17" wheels it has a different Master Cylinder Assembly than a 2014 Prius v with 16" tires. Get the wrong part number and it won't work. To complicate things they all have the same housing number embossed in the case which makes salvage yards think they are all compatible.*

The only sure way to get the proper part number is using the vehicle vin. A Toyota local or online dealer can look it up. Some Toyota online dealers websites can drill down based on model, year and trim. Or you can message them with your vin.

The (Accumulator) Brake Booster Pump or simply Pump Assembly on the right is more generic on gen3 hatchbacks and v's as it has no control built in. However these days it is rarely the problem.

The following captures from an online Toyota dealer represents parts needed for a 2013 v.




* If you wanted to risk installing a used Prius gen3 Master Cylinder you would need the donor car vin to verify its part number.