cooled.- Lubricate the water pump.
- Inhibit rust and scale buildup.
- Protect against the engine coolant freezing when temperatures dip below
freezing.
Over time engine coolant (also referred to as antifreeze) chemically breaks
down and can’t perform these vital functions. The industry-accepted
recommended change interval is every two years or 24,000 miles. Some
manufacturers use coolant that is supposed to last 100,000 miles. However, when
a leak ensues and oxygen gets into the sealed system, oxidation occurs and
produces rust. There’s also a buildup of acid and scale, a decrease of lubrication,
and ultimately a loss of protection. For this reason, systems that use the high
mileage antifreeze should undergo periodic inspection for leaks, rust, and scale
buildup to avoid problems caused by leaks.
Brake Fluid
Brake fluid (a hydraulic fluid) is the medium through which the brakes function.
More specifically, when the brake pedal is depressed, the fluid courses through
the system under intense hydraulic pressure and mechanically activates the
components in the brake system, stopping the vehicle. Brake fluid is hydroscopic
in nature; when exposed to moisture it will absorb it. When moisture is absorbed
into the brake fluid it finds its way to the lowest point in the system and forms
rust. That’s why it is important to keep an eye on brake fluid for rust and
sediment buildup. If this is evident, the system should be flushed out with a
pressure brake bleeder and the fluid replaced.