8159 miles and just completed the first maintenance item. Rotated the tires. Wow don't know if I can keep up with all this maintenance I have to complete. ?
Brake fluid is strongly hygroscopic and there is no system tight enough to keep it from absorbing water. In a track car, fluid has to be replaced every few months, as absorbed water lowers the boiling point of the fluid, which can get very hot inside the calipers on the track causing the pedal to become spongy (hydraulics work because fluid is essentially incompressible - vapor in the system renders the brakes ineffective since gasses are highly compressible). This isn't a serious problem in the Bolt, where a number of effects greatly reduce the need for the friction brakes to dissipate large amounts of energy in a limited time. At some point, the fluid may become saturated enough with water that it can affect components in the system: I suspect this is behind the 5 year interval, where proper choice of materials can extend the necessary change interval.Dunno if there's a difference, I think they should be generally the same. Heard it's based on moist air getting into the electric car brake master cylinders unless Chevy managed a 100% seal.