Can an actuator go bad after sitting in a junked/salvaged Prius?

I'm really hesitant to put a used brake actuator in another Prius that needs it since it might not work. I know that the brake actuator worked well when the car was wrecked however after many years wondering if its even worth putting that actuator in another Prius.

Do they wear down on any kind of timeline? 350K vs 250K or is it all based on use?

Reading some information that the actuator-issue was fixed for 2008-2009. I think I am pulling from a 2008 and putting in 2007, would that be relevant or are all years for Gen 2 the same?

Would also appreciate any seller-links that sell good, working brake actuators if you know of any.

Thanks.

 

asked AI:

Yes, a Gen 2 brake actuator (common in Toyota Prius 2004–2009 models) can develop leaks or fail from prolonged sitting/non-use, though it's more often tied to age, mileage, and normal wear.

Why This HappensGen 2 Prius brake actuators (part of the ABS/hybrid brake system with an accumulator/pump) are known for internal leaks over time. The main issues include:

• Internal seals and O-rings drying out, shrinking, or hardening when the system isn't cycled regularly. This is a common problem with rubber components left unused.
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• Brake fluid degradation: Brake fluid is hygroscopic (absorbs moisture from the air). When a vehicle sits, it can draw in moisture, leading to corrosion, reduced lubricity, and accelerated seal wear. Old/contaminated fluid worsens internal leaks.
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• Lack of pressure cycling: The actuator's accumulator holds pressure. Without regular use (braking, driving), minor issues can worsen as seals aren't exercised, and pressure drops faster.