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Which Brake Shoe Is Primary And Secondary?How to Distinguish

date 2022-06-09

Brake shoe refers to the accessory that is pushed outward by the action of the brake cam or the push rod to suppress the brake drum and act as a brake. It is installed on the brake drum and is one of the key safety parts in the automobile braking system. 

The shape of the brake shoes is like a half-moon. When the brakes are stepped on, the two half-moon-shaped brake shoes spread out under the action of the brake wheel cylinder, supporting the brake shoes to rub against the inner wall of the brake drum to slow down or stop.In the meantime,brake shoe Brake shoes are divided into primary and secondary Brake shoes.

 

Which Brake Shoe Is Primary And Secondary?

One wheel cylinder operates the brake on each wheel. Two pistons operate the shoes, one at each end of the wheel cylinder. The leading shoe (closest to the front of the vehicle) is known as the primary shoe. The trailing shoe is known as the secondary shoe. (Drum brake - Wikipedia)

 

Leading(primary) shoe

"Leading (or primary) shoe" is a term referring to the shoe that moves in the direction of rotation when it is being pressed against the drum. 

 

Trailing (secondary) shoe

The other shoe is called the “trailing (secondary) shoe.” The leading shoe is pressed in the same direction as the rotation of the drums, and this rotation helps to press the shoes against the drum with greater pressure for stronger braking force. This is called the servo effect (self-boosting effect) which realizes the powerful braking forces of drum brakes.

 

How to distinguish between primary and brake shoes of brake shoes?

You have a primary and a secondary shoe. Primary is long pad and secondary is short pad. Long is to the back and is considered primary because of the auto-adjuster. short is front shoe.If the brakes are working properly the shoes should wear the same, the thicker shoe should be the front (new) more material sheds off the front because its being pulled into the drum.

In drum braking systems, the leading shoe is one that rotates in the direction of the drum. The trailing shoe is on the other side of the assembly, and pulls away from the rotating surface. Leading-trailing shoe braking systems are just as capable of stopping reverse motion as they are at stopping forward.

 

Through this article, I believe you have a better understanding of ”Which Brake Shoe Is Primary And Secondary“. If you have more questions about brake shoes, or want to buy wholesale brake shoes, you can contact us through the website

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