Confirm P/N's for "2013" PIP 'Brake Actuator Assy' & 'Booster Pump/Accumulator'?

As @ChapmanF has noted in several threads on replacing one or both of the 'Brake Actuator Assy' (upper unit) & 'Booster Pump/Accumulator' (lower) units, the names used by online sites for Toyota Dealers and eBay vary confusingly, so you have to go by the part number, and it's picture to know which unit is which. I'd like to confirm the correct P/N's for each and ask a few other related questions.

'Actuator Assy, Brake w/Fluid' (aka Brake Master Cylinder Assy w/Fluid) This is the upper unit that attaches through the firewall to the brake pedal (see picture at end of post):
My local Toyota dealer here in the SF Bay Area told me that for my "2013 Plug-In" there were two different possible part numbers, 47050-47210 –or– 47050-47340. He said, they have to pull the one in my Prius to see the PN of the one in my car, to determine which my car has, then order it. They both have the identical part diagram, so I assume are identical physically from the outside. Researching further, I read there was a software change, so it depends on the build date, if you have the older 210 or the newer 340 version in your car. Using dealer site's vehicle selection of Year-2013 > Brand-Toyota > Model- Prius Plug In > Full PHEV (-or- Electr./Gas...weird that this is listed as an option for a "Plug In"!) the dealer site's links to the PN's above shows the older 47210 fits 2012 to 2015 and the newer 47340 fits 2014 through 2015. I guess parts guy was being extra careful with a 2013??

'Brake Booster Pump Assembly w/ Accumulator' This is the lower unit with the two 'can looking' cylinders (see picture at end of post).
All my searching/ research says that Pump Assembly, Brake Booster (PN 47070-47060 )

2010-2018 Toyota, is the correct part for my 2013 Plug In, an in fact spans many years and models. Though the part description shows 2010-2018, down below in the Vehicle Fitment list for Prius Plug In, it only shows 2015 Year. Spec manuals, and even more so websites can have errors. I expect that is what this is, but it still would be good to confirm with those here that know from either buying the part for your DIY install or from your dealer's installation invoice.

When I was last I was researching the fix for my brake symptoms a few months ago (continuous/ repeating 10 second brake pump running sound, all the associated dash lights, and the notorious C1391 code), the opinions seemed unanimous, that you should replace both units, because you could not know which unit was at fault. The car has been parked, not driven.

Soon, I expect to have the time to do this DIY repair, so I was searching PriusChat again on the topic to refresh my memory and of course my parts search query as noted above. I ran across some discussions where @ChapmanF posited here (post #16) that it may just be that the Actuator Assy is bad, based on a sound recording submitted... "If your sounds really are exactly like in that video, that pump sounded pretty good really. It's the valves in the actuator that are probably shot."

This rang a bell for me. I had always thought that the PUMP sounded very strong, so didn't seem like it would be the issue. Of course, the pump 'running' strong every 10 seconds does not mean that the other parts of the system in the lower Booster Pump/ Actuator were not a problem. ie, 1) Pump great, but an internal pressure leak here causing pump to run every 10 seconds, 2) Pump running fine but not pushing anywhere near the psi spec needed, Other parts may or may not have a pressure leak.

But the idea of the "valves in the upper Actuator Assy may be shot", seems like a decent possibility, since that unit has the constant brake pedal movement over 200k miles of use. ChapmanF's thoughts here make me lean more strongly to risk just replacing the upper Actuator Assy. The risk being that if it does not fix the issue(s), I get to go back in, pull the Actuator Assy (easier the second time ;o), and pull and replace the lower Brake Booster/ Accumulator assy.

Anyway, that's the end of my always wordy parts questions and thoughts on my repair. I could not discern any different sounds at the end of the video that ChapmanF did, that sounded like the pump kicking in that sounded strong to him (Prius Sound while braking Video here). But my hearing is not to par. If there is any chance that my posting a sound recording of my 2013 Plug In's 10-second repeating pump sound, I will certainly do that, if requested.

Here is a helpful image of both units provided by ChapmanF from the other thread. How they are shown here matches their upper, lower orientation as mounted in the car. The upper unit is the "Actuator Assy", the lower, as noted, is the Booster Pump/ Accumulator Assy.
Edit 2/27/25 2:20pm: I corrected the description of the upper unit in the actual attached image to eliminate confusion.

 

I had just copied over the image you had posted leaving the incorrect description on the upper unit. I agree this is so confusing that even though I mentioned the correct description in the comment above the graphic, it was worth the effort to go back and show the correct description next to the upper image of the A c c u m u l a t o r .

Coming back having this DIY project back on my radar, in my que, and being busy, I thought I might just take it to the dealer. They quoted me $1500 labor, $873 Booster Pump/ Accumulator (47070-47060), $882 Actuator Assy/aka Master Cylinder (both 210 & 340 PN's above). So, in the neighborhood of $3,450 w/ tax. Checking independant shops, several said they would not touch it. A few others quoted the same or more than my local Toyota Dealer. I asked the Toyota shop labor rate, and they said $250/hr. So I assume this is a 6 hour job for them.

Then I ran across a few discussions where people had found used parts supposedly from vehicles with known mileage (like 45k-75k) for ≈$150-$250. I thought, for +/- $200 per part, that might be worth looking into. BUT, I only found used parts on eBay for $350+ to $450+. And could not be sure what part number they were actually selling! Forget that for 'USED'. I found several online Toyota dealers with "online only" pricing of ≈ $600-$625 w/ shipping for both parts (see links to parts above in my original post).
Now my thinking is to buy one of these new $625-ish upper ACTUATOR Assemblies and just replace it, the top more accessible unit.

But there is still a question about a part number on the actual Actuators. On eBay, two used Actuators showed OEM laser etched part numbers of 47210-47140 (link), the other showed, best I could tell, 47210-52020 (link) or see attached screenshots. Both ads say these are for 2010-2015. Well, we know they are not for 2010, but should be the earlier 47050-47210 Actuator version. If I assume the first 5 etched numbers are supposed to correlate to the second 5 digits of the Toyota PN... I don't know what the second 5 ETCHED numbers mean? When I remove my car's Actuator and it has etched on it "47210-1234" or whatever), does the brand-new part I buy online need to have all 10 laser etched digits match what my old Actuator has etched on it???


"(or the chassis subframe, which I kid you not is how the repair manual originally said to do it)."
An independent shop I was quoting was talking about how big this job was because it called for removing the subframe. I told him this was wrong, it is accessed from the top. I thought he was high , but now I see he was reading what Toyota had published. Maybe a very old version, IDK.

Anyway, I'm hoping to get some clarity on
1) The correlation of Toyota's published PN's and what Toyota had etched on their actual OEM Actuators.
2) Should I post a sound video for you to see if your eagle ears might have an educated guess if it sounds like a) good (or fair) chance it is just the valves in the Actuator vs. b) well...... it sounds like the lower Pump/ Accumulator could be a problem too (or instead).

Any advice is appreciated
Dave

 

Thank you for always jumping in to share nuggets of gold you have collected over the years. I have viewed you as a defacto archivist here on Prius Chat. Many thanks. I had saved the 7-23-13 Toyota letter that you shared in a different thread on this topic that I linked to in my original post. But I did not have the 2nd one here, dated 6-10-13. It is saved and filed now!
Thank you sir!

 

Bisco,
You know better than to Cuss and use inflammatory language on this site!