Choose from a wide range of shock absorbers within the NAPA portfolio, all reflecting the most popular applications in the UK market with more parts being added all the time.
The average car is likely to need at least one set of replacement shock absorbers during its lifetime. Replacing these products can restore vehicle handling, safety and ride comfort to their original levels. Shock absorbers should be regularly inspected, and replaced in axle pairs to ensure even wear. Uneven shocks are a valid safely concern.
The driver may not notice gradual deterioration in a shock absorber’s performance, but the damping force can differ up to 25% between a worn shock and a new one, which will almost certainly be noticeable when braking heavily or other avoidance manoeuvres, with potentially dangerous results.
NAPA shock absorbers match the quality of OE replacement parts, ensuring a fit first-time replacement. The range includes oil-filled or gas pressure units that match the specifications of factory-fit OE shock absorbers.
All shock absorbers are rigorously tested as part of the manufacturing process. To ensure your safety and comfort, all products undergo damping force, temperature, friction and durability characteristics and corrosion resistance tests. Finally, NAPA inspects the paint finish and packaging to make sure it matches your expectations and reaches our own NAPA standards approvals.
The Technical Bit
The basic principle of a shock absorber is that as the unit compresses or rebounds, valves within the oil-filled tube restrict the flow of oil to reduce the movement of the piston. This reduces oscillation of the road spring, keeping the tyre in contact with the road and improving ride comfort.
Mono-tube and twin-tube shock absorbers perform the same tasks but differ in design. A monotube gas shock is filled with oil and gas at 1.6-2.6MPa pressure, and a movable separator piston separates the two substances. A piston valve attached to the piston rod controls oil flow and damping effect.
A twin-tube shock absorber has two concentric chambers: the oil-filled working chamber housing the piston rod and piston valve; the compensation chamber formed of the space between the working cylinder and the outer tube; this is filled with two-thirds oil and one third air. In a gas-pressurised shock, gas at 0.3-0.9MPa replaces the air. The piston valve and a valve in the base of the working chamber control oil flow and damping effect.
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