A tailgate that will not stay up is more than an everyday annoyance. It can turn loading groceries, prams, tools or sports gear into a safety risk in seconds. Knowing the top signs gas struts fail helps you act before a heavy boot, bonnet or hatch drops unexpectedly – and before a simple replacement becomes an inconvenient problem.
Gas struts are designed to make opening and holding heavy panels feel easy. They are fitted to many vehicle boots, tailgates, bonnets, canopies and rear windows, but their performance gradually declines with age, use and exposure to Australian conditions. Here are the signs worth watching for.
Top Signs Gas Struts Fail or Are Losing Strength
Your boot, bonnet or tailgate will not stay open
This is the clearest sign of failing gas struts. If the panel slowly sinks after you lift it, needs a prop to remain open or falls without warning, the struts no longer have enough pressure to support its weight.
Do not assume it is safe because it only drops a little at first. A weakened strut can lose its remaining pressure quickly, particularly on a hot day or when the vehicle is parked on an incline. A falling tailgate or bonnet can cause injury and may damage the panel, hinges or surrounding trim.
You need to lift much more of the weight yourself
Healthy gas struts assist with the lift from the moment you begin opening the panel. When they are worn, the boot, hatch or bonnet may feel unusually heavy, especially through the first half of its travel.
You might still be able to open it, but it should not require a sudden heave or a second hand to get it up. This is especially noticeable on SUVs, wagons, vans and utes with larger tailgates. The heavier the panel, the less margin there is when the gas struts begin to weaken.
The panel rises slowly or stops before it is fully open
Some gas struts are intended to help a panel lift once it has been started. If your hatch opens sluggishly, pauses halfway or no longer reaches its normal height, reduced gas pressure is a likely cause.
Check the vehicle is parked on level ground before making a judgement, as gravity can affect the way a tailgate moves. However, if the issue happens repeatedly in different locations, it is time to have the struts assessed. A hatch that does not open fully can be awkward for taller drivers and may limit safe access to the cargo area.
Opening performance changes with the temperature
Gas struts can feel weaker in cold weather because the gas pressure inside changes with temperature. A small difference on a chilly morning does not automatically mean replacement is needed.
The concern is when your struts struggle in normal conditions, then become noticeably worse during cooler weather. Likewise, struts that have been weakened by age may fail after prolonged heat exposure. Australia’s sun, heat and wide seasonal temperature changes can all speed up wear, particularly for vehicles parked outdoors.
You can see oil, corrosion or damage on the strut
A gas strut has a sealed cylinder and a polished rod. Oil residue around the seal, visible dents in the cylinder, rust, corrosion or a scratched rod can indicate that the unit has been compromised.
A damaged strut may still appear to work for a while, but its performance can be unpredictable. Do not try to lubricate the shaft with general-purpose sprays in the hope of restoring lifting force. Gas struts are sealed components, and lubrication will not replace lost internal pressure. It can also attract dirt that damages the seal further.
The struts make noises or the panel moves unevenly
Gas struts should operate quietly and smoothly. Squeaking, clicking, binding or jerky movement may point to worn mounting points, dry hinges, misalignment or a strut that is beginning to fail.
Not every noise comes from the strut itself. A bonnet hinge or tailgate latch can also create movement issues, so a proper inspection is worthwhile. If one side of a hatch seems to rise or lower differently from the other, avoid forcing it. Uneven movement can place extra stress on the hinges and bodywork.
Why Gas Struts Wear Out
Gas struts are wear items. Their internal seals slowly deteriorate, allowing pressurised gas to escape over time. Frequent use, age, dust, moisture and heat all play a part.
A vehicle used for family duties or work may open its tailgate many times a day. Canopy and tonneau struts on a ute can be exposed to rain, road dust and intense sunlight. Even a lightly used car is not immune, as seals can harden with age. There is no single replacement interval that suits every vehicle – condition and performance matter more than the calendar.
Struts can also wear out sooner if the panel is overloaded. Accessories such as rear spoilers, bike-rack fittings, aftermarket storage systems or heavier canopy doors can add weight beyond what the original struts were designed to hold. In these cases, the correct replacement specification is essential.
Do Not Rely on a Makeshift Prop
A broom handle, piece of timber or improvised stick may seem like a temporary fix, but it is not a reliable one. It can slip on uneven ground, move when the vehicle is bumped or fall away while someone is reaching into the boot.
Take extra care around children and when unloading heavy items. If a bonnet will not remain open, avoid working underneath it until it is properly supported and the struts are replaced. For larger tailgates and canopy doors, arranging replacement promptly is the safer and more practical choice.
Choosing the Right Replacement Gas Struts
Gas struts are not one-size-fits-all. The correct option depends on the vehicle make and model, the mounting fittings, open and closed length, stroke length, and required lifting force. A strut that is too weak will not hold the panel up. One with excessive force can make closing difficult and may place unnecessary strain on hinges or mounting points.
As a general rule, replace struts in pairs where a panel uses two. If one has lost pressure, the other is often close behind. Replacing both helps the panel lift evenly and reduces the risk of mismatched support.
Professional fitting also helps ensure the new struts are installed in the correct orientation and that the clips, brackets and mount points are secure. This matters most with heavy boots, bonnets and tailgates, where a loose fitting can create another safety concern.
Convenient Gas Strut Replacement for Australian Drivers
A failing strut does not need to mean rearranging your week around a workshop visit. Mobile replacement can be a practical option for busy families, professionals and tradespeople who need their vehicle functioning properly at home or work.
VIP Car Care provides professional gas strut replacement with trained owner-operators who understand the importance of safe, dependable vehicle access. Whether it is a tired boot strut, a weak bonnet support or a tailgate that will not stay up, fitting the right replacement can restore everyday convenience without the premium price barrier.
If your boot, bonnet or tailgate is getting heavier, slower or less reliable, trust what your vehicle is telling you. Replacing worn gas struts early keeps routine jobs simple and helps prevent an unexpected drop when you least need one.
