2016 Prius 3 Touring Brake Actuator Noises

you have nothing to worry about until you get trouble codes. hard to say whe too much is too much before then. you may never have issues.

 

it could be coming, but there's no way to know, unless tech stream has a testing procedure

 

Gen 4 has quite a different hydraulic system, if I remember right. I'm not sure how many lessons from gen 3 even carry over straight.

 

We have a thread somewhere that compares the gen 3 and gen 4 brake hydraulic systems. I'd want to review that before answering.

IIRC, there's a generation where they did away with the accumulator altogether. but maybe that wasn't till gen 5.

 

While there are a number of differences between the Gen3 & Gen4 brakes, the basic "it uses the pump and accumulator to run everything" is common across both systems.

That said, I would expect the pump to not run very often if you do not use the brakes while "ready". If it cycles on just sitting there, (more often than once in 10-20 minutes?), I would think there is "excessive" internal leakage - somewhere.

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I do not know. How often does your pump run?

There has been advice to use a mechanic's stethoscope to try and listen for the sound of moving fluid when there shouldn't be any. If the brake actuator makes "gurgle-swoosh" sounds, then the leak could be inside it.

If only the pump assembly makes noise, then maybe the internal fault is there.

Here's a basic system diagram (from elsewhere in the forums). The booster pump assembly and the (upper?) brake actuator are the only parts that contain high pressure fluid while the brakes are not in use.


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