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Brake shoes are crescent-shaped pieces of material that sit inside a brake drum and push against it to create friction and stop your vehicle. Brake shoes are less popular than disc brakes, but they are still used in some vehicles.
Like brake pads, brake shoes are made of organic and metallic materials bonded together to resist the intense heat and pressure that they undergo. They are designed to fit precisely in a brake drum and contact surface of cylinder pistons.
Friction Material
There are many different types of friction material on brake pads and shoes, and each one has its own unique properties. Most of these materials are mixed and matched in complex formulas to produce a product that meets a specific customer’s needs.
Non-asbestos organic (NAO) and semi-metallic are two of the most popular friction materials on the market. NAOs are usually more durable than semi-metallics, but they also wear more quickly.
Ceramic-based friction materials are a newer family of brake material that are marketed to provide quiet, clean operation without generating the dust and noise of semi-metallics or NAOs. They are not designed for heavy loads and braking forces, so they do not last as long as other materials, but they can be used for longer periods of time and do not need to be replaced often.
Standard replacement linings use a fairly limited number of friction formulas that are developed to match the braking performance, feel and noise qualities of the original equipment linings they come on. Premium linings, by contrast, are typically application engineered to deliver a more extensive range of friction formulas that aim to equal or exceed OEM braking performance.
Design
Brake shoes have a very important role in braking systems. They provide the friction material which pushes outwardly against the brake drum, slowing or stopping the vehicle.
They are made from a hard wearing and long-lasting material that can withstand constant pressure and friction. This material is more durable than brake pads, which are usually not designed to endure as much wear and tear.
The brake shoe lining is attached to the rim on one side by either bonded or riveted. Bonded brake shoes are more common than riveted ones, as they offer better bite.
Installation
Brake shoes are curved pieces of metal with a friction material fixed to one side. They carry the brake lining inside the brake drum systems of vehicles.
Each brake assembly has two shoes, a primary and secondary shoe. The leading shoe is closest to the front of the vehicle and the trailing shoe is farther back.
In some systems, there is a self-adjusting mechanism that automatically reacts to brake shoe wear by adjusting the rest position of the shoes so they are closer to the brake drum. The adjuster is like a bolt with threads on it, so that when the adjuster rocks enough, it unscrews and lengthens to fill in the gap between the shoes and the brake drum.
Before removing the brake shoes use a pair of needle nose pliers to release the brake shoe hold down clips on each shoe, or on some types of brakes you may want to use a special brake tool for this. Then pull slightly outward and the shoes will separate from the backing plate.
Maintenance
Brake shoes are an important part of the braking system in your vehicle. They help you stop your car by pressing against the inner surface of brake drums to create friction.
They also dissipate heat produced during braking. However, they require regular maintenance to ensure their optimal braking performance.
One of the easiest ways to do this is by simply changing the brake shoes in your vehicle’s brake drums.
To do this, you need to remove the retaining screws and wheel stud clips on the drums.
After removing the drums, you can inspect them for any signs of wear. Old drums will often have a worn brake lining that will peel off the drum.
If the lining is riveted, you should replace it when it is worn to 1.5mm above the rivet heads. For bonded linings, replace them when they are worn to 3mm.
