Drum Brake Shoe Position, Drum Brake Wikipedia

The adjuster provides the resting position for the brake shoes.

Hinata. When the brakes are applied it is that cohesive part that brutally grabs at the road an action that forces this. The larger shoe should go forward not rearward. When you release the brake pedal the retracting springs bring the brake shoes back to their original position.

The friction between the brake linings and the drum causes the drum to stop rotating. In modern cars the adjuster is automatic and is designed to self adjust as the brake shoes wear out. A brake shoe placed symmetrically in a drum of 305 mm diameter and pivoted on a fixed fulcrum e has a lining which makes contact with the drum over an arc as shown in fig.

So when the servo pushes on it the rotation of the drum wedges the shoe downward and against the drum. A self energizing brake shoe uses a pivot slightly out of alignment with the axis and rotation of the wheel. The front shoe tries to jam itself into the brake drum which makes it the stronger shoe braking wise when the brakes are applied so its smaller to match the power of the larger secondary shoe.

A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder shaped part called a brake drum. The leading brake shoe is the front primary shoe of a set of brake shoesthe trailing shoe is the back shoe of each setlet say you got the brake drum off the rearand you were sitting there looking at them after the drum came offthe shoe that is facing the front of the car is the leading shoe the one that faces the rear is the trailing shoebut the other way of also knowing which is which. You are correct the shorter shoe should be forward on electric brake assemblies like the 12 inch electric brake assembly 23 105 that your selectedin my experience the shorter shoe is always the shoe that is pressed against the drum first and the leverage from that connection is used the activate the longer shoe.

Brakes are engineered in this way to provide smooth braking performance. It is needed to maintain proper gaps between the shoes and the drum. When the topic is drum brakes there seems to be a lack of a consensus as to where the larger shoe should be positioned.

The term drum brake usually means a brake in which shoes press on the inner surface of the drum. 444when the shoe is operated by the force f the normal pressure at position o is p053 sino mpaif the coefficient of friction between the lining and the drum is 02 and the width of the lining is 38 mm find the. When the brake pedal is released return springs pull the brake shoes away from the drum.

Bolted together as one cohesive part are the rear wheel brake drum and axle shaft. Take note of some drum brakes that have double wheel cylinders top and bottom both brake shoes are self energizing and the same size. So the brake shoe takes some of the energy from the drum and uses it to enhance braking power.

Here is my view.