Learn How to Adjust Brakes on Your Enclosed Trailer Safely

Neighbors Trailer

Dec 6, 2023
522
8 min read
Enclosed Trailer Renta

An enclosed trailer is only as safe as its brakes. Whether you tow a single axle utility model on weekend errands or run a tandem axle cargo trailer for a small business, the brake system needs regular attention. Adjusting the brakes is one of the most overlooked maintenance tasks among trailer owners, yet it has the biggest payoff in stopping distance, tire wear, and overall driving confidence. This guide walks you through the entire adjustment process for both electric and hydraulic surge systems on enclosed trailers.

Why Brake Adjustment Matters on an Enclosed Trailer

Enclosed trailers carry tools, motorcycles, landscaping equipment, or full household goods, and that load shifts the dynamics of every stop. Unlike open utility trailers, enclosed bodies catch wind and ride higher, which puts more demand on the trailer brakes when you slow down at highway speed or descend a long grade. Properly adjusted brakes share the load evenly across both axles and prevent the tow vehicle from doing all the work.

Loose, dragging, or unevenly worn shoes are the three most common adjustment problems. Loose shoes mean longer stops and more heat. Dragging shoes burn fuel and overheat drums. Uneven wear shortens the life of the friction material and pulls the trailer to one side under braking. Adjusting the brakes once or twice a season corrects these issues before they cause damage.

Electric Brakes vs Hydraulic Surge Brakes

Most modern enclosed trailers use one of two systems, and the adjustment procedure is different for each. Electric brakes use a magnet inside each drum that energizes when the tow vehicle's brake controller sends a signal. Hydraulic surge brakes use the trailer's forward push against the hitch to compress an actuator and send fluid pressure to the wheel cylinders. Both systems still rely on a star wheel adjuster, brake shoes, and a drum, so the mechanical adjustment is similar, but the prep work and testing steps differ.

Quick Reference: Adjustment Frequency by Use

Usage Pattern	Recommended Adjustment Interval	Typical Symptom Trigger
Light personal use (under 3,000 miles per year)	Once per year or every 12 months	Soft pedal, weak grab
Moderate use (3,000 to 10,000 miles per year)	Every 6 months	Pulling under braking, slight squeal
Heavy or commercial use (over 10,000 miles per year)	Every 3 months	Drum heat, increased stopping distance
After any wheel service, repack, or seal replacement	Immediately before re-mounting	None - preventive
After driving through deep water or mud	Inspect within one week	Squealing, dragging, or rust streaks

Tools You Will Need

Most adjustments take less than 30 minutes per wheel with the right tools. A standard brake spoon (sometimes called a brake adjuster tool) is the only specialty item, and you can find one at any auto parts store for under $15. You will also need a jack, jack stands rated for at least the loaded trailer weight, wheel chocks, and a lug wrench.

Step by Step: Adjusting the Brakes

The procedure below applies to both electric and hydraulic drum systems. If your trailer uses disc brakes, the calipers are self-adjusting and you can skip to the inspection section near the end.

Step 1: Park, Chock, and Disable Power

Park on level ground, chock both tires opposite the wheel you will service, and disconnect the breakaway battery so the brakes do not energize unexpectedly. If you are working on a surge brake system, also reverse the trailer slightly to release pressure on the actuator before lifting.

Step 2: Lift One Wheel at a Time

Use the jack to raise just one wheel off the ground. Place a jack stand under the frame and lower the trailer onto it. Never adjust brakes while the wheel rests on the ground because you cannot spin it to feel the shoe contact.

Step 3: Locate the Adjustment Slot

The backing plate has a small oblong slot covered by a rubber plug. Pop the plug out with a flathead screwdriver. Inside you will see the star wheel adjuster, which is a serrated circular gear.

Step 4: Tighten Until the Shoes Drag

Insert the brake spoon into the slot and rotate the star wheel upward (or downward, depending on the side - check the manufacturer diagram). Each click extends the shoes outward. Spin the wheel by hand between clicks. Stop when the wheel will only complete one full rotation under firm hand pressure.

Step 5: Back Off Slightly

Reverse the star wheel six to ten clicks. The wheel should now spin freely with only a faint contact between the shoes and drum. If you hear or feel constant scraping, back off another click or two.

Step 6: Replace the Plug and Repeat

Push the rubber plug back into the slot. Lower the wheel, move to the next wheel in the sequence, and repeat. Always work in this order: rear curb, rear road, front curb, front road. After the last wheel, reconnect the breakaway battery.

How Adjustment Affects Stopping Distance

Adjusted brakes pay back the time you spent in fewer feet of stopping distance. The chart below shows how four real world enclosed trailers performed before and after a routine adjustment, measured at 45 mph on a dry test surface with a 4,500 pound payload.

Bar chart comparing trailer stopping distance before and after brake adjustment

NeighborsTrailer.com

Testing the Adjustment Before Towing

After all four wheels are adjusted, hook up to the tow vehicle and test the brakes in a quiet parking lot. For electric brakes, use the manual override slider on the brake controller and feel for smooth, even braking with no pulling. For surge brakes, drive forward at 5 mph and apply the tow vehicle's brakes firmly. The trailer should decelerate evenly without lurching or one wheel locking before another.

If you notice pulling, retest the adjustment on the side that grabs first by backing off a click or two. If the brakes feel weak across the board, you may have a wiring issue rather than an adjustment issue. Our guide to using a brake controller on an enclosed trailer rental covers gain settings and basic troubleshooting.

Common Mistakes to Avoid

Owners new to brake adjustment often over-tighten the star wheel, which causes the shoes to drag and overheat. Others forget to back off after reaching contact, leading to glazed friction surfaces within a few miles. A third common error is adjusting only one wheel and calling it done. Brakes work as a system, so all four wheels need to be checked together to keep the trailer balanced.

Skipping the manual rotation test is another pitfall. If you do not spin the wheel by hand and feel for drag, you cannot tell whether the shoes have actually contacted the drum. The wheel must spin freely with only the slightest rub when correctly adjusted.

Frequently Asked Questions

How do I know if my enclosed trailer brakes need adjustment?

The classic signs are a soft pedal feel, longer stopping distances, the trailer pulling to one side, or the tow vehicle doing more of the braking than usual. Squealing, smell of hot friction material, or visible drum discoloration also indicate that adjustment is overdue.

Do enclosed trailer brakes adjust themselves?

Some newer drum systems include self-adjusters that engage during reverse braking, but most enclosed trailer brakes are manual. Even self-adjusting systems benefit from an annual manual check.

Can I adjust the brakes with the wheel still on the trailer?

You can, but you must lift the wheel off the ground first so it can rotate freely. Adjusting on a grounded wheel risks setting the shoes too tight because you cannot feel the drag.

What is the difference between adjusting and replacing the shoes?

Adjustment moves the existing shoes closer to the drum to compensate for wear. Replacement is needed when the friction material has worn below the manufacturer's minimum thickness, usually around 1/16 inch.

Should I lubricate anything during the adjustment?

A small dab of high temperature brake grease on the star wheel threads keeps it turning smoothly for the next adjustment. Avoid getting grease on the friction surfaces or the inside of the drum.

Conclusion

Adjusting the brakes on your enclosed trailer is a small investment of time that pays off every time you hit the brake pedal. With basic hand tools and an afternoon, you can shorten stopping distance, even out tire wear, and extend the life of every brake component. Trailer owners who list their cargo trailer on Neighbors Trailer also build trust with renters by maintaining brakes on a regular schedule and keeping the service log updated.

Content updated May 2026