Brake system pressurizing every 11 seconds?

Hello everyone, new to the forums have a 2012 Prius V, I do apologize if there is a thread out there on this issue . I have noticed my car making the buzzing noise of the i believe brake system pressurizing but it does it every 11 seconds give or take . It makes the noise when the car is on and parked , and when i drive . I dont think this is normal correct me if i am wrong , i started to notice this along with when i press the brake pedal lightly and not fully it makes a hizzing noise or some type of pump letting air out, i also feel it in the braking it is not as smooth as before , feels kinda bumpy braking at low speed.

 

Thank you guys , it has 110,000 miles. I called a local prius independent repairman he said the ABS pump is going out and new it cost like $2000 but we can soruce a used one even tho they are hard to find as the prius regular and prius V are different pumps . I wonder why there is no recall on this ABS pump, i assume if the pump goes out i am out of brakes right ? the first 3rd gen priuses had a similar issue and had a recall.
By abs pump does it mean abs accumulator ?

 

Thank you guys for all the input. Toyota only sells the pump and actuator as a whole so to get just the pump you have to buy used i am pretty sure. I wonder if i can repair the leak tho if it's air thats leaking out