I have a 2007 Prius, 123K miles. I get codes C1256 and C1391, showing that the brake actuator needs to be replaced. I have been told that I may also need another part replaced. But all the posts I've seen on priuschat only refer to replacing the actuator assembly. Is there another part that needs to be replace, perhaps the booster?
You have probably had some search results for gen 3 or other generations mixed in with your gen 2 results. Other generations have their brake parts divvied up differently. Replacement of the actuator assembly is likely all you need on a gen 2. "The booster" is the last thing you'd ever need to replace on a gen 2, given that gen 2 is the sole Prius generation not to have one.* Gen 2 still does have a "booster pump", which is a funny choice of name in a car that has no booster. But the gen 2 booster pump is part of the actuator assembly, so changing the actuator takes care of it. * that I know of ... I haven't studied that for gen 5 ....
Thanks for this information. I was told by a dealer (both the parts person and the service rep) that a second part was needed. I looked into this further with the dealer, and the part number is 47200-47020 and it's called the "brake master cylinder assembly." I think someone had referred to the second required part as the "brake booster pump," but I searched parts a the toyota website and it seems like the 2nd Gen Prius doesn't have a booster pump, which is what you said. Another thing I'm not clear about: The dealer told me the part number for the actuator assembly I need is 44500-47141. When I search on ebay and amazon for this part number, many of the parts had that number and 44510-47050. Also, at the toyota website, the part number for my Prius (using my VIN) is also 44500-47141; but the part number of the actuator assembly in the photo of the part is 44510-47051! Can anyone clarify this?
It's not quite what I said. In (most) Prius brake systems, there is a part called the booster, and a part called the booster pump. Gen 2 was the exception. Gen 2 does not have a booster. It does, however, have a pump, which is still called the booster pump, even though there isn't a booster. However, the gen 2 booster pump is not something you have any need to worry about separately, because it is included in the gen 2 actuator. Gen 2 does have a separate master cylinder, which is what that is, and it is extremely simple, more like a master cylinder in a car from the 1960s. It is not commonly reported to have any problem demanding replacement. This is a confusion that people constantly run into. A Toyota part can have a number printed or stamped on it that is nnnnn-nnnnn format just like a part number, but is not the part number for that part. It may be something called an "engineering number". It may be the (unpublished) part number of some constituent piece of that part, that still is visible on the outside when assembled. It may be any number of things. It just isn't the part number, that's all. So you do get situations where you look up a part on a Toyota site by its (correct) part number, and you look at a photo, and you see some other number showing. Amazon and eBay sales of used or reman parts suffer even worse, because of course the sellers pick up the part and see the number on it and think "oh, that must be the part number" and put it into their listing as the part number, because they don't know any better and haven't got the time to look it up.
