10 Products
Your Current Vehicle
Or
Select Your Vehicle
Shop Top Strut Mount & Bearing by Brand
Vehicle Models and Options for Top Strut Mount & Bearing
The top mount completes the strut load path
A strut combines suspension location, spring support and damping in one structural assembly. Wheel loads travel through the hub carrier and strut body, then through the spring seat, bearing or mount and into the reinforced body tower. The mount must control this load while filtering harshness.
At a steered axle, the complete strut turns. A low-friction upper bearing prevents the coil spring from twisting and releasing in steps. Correct assembly order and orientation are essential to both structure and steering feel.
How the assembly works
- The tyre and suspension apply vertical and lateral force to the strut.
- The coil spring carries vehicle weight between lower and upper seats.
- The upper seat transfers spring load through the bearing or mount.
- Bonded rubber isolates high-frequency vibration from the body.
- The damper rod transmits damping force through its centre sleeve.
- On steering axles, the bearing rotates with the strut and spring.
- Studs or bolts secure the load plate to the strut tower.
Common upper-mount arrangements
| Arrangement | Construction | Service implication |
|---|---|---|
| Integrated mount and bearing | Bearing is built into the bonded upper mount. | Complete assembly is renewed together. |
| Separate bearing and mount | Plastic/steel bearing sits between spring seat and mount. | Order and orientation of both pieces matter. |
| Upper spring seat with bearing | Seat, isolator and bearing form a layered stack. | Spring-end position and isolator tabs must align. |
| Rear non-steering mount | Rubber/metal mount carries damper or coil-over load without steering bearing. | Do not assume a bearing is required. |
| Camber-adjustable mount | Specialised plate changes damper-rod position. | Modification needs geometry setup and approval. |
| Adaptive-strut mount | Mount accommodates electrical lead, actuator or unique shaft. | Connector routing and suspension option are critical. |
Components in the stack
Bonded rubber mount
Rubber bonded to steel permits controlled movement while isolating noise. Age, oil, ozone and overload cause cracking or separation. A small moulding line is not the same as a tear through the working section.
Thrust bearing
Ball, roller or low-friction sliding elements carry axial spring load during rotation. Seals retain grease and exclude water. Corrosion, broken races or contamination create notchiness and spring wind-up.
Upper spring seat and isolator
The shaped seat supports the coil end at a defined stop. A rubber isolator prevents metal contact and noise. Incorrect rotation can bow the spring or place its end against the body.
Damper-rod sleeve and washer stack
The centre sleeve clamps to the rod through specified washers and spacers. Missing or inverted cupped washers can cut rubber, restrict movement or leave the rod loose.
Body fasteners
Studs, flange nuts or stretch bolts secure the mount. Their grade, prevailing torque and single-use status are structural requirements, not generic hardware choices.
Fitment evidence
| Check | Possible variation | Why it matters |
|---|---|---|
| Axle and side | Front/rear and left/right offset. | Stud pattern and geometry can be handed. |
| Suspension option | Standard, sport, heavy-duty or adaptive. | Mount height, stiffness and shaft differ. |
| Body/engine | Vehicle mass and tower package. | Load rating and clearance change. |
| Build date | Bearing, seat or mounting revision. | Similar components may not stack correctly. |
| Stud/bolt pattern | Number, spacing and orientation. | Defines body attachment and index. |
| Spring dimensions | Coil diameter and end shape. | Upper seat must support it fully. |
| Damper rod | Diameter, thread, flats and actuator. | Centre sleeve and nut must match. |
| Kit contents | Mount, bearing, seat, fasteners or isolator. | Prevents omission or duplicate stacking. |
Bearing friction and spring wind-up
When the steering turns, the upper bearing should let the strut rotate smoothly under spring load. If it binds, the lower seat rotates while the top of the spring resists. Torsion builds until friction is overcome, producing a twang, knock or stepped steering return.
A bearing that feels smooth in the hand can fail under the vehicle's axial load. Loaded steering observation, spring movement and noise localisation provide stronger evidence. Keep clear because a suddenly releasing spring can move sharply.
Tyre scrub, steering-column joints, ball joints and power-steering faults can also create notchy feel. Diagnose the whole steering path rather than replacing the mount from noise alone.
Mount compliance and alignment
The mount permits designed angular movement as the suspension travels. Excessive rubber collapse changes strut position and can influence camber, caster and ride height. A small visible movement during steering may be normal; compare with specifications and the opposite side.
Some mount studs are deliberately offset and have an arrow or notch pointing forward, outboard or to a body mark. Rotating the plate changes geometry. Adjustable aftermarket plates make this intentional but require measurement and secure locking.
Fault evidence
| Symptom | Possible mount/bearing cause | Other checks |
|---|---|---|
| Clunk over sharp bumps | Separated rubber, loose sleeve or mount fastener. | Drop links, ball joints, damper and spring. |
| Creak while steering stationary | Dry/binding bearing or isolator movement. | Ball joint, track-rod end and steering column. |
| Spring twang | Bearing bind or incorrect spring seating. | Broken coil and lower seat condition. |
| Heavy/notchy steering | Collapsed bearing or misassembled stack. | Power steering, joints, tyres and alignment. |
| Centre rod appears raised | Rubber separation, wrong washer or loose nut. | Stop and assess structural security. |
| Uneven ride height | Collapsed mount or wrong component height. | Spring breakage, load and damper seating. |
| Noise after strut work | Wrong orientation, fastener torque or omitted part. | Review complete assembly sequence. |
Inspection sequence
- Confirm noise conditions, steering position and road input.
- Inspect tower studs, centre sleeve and visible rubber with the vehicle supported.
- Observe spring and strut rotation while an assistant steers safely.
- Compare left and right movement without placing hands near the spring.
- Raise the vehicle correctly and inspect spring, damper and suspension joints.
- Check bearing play and roughness after strut removal and safe compression.
- Inspect upper and lower seats, isolators, bump stop and dust boot.
- Review alignment and previous part orientation.
Stored spring energy
A compressed road spring contains enough energy to cause fatal injury. Use a compressor rated for the spring size and shape, with secure opposed jaws, safety restraints and undamaged threads. Cheap, mismatched or poorly positioned hooks can slip.
Compress evenly until the spring is loose between both seats. Never point the strut ends towards a person, lean over the assembly or use an impact tool unless the equipment maker expressly allows it. Keep the centre nut installed until spring load is completely controlled.
Conical, barrel and side-load springs may require dedicated compressors. If access or tooling is unsuitable, use a professional workshop or a pre-assembled complete strut where an appropriate verified part exists.
Removal from the vehicle
Record ride height, steering position and any electronic-damper faults. Secure the vehicle and support the hub so hoses, driveshafts and sensor leads are not stretched. Mark camber-sensitive bolts only as a reference; marks do not replace alignment.
Release brake-hose and wheel-speed cable brackets before removing strut-to-hub fasteners. Hold the strut as the top nuts are removed. Do not loosen the damper-rod centre nut while the spring remains loaded in the vehicle unless the specific design and procedure explicitly requires it.
Bench assembly
- Clean the strut exterior and mount it in a safe support.
- Install the spring compressor and capture several sound coils per instruction.
- Compress evenly until both spring seats are unloaded.
- Hold the damper rod with the specified tool and remove the centre nut.
- Record every washer, sleeve, bearing and isolator orientation.
- Inspect spring ends, damper rod, bump stop and seats.
- Build with the correct new mount/bearing and specified fasteners.
- Torque the centre nut without gripping the polished rod.
- Align spring ends and mount marks before slowly releasing compression.
Never grip a damper rod with locking pliers; surface damage cuts the rod seal. An impact wrench can spin internal damper parts or hide incorrect torque. Use the proper pass-through socket and rod-holding tool.
Installation, torque and alignment
Position mount orientation marks correctly and start body nuts by hand. Fit the lower connection and all brackets without twisting brake hoses. Replace stretch bolts, prevailing-torque nuts and corroded fasteners as specified.
Some suspension bushes and fasteners require final tightening at normal ride height. Strut-to-hub bolts can directly control camber. Once both sides are assembled, settle the suspension, check ride height and carry out four-wheel geometry measurement as required.
Verify steering turns smoothly from lock to lock, spring position remains stable and no wiring contacts the tyre or spring. Road-test for noise and steering return, then recheck visible fasteners where the procedure specifies.
Replacement strategy and upgrades
Mounts and bearings share age and mileage across an axle, so paired replacement can provide consistent height, friction and isolation. This does not mean discarding a serviceable opposite component without assessment, but combining mount renewal with strut and spring work often avoids repeated labour.
Stiffer or solid top mounts sharpen response but transmit noise and impact into the body. Adjustable camber plates can reduce rubber compliance and change load paths. Use road-approved engineered parts, set geometry professionally and disclose material suspension modifications to the insurer.
Common mistakes
- Replacing a mount without confirming whether the bearing is separate.
- Ordering by appearance without suspension option and side.
- Removing the centre nut before safely compressing the spring.
- Using undersized, damaged or badly positioned compressor hooks.
- Mixing washer, isolator and bearing order.
- Installing an offset mount without its orientation marks aligned.
- Gripping the polished damper rod with pliers.
- Reusing specified one-time strut or hub fasteners.
- Allowing brake hoses or wheel-speed wires to hang from the strut.
- Skipping wheel alignment after geometry disturbance.
UK MOT and suspension safety
Suspension mountings, springs, struts and steering operation are assessed under current MOT requirements. Excessive wear, insecurity, serious deterioration, binding or a fractured component can lead to failure. The precise result depends on the condition presented and official inspection criteria.
Do not drive with a loose centre sleeve, separated mount, broken spring, severe steering bind or insecure strut. The mount is structural and failure can change wheel control. Spring compression and alignment work should be completed only by a competent person with rated equipment.
Top strut mount and bearing FAQs
Q: What does a top strut mount do?
A: It attaches the strut to the body, carries load and isolates vibration.
Q: Why is a bearing fitted at the top?
A: It lets the front strut and spring rotate smoothly with steering.
Q: Does every top mount include a bearing?
A: No. The bearing may be separate or absent on non-steering applications.
Q: What causes a spring twang while steering?
A: A binding bearing or incorrectly seated spring can store and release twist.
Q: Should mounts be replaced in pairs?
A: Pair replacement can preserve consistent height and steering friction across an axle.
Q: Can the centre nut be removed on the vehicle?
A: Never unless the exact procedure safely controls all spring load.
Q: Can ordinary spring compressors be used?
A: Only rated equipment that securely matches the spring shape is acceptable.
Q: Why does a new mount still creak?
A: Check assembly order, orientation, spring seating and other steering joints.
Q: Are left and right mounts identical?
A: Not always; offset, studs and index marks can be handed.
Q: Must the damper be replaced with the mount?
A: Not automatically, but inspect it while the strut is dismantled.
Q: Is wheel alignment required?
A: Yes where strut removal or mount orientation affects geometry.
Q: Can a top mount change ride height?
A: A collapsed or wrong-height mount can alter the body-to-strut position.
Q: Can a worn mount fail the MOT?
A: Yes where wear, deterioration, binding or insecurity meets current criteria.
