vacuum:0.065-0.08Mpa flow rate:25-30L/Min noise:50db(A) volume:2L(stainless steel) voltage: 12V,24V,36V,48V etc our electric cars braking power is made of mini oil-free vacuum pumps, pressure sensor, pressure controller, etc, it's used for electric cars, electric vans, electric tour bus and other braking powers, distinguishing features of good durability, low noise, maintenance-free, good ...