Backing plates are metal plates that function as the solid foundation for drum brake. Made of steel, these plates have the wheel cylinder mounted on them to which the brake shoes are then attached. ... This motion applies pressure upon the hydraulic fluid found in the brake lines.

What is a backing plate on a truck?

They are pressed plates of steel that provide a support for the brake shoes and wheel cylinder. ... Those components then combine to provide an outward pressure and braking force on the rotating brake drum, slowing the car down.

How much does it cost to replace a backing plate?

How much does it cost to replace backing plates? The cost of brake backing plates may vary depending on inclusions and the vehicle model. Prices for an individual piece or a set may range from $34 to $197.