The Components found in a typical drum brakes system are we have the back plate assembly ,the brake drum ,wheel, nuts
First we will take a  look at  detail of back plate assembly and brake drum
Brake drums
Brake drums are made up of highly cost oil which conduct heat well and this slot away the drum rotates on its axle and wheel providing the friction surface when the brakes are applied
Back plate assembly
It contains over components    requires   to operate the  drums brakes let’s explore each components in term the back plate remain stationary and provides a fixed space for other components to attached
Next we have brake shoes
It consists of   steel frame fitted with a friction material or brake lining this material is bounded  on the outer phase of  shoes frame there is a wheel cylinder
A wheel cylinder is connected to hydraulic system and contained piston which are force outward by hydraulic pressure when the brakes pedal is pressed the shoe retaining spring pull the brake shoe down on to the back plate keeping in its position A tensioning spring is fitted to the shoe when brakes pedal is released the hydraulic pressure is reduced allowing the tensioning spring to withdrawals the wheel cylinder piston and pulled  the brake shoes are away from the drum this allows to wheel to rotate once more freely
Drum brakes are  just used as  self adjusting mechanism the adjustor just  take  as excessive clearance creating as a friction material on the brake shoes Vas reducing the current movement of shoes this bring the brake shoes closely to the drum and maintains the consistent pedal field and braking response finally we have hand brake mechanism the hand brake cable enters the drum  into the back plate and connect the brake shoe liver arm cable electronic and hydraulic system are founded handbrake but in our example cables are used to activate the rare brakes when the hand brakes pulls upward the cable is tensioned forcing the brake shoes outs against the brake drum the hand brakes maintained the tension and till the hand brake released  .