You slow down when you brake by applying friction from the brake pads to the wheels. Sometimes when you use heavy braking, the brake pads prevent the wheel from spinning. In other words, the wheel locks up when the brake pads are forced on the drum/disc so firmly.
Due to your momentum, you will continue to go ahead for a short distance even while the wheel is still stationary; this is skidding, in which the tires drag rather than roll over the pavement. When this occurs, you have very little control over the car.
Avoid abruptly slamming on the brakes in a non-ABS car to prevent a wheel lockup, especially if the surface is slippery. By making the wheel roll, the surface grip prevents wheel lockup.

Replacement brake wheel cylinders typically cost between $159 and $194. Between $95 to $119 is the projected range for labour charges, while $64 to $75 is the range for parts. This range does not account for taxes, additional expenses, your specific vehicle, or your location. There could be more repairs required.

Each automobile often has its maintenance schedule. As a result, depending on your automobile, you must repair your wheel cylinders at different intervals. In many situations, recommendations for when to change your wheel cylinders may be found in the owner’s handbook. Wheel cylinders often need to be changed when a car has more than 75,000 miles. It is crucial to replace this equipment as soon as possible because damaged wheel cylinders can cause serious problems. Fortunately, changing a wheel cylinder is frequently not very expensive.

Here are some typical signs that wheel cylinders are bad:
The Pedal Is Spongy Or Sinking : A soft or sinking brake pedal can detect a lower hydraulic pressure that touches the car’s floor. While braking, you’ll also experience a slow brake reaction. It may happen due to a braking fluid leak, such as a damaged wheel cylinder seal.
Rear brake noise : Brake shoes that aren’t getting enough pressure from a malfunctioning wheel cylinder might make loud grinding noises.
Leaking Brake Fluid : A leaky brake wheel cylinder can be identified by any braking fluid collecting or seeping on the back wheels.

In terms of trained technicians, the days of rebuilding wheel cylinders are passed. Although it takes time and increases the chance of a comeback if done incorrectly, rebuilding is still a repair option.
A wheel cylinder cannot be restored by gentle honing if it has considerable wear or pitting. A sharpened cylinder still has greater clearance than a fresh cylinder. In many wheel cylinders, .006 of an inch or less of clearance between the piston and the bore is advised. More than that increases the danger of the piston sticking, seal leaking, and piston shaking, all of which will accelerate wear.