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The Chevrolet HHR (an initialism for Heritage High Roof) [1] is a retro-styled, high-roofed, five-door, five-passenger, front-wheel drive wagon [2] [3] designed by Bryan Nesbitt and launched by the American automaker Chevrolet [4] at the 2005 Los Angeles Auto Show [citation needed] as a 2006 model.
A wheel cylinder is a component of a hydraulic drum brake system. [1] It is located in each wheel and is usually positioned at the top of the wheel, above the shoes. Its function is to exert force onto the shoes so as to bring them into contact with the drum and stop the vehicle with friction. [2]
Drum brake (upper right) with the drum removed (lower left, inside facing up), on the front of a Ford Falcon Sprint A rear drum brake on a Kawasaki W800 motorcycle. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating bowl-shaped part called a brake drum.
The four-wheel drum brakes of the previous generation were abandoned, as the third-generation G-series vans adopted front disc brakes. [ 5 ] [ 6 ] The front disc/rear drum configuration remained unchanged throughout the entire production of the model line; heavier-duty vehicles received larger brakes. [ 4 ]
The four-wheel drive version had a solid front axle and used leaf springs front and rear. The two-wheel drive version came with independent front suspension and rear trailing arms, both with coil springs. Both versions used drum brakes on all four wheels until 1971, when the entire GM light truck line was fitted with front discs as standard ...
As the S-cam rotates, the two symmetrical brake pads are forced against the brake drum until the pressure is released and the brake pads return to their resting position. [ 3 ] The principle of the S-cam allows the brakes of big vehicles to be more compact and less moving parts, since it only relies on a rotating shaft.
Later, disc brakes were used for the front and drum brakes for the rear. However disc brakes have shown better heat dissipation and greater resistance to 'fading' and are therefore generally safer than drum brakes. So four-wheel disc brakes have become increasingly popular, replacing drums on all but the most basic vehicles. Many two-wheel ...
On all pickup trucks, the model line was fitted with front disc brakes and rear drum brakes (4-wheel disc brakes were exclusive to the C3500HD [18]). Anti-lock brakes (ABS) were introduced as part of the redesign. From 1988 to 1994, ABS was used on the rear wheels (on K-Series trucks, only when in two-wheel drive [8]). From 1995 to 2000 ...