If you run trucks or heavy equipment, you already know how important a roadworthy inspection is—but what actually causes most vehicles to fail?
At Maude Diesel Service, we regularly carry out roadworthy inspections and pre-checks, and the reality is this: most failures come down to a handful of preventable issues—many of which are often overlooked.
The Most Common Roadworthy Failures We See
Over time, wear and tear is unavoidable—but these are the areas that most often catch operators out:
1. Braking Systems
Worn brake components, air leaks, or uneven braking performance are one of the biggest reasons vehicles fail. Even a small issue can put your truck off the road.
2. Suspension & Steering Components
Worn bushes, excessive play, or loose components can all lead to non-compliance—and they’re often not noticeable until inspected.
3. Oil Leaks
What might seem like a minor leak can result in an instant fail. These are commonly ignored but easily avoided with routine servicing.
4. Lights & Electrical
Faulty indicators, brake lights, or wiring issues are a simple but very common reason for failure.
5. Tyres
Low tread, uneven wear, or damage will quickly fail a roadworthy inspection.
The Often Overlooked (But Just as Important) Items
It’s not just mechanical issues—cosmetic and compliance-related items can also cause a fail:
- Missing or damaged reflectors
- Incorrect or faded Class 1 rear signage
- Unserviceable (U/S) windscreens – including chips, cracks, or sandblasted glass that reduces visibility
- General visibility and safety markings not up to standard
These are the types of things that catch people out because the truck might still “feel” fine to drive—but it won’t pass inspection.
A Recent Example from Our Workshop
We recently had a truck come in for a roadworthy that the owner believed was in solid condition.
After inspection, we found:
- A minor air leak in the braking system
- Worn suspension bushes
- Oil seepage from the engine
- Faded rear signage
- A sandblasted windscreen affecting visibility
Individually, none of these seemed major—but together, they resulted in a failed inspection.
The good news? Because it came through us early, we were able to carry out the repairs and replacements quickly and get the truck compliant without major downtime.
Why a Pre-Inspection Makes All the Difference
One of the best ways to avoid failing a roadworthy is to book a pre-inspection.
This allows us to:
- Identify both mechanical and cosmetic compliance issues
- Fix problems before the official inspection
- Save time, stress, and repeat inspection costs
Stay Ahead of Compliance
Roadworthy compliance isn’t just about ticking a box—it’s about keeping your truck safe, legal, and on the road.
Often, it’s the small details—not just the big mechanical issues—that determine whether you pass or fail.
How Maude Diesel Service Can Help
We offer:
- Roadworthy inspections
- Pre-roadworthy checks
- Full diagnostics and repairs
- On-site and workshop servicing
From brake systems to signage and everything in between—we make sure nothing gets missed.
Need to book in?
If your roadworthy is coming up, don’t leave it to chance.
A quick check now can save you time, money, and downtime later.
Get in touch with Maude Diesel Service today and we’ll make sure your vehicle is ready to pass the first time.
