... steel) voltage: 12V,24V,36V,48V etc our electric cars braking power is made of mini oil-free vacuum pumps, pressure ... for electric cars, electric vans, electric tour bus and other braking powers, distinguishing features of good durability, low noise, maintenance-free ... )volume:2L(stainless steel)voltage: 12V,24V,36V,48V etc braking power vacuum pump