The parking or emergency brake has to perform two distinct jobs. First, it must be able to hold the vehicle on an incline. Second, it must be able to stop a vehicle under a specific distance if the hydraulic brakes have failed. These standards are set by the Department of Transportation (DOT), and the kicker is these standards must be met with the force applied by a little old lady. But, over time, the cables can stretch and the friction materials change their length and thickness, which is why adjustments to the system are required.
Caliper replacement may be necessary in high-mileage vehicles because of fluid leaks or because the calipers are sticking.
With these vehicles, the major aggravation for shops is brake noise and uneven brake pad wear.
The most common problems that occur in the master cylinder are wear in the piston bore and piston seal failure.
Don’t be afraid to work on battery packs. However, you should be mindful of the potential damage high voltages can cause.
Look at the “big picture” and really consider how the vehicle will operate if things aren’t done correctly.