Drum brakes are used only on the rear of some vehicles. Today, many vehicles are being manufactured with four wheel disc brakes. Vintage cars were made with four wheel drum brakes, but the braking response was not as good as that of disc brakes. With that in mind, drum brakes only supply the vehicle with up to 25 percent braking capacity. That means the front disc brakes do most of the work. If the rear drum brakes become unadjusted (and there are a few common factors that account for that), the front ones begin to overcompensate. Problems in the front brakes can become apparent if they’re overworked. Keeping the rear brakes adjusted is a safe and effective way to balance the braking system and increase the longevity of your front brakes.

Some vehicles are manufactured with portholes that have not been "punched" out of the backing plate. This will require removing the drum (to get the tab out once it’s punched in). You can use a hammer and a punch to pound in the metal tab, but you should also get a rubber plug to cap it off. If you’re unable to turn the star wheel, you will need to remove the rear drum and the star wheel adjuster mechanism. Often, this part can be serviced by taking it apart, cleaning it, applying lubricant to the threads and then replacing it. If you cannot service the star wheel adjuster, it will have to be replaced.

Import vehicles use a self adjusting cam action lever. There is no star wheel adjuster in these type of vehicles. The rear drum would need to be removed for you to inspect the cam adjuster to make sure it’s working properly. On most of these vehicles, the rear brakes can be adjusted by activating the brake pedal and the parking brake mechanism repeatedly. You can also adjust the parking brake mechanism on these vehicles to tighten the internal ratchet of the handle. Refer to the repair manual for the location of this adjustment.

Using the parking brake on most vehicles will increase the longevity of the rear drum brake adjustments. If you’re not in the habit of using it, try to get into it. Do not drive off with the parking brake applied, however, as this will cause stress in the rear brakes, prematurely wear down the brake shoes, and put the engine and transmission under duress.

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