Gen3 friction brake sensor OBD Value - what is it & what to monitor for booster pump failure

Can't wait to see the answers to this monitoring the friction never heard of such a thing That's interesting The slide pins no the computer's not going to tell you anything about the slide pins on your calipers You are going to have to remove the lug nuts that attach the wheel to the wheel studs put the wheel on the ground and sit on it rather than the cold ground and then if your pads are really worn you might be able to check it like that but usually not on a Prius because the pads are usually really good so then you have to take the pads out sit the caliper back on the slide pins and the requirement for my cars all five of them is that I can pull the caliper across the slide pins with my index finger and push it back across the slide pins with that same finger back and forth back and forth If I need my whole hand to move the caliper then I push the caliper off the slide pins and either replace the slide pins they're very cheap or clean and lubricate the existing slide pin see the rust Make that not be there proper Brake lube applied .try again .. wella .

 

If you see the inner or out or pad at half the thickness of one of the other generally this is a slide pin issue

 

There are a few different brake fluid pressure sensors in the actuator. Those can tell you: how much fluid pressure is banked up in the accumulator, what pressure is developing in the boosted master cylinder from your foot pressure, and what pressure is reaching the front brakes (but only when the FLH and FRH valves aren't closed).

For that kind of question, you'll learn more just by quickly inspecting your brakes every time you rotate tires, or so. Sometimes ya gotta get some grime on your hands.

You can watch the accumulator pressure, which goes sharply up when the pump runs, and should decline very very slowly between pump runs (except when you use some up by braking, of course).

But if you're able to hear the soft rattlesnakey or joy-buzzery noise of the pump, your ears should be all you need to keep tabs on that.

It's normal for the pump to run when you first open the door to get in the car if it's been sitting a while, and it's normal to run again every few times you've used the brakes, and you might notice it run at other times if you tend to sit in the car and read novels or what not, but those times should be more like hours apart, not minutes and definitely not seconds.