Advantages:
Drum brakes are employed in most heavy-duty trucks, some medium and light-duty trucks, and few cars, dirt bikes, and ATVs. Drum brakes are often applied to the rear wheels since most of the stopping force is generated by the front brakes of the vehicle and so the warmth generated within the rear is significantly less. Drum brakes allow simple incorporation of an emergency.
Drum brakes are occasionally fitted because the parking (and emergency) brake even when the rear wheels use disc brakes because of the main brakes. Many rear disc braking systems use an emergency within which the piston within the caliper is actuated by a cam or screw. This compresses the pads against the rotor. However, this kind of system becomes rather more complicated when the rear disc brakes use fixed, multi-piston calipers.
Disc brakes depend on the pliability of caliper seals and slight runout to release pads, resulting in drag, fuel mileage loss, and disc scoring. drum brakes return springs give more positive action and, adjusted correctly, often have less drag when released. it’s however possible to style special seals that retract the piston on hydraulic brakes.
Since a drum brake’s friction contact area is at the circumference of the brake, a hydraulic brake can provide more braking force than an equal diameter disk brake. The increased friction contact area of hydraulic brake shoes on the drum allows hydraulic brake shoes to last longer than disk brake pads employed in a brake of comparable dimensions and braking force.
To list advantages of drum brakes:
-
- less expensive to provide
- a slightly lower frequency of maintenance because of better corrosion resistance compared to disks.
- the built-in self-energizing effect requires less input force (such as hydraulic pressure).
- wheel cylinders are somewhat simpler to recondition compared to calipers.
- minor weight savings, primarily from much smaller and lighter hydraulic cylinders vs. calipers.
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