Parts for your 2020 Toyota Prius-Brake wheel cylinders

2020 Toyota Prius brake wheel cylinders

Based on Toyota technical literature and parts data, brake wheel cylinders are fitted to most 2020 Toyota Prius models that use rear drum brakes. References include the Toyota New Car Features (ZVW50 series) outlining the rear drum brake design, the Toyota Repair Manual for 2016–2021 Prius which contains specific procedures for “Rear Drum Brake – Wheel Cylinder”, and Toyota’s Electronic Parts Catalogue which lists a “Cylinder Assy, Rear Wheel Brake” for ZVW50-series Prius. Toyota Australia/NZ model specifications for this era commonly note rear drum brakes, which means wheel cylinders are relevant to those vehicles. Some overseas trims with rear disc brakes won’t have wheel cylinders, if a specific 2020 Prius has rear discs, this component does not apply.

On a 2020 Prius with drum rears, the wheel cylinders are the small hydraulic actuators inside each rear drum that turn brake fluid pressure into movement, pushing the shoes against the drum to slow the car. They’re simple, dependable, and light — perfect for the Prius’ efficiency brief.

As part of regular servicing, it’s smart to have the rear brakes inspected for seepage around the wheel cylinder dust boots, damp linings, uneven shoe wear, or a soft/low pedal. Any sign of fluid at the bottom of the backing plate usually points to a leaking wheel cylinder. If one side leaks or seizes, both rear cylinders should be replaced together to keep braking even. Always use fresh, quality DOT 3 brake fluid that meets Toyota specs.

Because the Prius uses an electronically controlled brake system (ECB), bleeding after wheel cylinder replacement must follow the Toyota procedure using a suitable scan tool (e.g., Techstream) to actuate the brake actuator and valves. Old-school “pump the pedal” bleeding can trap air or damage components on ECB systems. After cylinder replacement, the technician should:

• Perform ECB/ABS bleeding with the correct scan routine and refill with new fluid.
• Set shoe-to-drum clearance correctly and verify the parking brake adjustment.
• Road test, bed-in the rear shoes, and recheck for leaks and pedal feel.

Under typical Australian and New Zealand servicing, the rear brakes are inspected at each service and brake fluid is replaced about every 24 months. Genuine or reputable aftermarket cylinders and new copper washers/seals help ensure a long, squeak-free life. If the vehicle has rear disc brakes, wheel cylinders aren’t present, the service focus then shifts to callipers, pads and rotors.

Popular questions

Does the 2020 Prius have rear drum brakes and wheel cylinders?
Most Australian and New Zealand 2020 Prius models use rear drum brakes, so they do have wheel cylinders. Some trims in other markets run rear disc brakes instead, those won’t have wheel cylinders. A quick look at the rear brake hardware or the vehicle’s spec sheet will confirm which setup is fitted.

How often should wheel cylinders be serviced or replaced?
They’re inspected at every service for leaks, dust boot damage and smooth operation. There’s no fixed kilometre replacement interval — they’re changed when leaking, seized or contaminated. Brake fluid is typically replaced about every two years, which also helps keep wheel cylinders healthy.

Can a DIYer replace Prius wheel cylinders at home?
Physically swapping the cylinders is straightforward, but bleeding the Prius’ electronically controlled brakes needs a scan tool and the Toyota bleed routine. Without that, air can remain in the system. For most owners, it’s best handled by a workshop familiar with Toyota ECB systems.