... :2L(stainless steel) voltage: 12V,24V,36V,48V etc our electric cars braking power is made of mini oil-free vacuum ... , pressure sensor, pressure controller, etc, it's used for electric cars, electric vans, electric tour bus and other braking powers, distinguishing features of ... )volume:2L(stainless steel)voltage: 12V,24V,36V,48V etc electric brake vacuum pump