... (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 ... :25-30L/Minnoise:50db(A)volume:2L(stainless steel)voltage: 12V,24V,36V,48V etc electric brake vacuum pump