The honest answer to can you drive with a bad strut mount depends on which part of the mount has given up, and nobody asking at the side of the road has been told that. Strut mount, strut top mount, top hat and strut tower mount all mean the same assembly, and it contains two separate things that fail in different ways.

We engineer polyurethane suspension components in Brisbane and test them here, so we see plenty of mounts driven on for months and a few that should have been trailered. Our range of strut mounts exists because the failure is so predictable, and this post should help you work out where on that curve you sit.

Work out what has actually failed first

The bearing lets the strut rotate as you steer on a MacPherson front end. When its grease dries out or water gets in, it goes notchy and noisy. That is a comfort and steering feel problem before it is anything worse.

The bonded rubber element ties the strut rod to the body and carries spring load on most designs. When it hardens, cracks and starts to separate from its steel, the top of the strut stops being a fixed point. That is a geometry and handling problem, and it accelerates once it starts.

Knowing which one you have tells you whether you are booking a job for next week or calling someone now.

The escalation ladder

We use three stages when we talk owners through this.

Stage one, a noisy bearing

You hear a creak, groan or gritty grinding when you turn the wheel at low speed or while parking. The car tracks straight, the tyres look even, and nothing has changed over bumps. Annoying, not immediately unsafe. A notchy bearing can also make the steering catch at certain angles and stop the wheel returning to centre cleanly. Book it in and stay off heavy corrugations.

Stage two, perished rubber with movement

Now you get a dull clunk over bumps that comes from up near the top of the guard rather than down at the wheel. The steering feels vague around centre and the car wanders on a crowned road, and your front tyres may already show a wear band on one shoulder. The strut top is moving under braking and cornering load, so your camber is changing while you drive. This is where the cost stops being the mount and starts being tyres. Drive gently, no towing and no loaded touring.

Stage three, a separated mount

The bond between rubber and steel has let go entirely, or the mount has pulled through its own top plate. The clunk is loud and metallic, it happens on the smallest bumps, and in bad cases the strut rod sits proud or off centre when you open the bonnet. The strut can now move in the tower, steering response becomes unpredictable, and loads that should spread across the mount go into sheet metal that can tear. Stop driving it and have it recovered.

That ladder is not slow. A stage two mount on a loaded ute doing dirt roads can reach stage three in a single trip.

What it is costing you while you wait

Stage	What you feel	Safe to drive?	Cost of delay
Noisy bearing	Creak or grind when parking, steering will not self centre	Yes, short term	Noise worsens, steering feel deteriorates
Perished rubber, movement	Clunk over bumps up near the guard, vague steering	Limited, gently	A pair of front tyres, plus alignment done twice
Separated mount	Loud metallic knock, visible movement at the tower	No	Strut tower damage and a far bigger bill

 

The tyre bill is the one owners underestimate. A front tyre scrubbed on one shoulder is finished long before its tread depth suggests, and tyres go on in pairs.

Will it fail a roadworthy?

Roadworthy and safety certificate requirements are set state by state, so the exact wording differs between Queensland, New South Wales and Victoria. Every state checklist covers suspension components that are loose, damaged, insecure or have excessive free play, and a mount with separated rubber sits squarely in that description. Expect a stage two or stage three mount to be written up, and a notchy bearing to be noted if the inspector can hear it. A badly worn mount can also push your alignment outside the manufacturer's tolerance, which is its own problem.

What the repair costs in Australia

Two Australian sources measure two different jobs here and both are correct. AutoGuru quotes $110 to $320 per mount, which reads as a mount swap done while the strut is already out of the car, for example alongside a strut replacement.

A standalone job is dearer, because the strut has to come out and the spring has to be compressed for the mount alone. Fulcrum Suspensions pricing puts that at $393 to $1,332 fitted depending on whether it is a plain top cap ($95 to $195 in parts), a mount and bearing kit ($165 to $495), or an offset mount that corrects camber and caster ($473 to $854). Add a wheel alignment, which AutoGuru puts at around $70 for a small car and up to $120 for something larger.

Fixing it once

Every hour of that labour is spent getting the strut out and the spring compressed, so what you bolt back in should outlast the car. Our polyurethane resists oil, heat, ozone and UV better than rubber, and it does not delaminate the way a bonded rubber element does, which removes the exact failure that started the noise. It also holds the strut top where the geometry needs it, so your alignment stays where the technician set it, and our polyurethane components carry a lifetime warranty.

Frequently asked questions

Looking for more information about strut mounts? Below we answer the most commonly asked questions

Nobody enjoys paying for a part they cannot see, but this one is a genuine once and done repair when it is built properly. If your car is clunking or creaking, have a look at our range of strut mounts before you buy another set of rubber ones.