Smart Fortwo 451 Suspension Leg Front Right O/S Spring Strut Brake Disc Caliper

Smart Fortwo 451 Suspension Leg Front Right O/S Spring Strut Brake Disc Caliper is a complete unit including the suspension strut, spring, brake disc, and caliper, designed for installation on the front axle on the passenger side. This solution allows you to restore suspension geometry and ensure proper brake system operation in a single step, which translates into stable handling, predictable vehicle behavior, and safe braking.

Specifications and technical data

• SKU: A4513202531-2
• Mark: Smart
• Condition: Used
• OEM Part Number: A4513202531
• Substitutable numbers: A4513202531, A 451 320 25 31, A4513300059, A 451 330 00 59, A4514210098, A451 421 00 98, A4514210112, A 451 421 01 12
• Location on the vehicle: Front, Right
• Part type: Strut & Spring Assembly
• Category: Shocks, Struts & Assemblies

Purpose and function of the suspension unit

The described unit is dedicated to Smart Fortwo 451 series models and is mounted on the front right side of the vehicle. Integrating the suspension strut with the brake system components allows for a consistent replacement of the entire corner, which is particularly beneficial after mechanical damage, collisions, or when multiple components are significantly worn simultaneously. A set configured in this way ensures:

• restoration of factory suspension performance characteristics for the given wheel,
• consistent operation of the spring, shock absorber, and brake components,
• reduced risk of uneven wear of tires and brake discs.

Technical construction and key components

The unit consists of a suspension strut with a leg, a coil spring, and brake system components – a disc and a caliper. This configuration allows for maintaining the correct wheel position relative to the body, as well as effectively transferring braking forces to the road surface. The Shock absorbers and struts category includes components responsible for damping vibrations and wheel guidance, which is why the correct selection and installation of this unit has a direct impact on ride comfort and steering precision. Combining the shock absorber with the spring in one strut enables control of suspension deflection, and the presence of the disc and caliper ensures proper operating conditions for the brake pads and even distribution of braking forces on the front axle.

Benefits of using an original Smart unit

Using a unit sourced from the Smart brand manufacturer allows for maintaining compliance with the vehicle's factory design specifications. This means:

• proper fitment to body mounts and the wheel hub,
• preservation of the suspension performance characteristics intended by the manufacturer,
• consistency of brake system parameters across the entire front axle. The item is offered as a used original unit, which represents a reasonable compromise between repair costs and maintaining proper operational parameters. Replacing the complete suspension corner reduces service time and facilitates subsequent geometry adjustment.

Selection, installation, and service aspects

Before installation, it is recommended to verify compatibility with the specific Smart Fortwo 451 version and to inspect other suspension components on the front axle. The unit intended for the right side should be installed only in this position to maintain correct geometry and the direction of forces in the suspension. After installation, it is advisable to perform:

• a wheel alignment and camber check,
• a brake performance test on a diagnostic stand,
• an assessment of the condition of flexible brake hoses and auxiliary mounts. Thanks to this, the entire suspension and brake system on the front axle will operate in a predictable and safe manner, and the vehicle will maintain stability both in city traffic and at higher speeds. If you are planning a comprehensive repair or upgrade of the front suspension area in your Smart and need other components from the same group, such as suspension struts, legs, or complete shock absorber sets, check the available parts in the Smart shock absorbers and struts category. To better understand the relationships between shock absorbers, control arms, and stabilizers and their impact on driving safety, it is worth consulting a technical guide – you will find a detailed discussion in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers.