what is meant by the term leading brake shoe?

Answer 1

Also referred to as the PRIMARY brake shoe, it is usually the brake shoe on the side towards the front of the vehicle. This is the brake shoe that carries most of the braking load. Because of this, the primary brake shoes on some vehicle applications have the thicker lining than the rear shoe. That would make the shoe on the rear side of the vehicle the trailing, or SECONDARY brake shoe.

Answer 2

If you imagine looking at a brake assembly with the actuator at the top and the shoes pivoted at the bottom, then if the surrounding brake drum is rotating clockwise the left shoe is trailing and the right is leading. The leading shoe tends to be twisted closer into contact with the drum by the rotation and friction, and the trailing shoe tends to have the pressure reduced by the same means. Before disc brakes most cars had double actuators on the front, allowing twin leading shoe action, and single on the back. This meant that the front brakes worked most effectively when the car was going forward, and the back were equally effective both ways

Answer 3

In a drum brake there are two shoes, held in by springs and colletts. When adjusting them up one has to lead, ie be the first to make contact with the drum. This is done by turning the square adjustment sticking out at the back of the drum plate. Try to use a snug fitting spanner, not pliers or mole grips. Turn until the shoe just catches the drum, then turn a quarter turn more. Next adjust up the other shoe so it just trails on the drum.
The reason for getting this balance is to stop loud resonant noises when braking. If each shoe is applied equally it sets up an occillation within the drum. You may have heard large three axle lorries do this when pulling up sharply , or buses tend to do this when braking in reverse. Steve

Answer 4

A single leading shoe brake system (SLS) is one where both brake shoes are actuated from a single double acting wheel cylinder. The shoes are free to pivot at one end and expand apart at the wheel cylinder end.
The leading shoe is the one who's leading edge makes contact with the brake drum at the wheel cylinder end relative to the direction of rotation of the drum.
This gives the leading shoe a self servo effect where the rotation of the drum pulls the leading shoe tighter to the drum giving more stopping power.
A twin leading shoe brake set up (TLS) uses two single acting wheel cylinders at opposite ends of the back-plate, each shoes leading edge is pressed against the drum by it's own wheel cylinder giving a self servo effect to both shoes which means you get a more powerful brake. The down side to a TLS system is that there is no self servo effect when the vehicle is driven in reverse so the brakes are much weaker in this situation.Not easy to describe without a diagram but hope this helps.

Answer 5

Imagine your brake (brake back plate) as a drum shape... The Leading shoe means the brake shoe that is on the top of this drum shape, when braked the shoe is ahead of it's pivot (therefore leading) there is also a trailing shoe, this is the brake on the bottom of the drum this co-incides and works against the leading shoe to increase it's input and therefore increases the braking effect. A good website for diagramed details is:www.splashwomb.f2s.com/drumbrakes.htm

Answer 6

it is a term that is not applicable to modern disc brakes but when brake shoes are used it is the forward or uppermost of the two shoes and on the rear brakes where there was only one wheel cylinder piston it was the shoe that was activated by the hydraulic piston, the cylinder then slid in the backplate and activated the other shoe, the trailing shoe.

Answer 7

A leading brake shoe is the primary source of braking power due to the larger size.

Generally brake shoe sets come with two different sized shoes.
The larger of the two is considered the the leading or primary shoe.

Answer 8

The shoe that is supposed to go toward the front side when you put the shoes on the backing plate...it is usually the one that has the shorter length brake material on it...

Answer 9

As you look at the shoes there will be one to the left and one to the right, the left one is the leading and the right is the trailing.

Answer 10

What Is Meant By Leading