Brake actuator noise?

So I’m having very frequent actuator noise, even when not braking, which starts with the hissing/vacuum/ pump sealing sound, then the ol familiar actuation noise, and finish up with some creaking as I release the brake coming from underneath the car . … I should add I’ve got (!) 65 code, which is hydrolic pressure malfunction I think. When I reset the abs/brake/(!) light, it stays off for days and only activates when my gf is driving the car fir some reason. It also throws a p0420 but I’m not even gonna fight that battle again…. I should add that the car drives somehow differently when I reset the lights (the mfd has always shown the battery discharging when I’m stopped, until I reset the light or put it in park, dr. Prius shows the difference between park and drive as a negligible 1 or 2 amp at most)…she also has 500,000 miles on the odo of which 300,000 are real. When I got the car it had no brakes and an exploded battery and the accumulator had to be replaced. I drove it across the country with these lights on and the brakes work but feel a little “off” somehow…please someone tell me I just need the brakes bled… also I never determined what could cause the battery modules to explode like that… mysterious prius

 

Yeah, and didnt do so hot of a job when i did because it still goes out sometimes, the mfd too, if i recall correctly they occur at the same time but its been a while since that has occured.

 

i believe it was new, but that's just what the guy who did a bad job told me so who knows. Those things are expensive new, wouldnt put it past him to find a salvaged one

 

From another thread it seems like i may have a valve sticking issue rather than a air in the break lines issue. Here is the sounds im talking about PLEASE listen, and tell me what the vaccum sealing hissing noise is at the begining , before the actuator, also what's that creaking as i release the pedal?

Here;'s my other post Frequent brake actuator noise after service appointment? | Page 2 | PriusChat