As wheel cylinders expand, what happens to the brake shoes?

When the wheel cylinders expand, they push the brake shoes outward. This action occurs because the hydraulic pressure from the brake fluid forces the pistons in the wheel cylinder to move, which in turn moves the brake shoes towards the brake drum. This contact between the brake shoes and the drum is what creates the friction necessary to slow down or stop the vehicle.

As the brake shoes move towards the drum, they press against its surface, increasing friction and enabling effective braking. This process is essential for the operation of drum brake systems, which rely on the expansion of wheel cylinders to apply force to the brake shoes and create the necessary braking effect.