Trailer Maintenance Tips

 In Trailer Tips

Get the most out of your trailer, ensure it’s functionality and increase its lifetime with these trailer maintenance tips. Depending on trailer type and usage, we generally recommend that routine maintenance is carried out monthly or at least quarterly on standard trailers, and every use for boat trailers.

Frequently Wash It

Keep your trailer clean, especially if you have an enclosed cargo trailer or cabin trailer which has much more surface area than standard trailers. You should wash these trailers with warm soapy water, then rinse off with a hose. Be sure to spend time cleaning the reflective plates and lights, as well as all the nooks and crannies where grime can build up. Don’t forget to rinse off the undercarriage, as road dust can accumulate and degrade moving parts. Some cabin trailers can be quite tall. There are plenty of tools to help you get every square inch of that trailer clean. Telescoping wash brushes and chamois can make your life a lot easier. Or you can opt for a sturdy, non-slip step ladder with good tread on each step.

If you have a boat trailer, you must wash it after every use, especially if you use it around salt water. Saltwater can accelerate corrosion, so be sure to pay extra attention to the wheels, suspension and brakes. Saltwater can collect on these parts and evaporate, leaving a salt residue that can wreak havoc on metal.

Treat Rust

A good quality trailer that is well maintained should not rust! However, it is still a good idea to keep your eye out if you have for rusted parts and areas as you wash. Sand away any patches you find with sandpaper or steel wool. After the trailer has dried, touch up the areas with rust-proof paint. Once the paint dries, apply a healthy coat of wax on your trailer’s painted metal parts. You should do this even if your trailer did not require any touching-up. Keeping your trailer waxed sounds a bit over the top, but it protects metal parts from the elements and prevents rusting.


Keeping your trailer brakes in top working order should always be a priority. In a nutshell, you have three types of trailers as far as trailer brakes go.

  1. Un-braked, which is pretty self-explanatory.
  2. Over-ride brakes, which is the system where the tow coupling slides inside the hitch to operate either a mechanical or hydraulic system to apply the brakes.
  3. Electric over hydraulic setup, where an electronic control module applies power to a hydraulic brake actuator. Electric over hydraulic systems also have an in-car controller. This allows the trailer brakes to be operated independently of the car brakes.
Lubricate Sliding Hitch Actuator:

With over ride brakes, everything is pretty simple. Whether they are cable or hydraulic, there are a few things you need to do to ensure they stay in good working order. The first and easiest part is keeping the sliding hitch actuator lubricated. This is done by simply pumping grease into the grease nipple on the side of the hitch receiver. Doing this once or twice a year is probably adequate. Check the actuator regularly and if it is looking a bit dry, be sure to add some more grease.

Check & Lubricate Brake Lock Tab

The next thing to check is the brake lock tab. When reversing up a hill or over rough ground or a kerb, the brake lock tab flips over to render the brakes inoperative so that the reversing can be carried out easily. Without the brake lock tab, the rearward motion would cause the sliding hitch to apply the brakes. The brake lock tab can easily become corroded and seize in the ‘brakes off’ position, so to avoid this dangerous situation, simply lubricate the brake lock tab regularly with a lubricant such as CRC.

Brake Callipers & Brake Pads

Located at the wheel end of these systems is either a hydraulic brake calliper or a lever and cable system attached to the brake calliper. Inside the brake calliper, whether hydraulic or cable, there should be brake pads. Trailer brake pads are cheap and relatively easy to replace so keep an eye on them and be sure they are in good shape. If in doubt just replace them.

The other issue that can arise in infrequently used trailers is the calipers seizing. This is probably a bit more common in the hydraulic type but will also happen to cable types as well. If you are checking your callipers regularly and find the problem early enough, simply pulling the caliper off, working the hydraulic piston in and out with a G clamp and applying the brakes can quite often get the brakes working again. Applying CRC Penetrate and letting it sit for a day or two may also help in getting the piston moving again. Unfortunately, unless you discover this issue early, more often than not the only remedy is to replace the caliper.

Adjust Cable

If you have a cable activated override brake system, keep in mind that the cable will need to be adjusted occasionally. This can be due to a bit of stretch in the cable and also due to the brake pads wearing down. On some occasions you may also find it necessary to slacken the cable slightly after replacing the brake pads.

Break Fluid

With hydraulic systems, bear in mind that brake fluid does not last forever. Brake fluid by nature absorbs moisture which reduces its ability to do its job, so it is important to bleed and replace hydraulic brake fluid yearly.

Test Breakaway System

It is also a good idea to test the breakaway system on a semi regular basis. Electric over hydraulic brakes should always be operable whenever you are driving. Towing a load that is heavier than your car without brakes is very dangerous. If you are unsure of how to service your own brakes, it’s better and safer to give the job to a professional.

Keep Trailer Parts Greased

Dirt is your trailer’s biggest enemy. Once particles of dirt and dust get into your trailer’s moving parts, it can cause friction and break down. Keeping your trailer’s parts greased can help keep joints and axles moving smoothly. Pretty much any part of your trailer that’s designed to move in some form or fashion or comes in contact with other parts should be kept lubricated to prevent corrosion and friction.

In addition to the breaking parts mentioned above, features like a winch, ball hitch, springs and tongue jack all require lubrication and you should keep them greased throughout the year. It’s a good idea to make lubricating your trailer’s moving parts an important part of your routine before each long trip. One of the most important parts to lubricate are the wheel bearings which we explain further below.

Trailer Wheel and Tire Maintenance:

The wheels on your trailer are connected to the axle by means of the wheel hub. Since the wheels are extremely important to your trailer’s ability to function properly. It’s a fairly straightforward procedure to pull the hub apart and check on it as part of your regular trailer maintenance.

First, you will need to jack up the trailer and remove the wheel. Remember that when the trailer’s wheels are off the ground it’s potentially unstable, so make sure you always work well back from it and no part of your body is underneath it at any time. 

Maintaining the Bearings

The cylindrical rings that connect the wheel to the axle and allow for the wheel’s free rotation. Since the wheels are extremely important to your trailer’s ability to function properly, it’s important to maintain your wheel bearings. Bearings are made up of two parts – the ‘cup’, which is pressed into the hub and the ‘cone’, which contains the rollers. Since the wheel bearings and axles are a metal-on-metal combination, it’s important to keep them well greased to prevent friction, protect them from heat caused by friction. protect them from heat caused by friction and avert potential wheel damage. The wheel bearings are packed with inner bearings that allow the wheel bearings to move as a whole. Part of any trailer maintenance should include cleaning and greasing the wheel bearings for each wheel.

You will find your wheel bearing on the wheel hub, and it should be easily removed after removing the hardware holding it in place. Wipe down the bearings and check they don’t have any nicks, dents or discoloration. If they need to be replaced, they should always be replaced in a set with cup and cone together and be matched to the load rating of the trailer. If they are ok, you will want to soak the wheel bearing in gasoline to loosen grime and old grease. Remove the old seal, then the inner bearing. Thoroughly clean the inner bearing and the wheel bearing as a whole. After the parts are completely dry, replace the inner bearing and seal the wheel bearing. Gently add grease to prevent breaking the seal, and wipe off any excess grease. Now’s also a good time to grease the axle. After you reinstall the wheel bearings and the wheel, move on to the next one.

The Seal

Check that the rubber on the seal is still flexible and in good shape, because if it’s not it will not work well. If it needs replacing, make sure you take note of the number stamped on it, so you will know what to get.

After the parts are completely dry, replace the inner bearing and seal the wheel bearing. Gently add grease to prevent breaking the seal, and wipe off any excess grease. Now’s also a good time to grease the axle. After you reinstall the wheel bearings and the wheel, move on to the next one.

The Race

Run your fingers round the race to check for scratches and note any discoloration. Like the other parts, write down its number so it can be replaced.

Maintaining The Tires

In many cases, especially with large trailers, the added weight the tires support even when stationary can cause trailer tires to wear out significantly faster than the tires on your coach vehicle. If your trailer’s been sitting around unused for a while, it’s a good bet the tires could be deflating. All tires leak air over time, and so keeping an eye on your air pressure is essential to keeping your trailer properly maintained. Taking a trailer fully loaded out on the open road with under-inflated tires can be extremely dangerous. The friction created when the rubber meets the road can also ruin your tires. This situation can lead to a blowout, which is the last thing you want to happen to a trailer hitched to your car and travelling at high speeds.  Before inflating your tires, check the manufacturer’s suggested pounds per square inch (psi) of inflation.

Before every trip, check your trailer tires for wear. It’s recommended that you replace your trailer tires every three to five years. When replacing tires, make sure the ones you purchase match the ones you already have, if you are not buying a complete set. It’s a good idea to shell out the extra cash to replace all of your trailer tires at once, as even good tires are worn to some extent and the addition of a new, unworn tire can lead to handling difficulty when towing. Some manufacturers make tires that are specially designed for trailers.

When you store your trailer, cover the tires to protect them against sun damage, which can cause cracking and splitting.

Trailer Light Systems:

Have you ever driven down a dark highway and passed another vehicle that did not have its lights on? Chances are, you thought the other driver was a jerk, and you were right. It’s a bad idea across the board to drive with your lights off or out of order. Keeping your trailer properly maintained entails keeping your trailer’s lights in proper working order. This is especially important, as most states require trailers have functioning brake and tail lights, as well as turn signals and license plate lights. The wiring for all of these lights should be placed together as part of your trailer’s lighting system. In most cases, all wires converge at a central plug that connects to a wiring socket powered by your coach vehicle. When maintaining you trailer, take some time to follow the wires on both your trailer and your vehicle to ensure the wiring insulation is in good shape. Keep an eye out for corroded, worn or cracked spots. If you come across any weak points in the wiring, wrap it several times with electrical tape to insulate it. While your vehicle’s engine is turned off (and your lights in the “off” position for good measure), you must clean off your electrical connectors. Get rid of any road grime or other type of build-up. Once clean, dab on a little bit of  dielectric waterproof grease – this type will not conduct electricity and keeps moisture out of your electrical connections. You can also dab this type of grease around light bulb sockets and other places where moisture can get into your electrical system.

You must test your lights in practice before heading on the road. This can be a bit tricky with just one person, so grab a buddy, neighbour or family member. Test each of the lights in the system, one at a time and visually confirm they are functioning properly. Start with the tail lights and license plate lights. Next, test the turn signals, and finally the brake lights. Replace any bulbs that may have burned out and address any larger electrical problems before taking your trailer out on the road.


When storing your trailer outside always have the front of it raised so as to allow any water to run out. Jockey wheels are good for this also. This ensures that water does not get trapped in any tight small spots where it can pool and potentially erode the trailer. If possible, cover the trailer in a tarp, particularly the wheels and plastic light covers, to avoid sun damage.

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