The caliper is an assembly mounted to the vehicle with a bracket so it frames the rotor. The four digits following one of the above prefix numbers are the chronologically assigned number to a family of drums made from the same pattern. This is not intended to be a stand alone text book on basic brake systems. The shoes are pulled away from the drum by the springs when the brakes are released. As the shoes in drum brakes wear, brakes required regular manual adjustment until the introduction of selfadjusting drum brakes in the 1950s. Brake adjusters handbook bureau of automotive repair ca. Hydraulic and mechanical drum brakes maintenance manual no. Heres a guide to the two types of passengervehicle brakes, disc and drum. Inside each drum brake is a wheel cylinder that expands with the surge of brake fluid, pushing the brake shoes against the inside of the brake drum.
All numbers with prefix 6 indicate that the drum is made of special alloy. Please note that part numbers or individual component offerings may now be supported. Working of drum brakes drum brakes work on the same principle as the disc brakes. Order the ezgo brake drum hub assembly and stop with confidence. Caliber holds the cylinder, caliber piston, and brake pads. The information in this catalog is meant to capture the associated service kits, component parts and crossreference data needed to support product in the field. A thorough understanding of modern brake systems, including manual systems, power assisted systems, discdrum systems, discdisc systems and antilock. Acdelco 18b274 professional rear brake drum assembly. These lines connect the front pipes to the hydrovac and after many years of use acquire a buildup of residue that restricts the flow of fluid. Buy acdelco 18b274 professional rear brake drum assembly. The caliper piston is made of heavy gauge stainless steel to help resist corrosion. Brake drum numbering system all brake drum numbers with prefix 5 indicate that the drum is made of standard iron. Is there thus a maximum brake torque angle and how can one find it.
Drum brake also has an adjuster mechanism, an emergency brake mechanism and lots of springs. Allow the solution to flow between the brake drum and the brake support or. Recommended service intervals are after the first 500 miles and then every miles. Learn how to replace your drum brakes including the wheel cylinder and bleeding the brakes. When it comes to driving safety, nothing is more critical than your tires and brakes. Drums free delivery possible on eligible purchases.
Refer to your owners manual for a recommended schedule. Pdf analysis of drum brake system for improvement of braking. Large drum surrounds the brake shoes and the hydraulic wheel cylinder. An introduction to brake systems sae brake colloquium october 6th 2002 daimlerchrysler this presentation was originally created as a one hour lecture class. Remember that funny brake sounds, smells or performance are indicators you need to get your. Complete guide to disc brakes and drum brakes les schwab. The brake torque is a function of th e maximum normal force, which is the vector sum of the tensions t 1 and t 2, the brake drum radius d brake 2, and the coefficient of friction, which can be easily found using the law of cosines. This drum brake replacement is specifically for a ford ranger pickup truck, but it applies to most other cars as. The ultimate guide on how to replace drum brakes youtube. For ongoing updates to this parts book visit us on the web at.
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