Strut Mounts

Strut mounts connect the upper end of a suspension strut to the vehicle body, providing a secure mounting point while helping manage movement, vibration and suspension loads. Also known as strut top mounts or upper strut mounts, their exact design and function depend on the suspension system and position on the vehicle.

Some mounts are designed primarily for replacement and suspension servicing, while other designs can reposition the top of the strut to alter suspension geometry. Bushings and bearings within the mounting arrangement may also be serviceable components. Correct fitment matters because the mount forms an important connection between the strut assembly and vehicle structure.

What Are Strut Mounts?

Strut mounts are the components that connect the top of a strut assembly to the vehicle body or chassis. They locate the upper end of the strut while often using compliant material to help isolate vibration and road impacts from the body.

On many front strut suspension systems, the mount also incorporates a bearing that allows the strut assembly to rotate as the wheels steer.

Because the upper mounting point influences the position of the strut, it can also form an important part of the suspension geometry.

The exact construction varies between vehicles, so the mount, bearing and associated bushings should be considered according to the specific suspension design.

Strut Top Mounts vs Upper Strut Mounts

Strut top mount, upper strut mount and strut mount are commonly used to describe the same general component: the mounting point at the top of the strut assembly.

Terminology varies between manufacturers and suspension designs.

The important distinction is not the wording but the component's function and fitment. A replacement must match the strut assembly, body mounting arrangement and any bearing or bushing requirements of that suspension system.

What Do Strut Mounts Do?

Strut mounts locate the upper end of the strut and transfer suspension loads into the vehicle structure while helping isolate unwanted vibration. On applicable front suspension systems, they can also provide the pivot required for the strut to rotate during steering.

Depending on the design, a strut mount may:

• Secure the strut to the body
• Help isolate road noise and vibration
• Allow steering rotation through a bearing
• Establish the upper strut position
• Influence suspension geometry
• Accommodate controlled movement within the mounting assembly

Because these functions are closely connected, wear in a mount or bearing can affect more than just noise.

How Many Strut Mounts Does a Car Have?

There is generally one upper mount for each strut assembly, but the total number depends on the vehicle's suspension design.

A vehicle with front struts will commonly have one mount on each side of the front suspension. If strut-type assemblies are also used at the rear, there may be rear upper mounts as well.

Vehicles using separate springs and shock absorbers may use different mounting arrangements, so there is no universal number that applies to every car.

What Are the Signs of Bad Strut Mounts?

Worn or damaged strut mounts can contribute to knocking, clunking, vibration or steering-related noise, but these symptoms do not confirm that the mount itself has failed. Other suspension and steering components can produce very similar behaviour.

Signs worth investigating include:

• Knocking or clunking over bumps
• Creaking or grinding during steering
• Binding or roughness as the steering turns
• Increased vibration through the body
• Visible cracking or separation in compliant mounting material
• Excessive movement around the upper strut mounting point
• Changes in wheel alignment or uneven tyre wear

Clunks, Creaks and Vibration

A damaged mount can allow movement between the strut assembly and body that would not normally occur.

On a front strut with an upper bearing, wear or damage can also affect how smoothly the assembly rotates during steering. This may produce creaking, binding or other noise as the steering wheel is turned.

Noise alone is not enough to identify the failed component.

Other Causes to Rule Out

Similar symptoms can result from:

• Worn shock absorbers or struts
• Ball joint wear
• Worn control arm bushes
• Sway bar link or bush wear
• Broken or damaged springs
• Loose suspension hardware
• Wheel bearing problems
• Other steering or suspension faults

A qualified technician should inspect the complete suspension before parts are replaced based only on a noise or change in steering feel.

How Do You Check Strut Mounts?

Checking strut mounts involves inspecting the mount, bearing and surrounding components for deterioration, excessive movement or abnormal noise. Some checks can be made with the suspension assembled, while a complete assessment may require further disassembly.

A technician may look for:

• Cracks, tearing or separation in compliant material
• Corrosion or physical damage
• Excessive movement at the upper mount
• Noise while the steering is operated
• Roughness or binding from an upper bearing
• Loose or damaged mounting hardware

The spring, strut and surrounding suspension components should be inspected at the same time because faults elsewhere can produce similar symptoms.

How Long Do Strut Mounts Last?

Strut mounts do not have one fixed replacement interval. Their service life depends on road conditions, vehicle load, suspension design, component construction, environmental exposure and how the vehicle is used.

Regular inspection is more useful than assuming replacement is required at a particular distance.

The mounts are also worth inspecting whenever struts or springs are being replaced. Because strut mount replacement can require much of the same disassembly, servicing a worn mount at the same time can avoid repeating the job later.

Replacement should still be based on condition and the applicable service requirements rather than age alone.

Types of Strut Mounts

Strut mounts can use different designs depending on whether the priority is standard suspension location, component servicing or geometry adjustment. The correct type must suit the suspension system and intended function.

Mount construction, bushings, bearings and adjustment features can all vary by application.

Front Strut Mounts

Front strut mounts locate the upper end of the front strut assembly.

Where the strut rotates with the steering, the mounting arrangement may incorporate a bearing to allow that movement. The bearing and mount can be integrated or serviced as separate components depending on the design.

When replacing a front strut mount, confirm whether the bearing, bushings or associated hardware also require inspection or replacement.

Strut Mount Bushing Kits

Bushings within a strut mounting arrangement provide controlled compliance between connected components.

Their job can include accommodating movement and reducing the transfer of unwanted vibration through the mounting point.

Bush dimensions and functions vary, so a strut mount bushing kit should be selected for its specific suspension application rather than treated as a universal replacement.

What Are Adjustable or Offset Strut Top Mounts?

Adjustable or offset strut top mounts change the upper position of the strut to alter suspension geometry where the suspension design allows it. They serve a different purpose from a standard replacement mount because the mounting position itself is used to create a geometry change.

Depending on the design, an offset mount may reposition the top of the strut by a predetermined amount, while other adjustable designs can provide a broader range of positioning.

The amount and direction of correction are application-specific.

Caster and Camber Adjustment

Moving the upper strut position can alter caster, camber or both, depending on the suspension geometry and direction of the offset.

Camber describes the inward or outward tilt of the wheel when viewed from the front. Caster describes the fore-aft inclination of the steering axis when viewed from the side.

Changing either can affect tyre contact, steering behaviour and wheel alignment.

Whiteline offset strut mount designs can provide specified caster and camber changes on applicable vehicles, but the correction should always be confirmed for the particular application rather than assumed from another mount.

A professional wheel alignment is required after installation so the resulting geometry can be measured and set correctly.

How Are Strut Mounts Replaced?

Strut mount replacement commonly requires removal of the strut assembly and, where a coil spring surrounds the strut, controlled compression of the spring before the upper mount can be removed. The exact procedure varies with suspension design.

This is not a job where spring tension should be treated casually.

What the Job Involves

A typical replacement may involve:

• Safely raising and supporting the vehicle
• Removing the wheel
• Disconnecting the strut assembly as required
• Removing the strut from the vehicle
• Compressing the coil spring with suitable equipment
• Removing the upper mount
• Inspecting the mount, bearing, spring and surrounding components
• Installing the replacement components
• Reassembling and refitting the strut
• Tightening all fasteners to the manufacturer's specifications
• Checking suspension operation after installation
• Completing a wheel alignment where required

The applicable workshop procedure should always take priority over a generic sequence.

Spring Safety and Wheel Alignment

Coil springs store substantial energy. Incorrectly releasing a loaded spring can cause serious injury.

Use a suitable spring compressor designed for the spring and strut assembly. Never dismantle a loaded strut without correctly controlling the spring, and never work underneath a vehicle supported only by a jack.

If you do not have suitable equipment and experience, have the strut mount replaced by a qualified technician.

A professional wheel alignment should be completed after fitting offset or adjustable mounts and whenever the replacement procedure has disturbed suspension geometry.

Choosing Strut Mounts for Your Vehicle

Choose strut mounts according to the vehicle, suspension position, strut design and purpose of the replacement.

Determine whether you need a standard upper mount, service bushings or a geometry-correcting mount rather than selecting by appearance alone.

Whiteline can assist with fitment if you're unsure which strut top mount suits your suspension setup.

Shop Strut Mounts with Whiteline

Whiteline strut mounts and strut top mounts provide application-specific solutions for suspension mounting, servicing and geometry correction.

Choose the correct fitment with the added confidence of Whiteline's Fitment Guarantee, warranty and 60 Day Returns, with fitment assistance available when you need help identifying the appropriate strut mount for your vehicle.