Wiktor Wise
Dexter Nev-R-Adjust Electric Trailer Brakes are designed to operate at high temperatures, but sometimes they need to be adjusted to compensate for lining and drum wear. This can be done manually, by raising the trailer and checking that the wheel and drum rotate freely, then removing the adjusting hole cover from the slot on the bottom of the assembly's backing plate. Next, use an adjusting tool to rotate the starwheel of the adjuster assembly to expand the brake shoes. Adjust the brake shoes until the pressure of the linings against the drum makes the wheel difficult to turn. Finally, rotate the starwheel in the opposite direction until the wheel turns freely with only a slight drag. Alternatively, you can use a forward self-adjust brake.
| Characteristics | Values |
|---|---|
| Dexter brake type | Electric |
| Dexter brake model | Nev-R-Adjust |
| Dexter axle weight | 7,000 lbs |
| Dexter axle type | Torsion tandem |
| Brake adjustment type | Manual |
| Adjustment steps | Raise the trailer, check wheel and drum rotate freely, remove the adjusting hole cover, rotate the starwheel of the adjuster assembly to expand the brake shoes, adjust the brake shoes until the pressure of the linings against the drum makes the wheel difficult to turn, rotate the starwheel in the opposite direction until the wheel turns freely with only a slight drag |
| Troubleshooting | Check the screw and brake pads, ensure the plug and socket connections are not corroded, check the shoes for wear and tear, check for electrical problems |
| Kits | Kodiak Disc Brake Kit, HydraStar Disc Brake Kit, #AKEBRK-35L-SA Self Adjusting brake assemblies |
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What You'll Learn
Troubleshooting Dexter Nev-R-Adjust Electric Trailer Brakes
If adjusting the starwheel does not improve braking power, you may need to check the shape of the brake shoes. Remove the drums and inspect the shoes, ensuring they are the proper shape (round or half-moon) and match the shape of the drum. Worn or misshapen brake shoes can cause reduced contact with the drum, leading to decreased braking power. It is important to note that the brake pad material does not need to be completely worn out for the shoes to require replacement.
Additionally, electrical issues could be the cause of inconsistent brake performance. If your brakes sometimes work fine and sometimes don't, the problem is likely electrical. Check for corrosion in the plug and socket connections. You can use a test light or a voltmeter to test both the plug and receptacle. If the connections are not the issue, you may need to inspect other components such as the controller, magnets, or individual parts.
When troubleshooting Dexter Nev-R-Adjust Electric Trailer Brakes, it is important to refer to the official instructions or seek professional assistance if you are unsure about any steps or procedures.
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Adjusting the starwheel
First, you need to raise the trailer and ensure that the wheel and drum can rotate freely. This is an essential safety check to perform before making any adjustments. Once you've confirmed free rotation, locate the adjusting hole cover on the bottom of the assembly's backing plate and remove this cover to access the starwheel adjuster.
With an adjusting tool, you can now begin to adjust the starwheel. Rotate the starwheel to expand the brake shoes. You will need to adjust the brake shoes until there is significant pressure between the linings and the drum, making the wheel hard to turn. This step ensures maximum braking power.
However, you must then back off this adjustment slightly. Rotate the starwheel in the opposite direction until the wheel turns freely again, but with a slight drag. This drag indicates that the brake shoes are still making contact with the drum, providing braking power, but without impeding the free rotation of the wheel.
It is important to note that if you are unable to achieve sufficient braking power through this adjustment, you may need to inspect the brake shoes and drums for wear and tear. Sometimes, the brake shoes may lose their proper shape, reducing their contact with the drum and, consequently, the braking power. In such cases, you may need to replace the brake shoes or drums or consult a professional for further advice.
Additionally, if your Dexter brakes are self-adjusting or automatic, you may need to refer to the OPERATION MAINTENANCE SERVICE MANUAL for specific instructions. Some Dexter brakes are designed to self-adjust as you drive, and manual adjustments may not be necessary or recommended. Always consult the appropriate manuals and resources before attempting any adjustments or repairs.
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Checking for electrical issues
If you are experiencing issues with your Dexter 7 electric brakes, it is important to check for any electrical problems. Here are some detailed steps to help you identify and address potential electrical issues:
Step 1: Understand the Basics: Start by understanding the electrical components of your Dexter 7 electric brakes. This includes the brake controller, which regulates the voltage supplied to the brakes, and the brake magnets, which play a crucial role in brake activation.
Step 2: Inspect Connections: Begin your inspection by checking the connections for any signs of corrosion or damage. Ensure that the plug and socket are in good condition and securely connected. Corrosion or loose connections can lead to electrical issues and impact brake performance.
Step 3: Test Voltage: Use a voltmeter to test the voltage at the brake connector. The engine of the towing vehicle should be running during this test. Ensure that the voltage supplied to the brakes is within the appropriate range. Refer to your Dexter 7 electric brake manual for specific voltage requirements.
Step 4: Check Brake Magnets: If your Dexter 7 electric brakes are not engaging properly, the issue could be with the brake magnets. Use a multimeter to test the magnets for continuity. You should also listen for the characteristic hum produced by functioning brake magnets. If the magnets are not functioning properly, they may need to be replaced.
Step 5: Address Wiring Issues: If you suspect a wiring issue, carefully inspect the brake wiring for any signs of damage or short circuits. Ensure that the wiring is securely connected and free from corrosion. Refer to the wiring diagram in your Dexter 7 manual to identify the correct wiring configuration.
Step 6: Refer to the Manual: Always refer to the Dexter Service Manual for detailed troubleshooting instructions. The manual will provide specific steps for identifying and resolving electrical issues related to your Dexter 7 electric brakes. It is important to follow the manufacturer's recommendations for optimal brake performance and safety.
Remember, electrical issues can be complex, and it is always recommended to seek professional assistance if you are unsure about any aspect of the troubleshooting process. Safety should be the top priority when working with electric brake systems.
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Replacing brake assemblies
Dexter Nev-R-Adjust Electric Trailer Brake Assemblies are available for purchase. These are self-adjusting and do not require manual adjustment. They are compatible with 3,500 lb axles and square 4-bolt brake mounting flanges. The Dexter Nev-R-Adjust kit contains both the left and right brake assemblies.
If you are looking to replace the entire hub and drum, you can purchase the Dexter Trailer Hub and Drum Assembly for 3,500-lb Axles. This assembly is compatible with electric or hydraulic brakes and fits 7,000-lb axles.
For those with a 2,000-lb axle, the Dexter 7-inch Electric Brakes are compatible with 2K Dexter E-Z Lube and etrailer Easy Grease axles. This hub-and-drum assembly provides a surface area for brake shoes to grip when the brake is activated.
When replacing brake assemblies, it is important to check the condition of the screw and brake pads. Additionally, ensure that the wheel and drum rotate freely. If adjustments are needed, use an adjusting tool to rotate the starwheel of the adjuster assembly, expanding the brake shoes. Adjust the brake shoes until the pressure of the linings against the drum makes the wheel difficult to turn. Finally, rotate the starwheel in the opposite direction until the wheel turns freely with only a slight drag.
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Using a test light or voltmeter
A voltmeter and ammeter are essential tools for troubleshooting Dexter electric brakes. If you are experiencing issues with your brakes, you should first check the connections and then use a test light or voltmeter to test the plug and receptacle.
To measure the system voltage, connect a voltmeter to the two magnet lead wires at any brake. This can be done by using a pin probe inserted through the insulation of the wires dropping down from the chassis or by cutting the wires. Ensure the engine of the towing vehicle is running when checking the voltage so that low battery power does not affect the readings. Voltage in the system should begin at 0 volts and gradually increase to about 12 volts as the controller bar is slowly actuated. This is referred to as modulation. If there is no modulation, it means that the controller applies an immediate high voltage when activated, resulting in the brakes applying maximum power instantly.
The threshold voltage of a controller is the voltage applied to the brakes when the controller first turns on. A lower threshold voltage allows for smoother brake operation, while a higher threshold voltage can cause harsh and grabby brakes. Dexter 7" brakes draw about 2.5 amps per brake, and the total system amperage can be calculated by multiplying this number by the number of brakes/magnets in the system. To measure the brake current, ensure the engine is running and disconnect the wire at the point you wish to measure the current draw. Place the ammeter in series with this line, ensuring it has sufficient capacity and noting polarity to prevent damage to the meter. If a resistor is present in the system, it must be set to zero or bypassed to obtain the maximum amperage reading.
If adjusting the brakes does not improve braking power, it may be necessary to replace the brake shoes and magnets. After replacement, a decrease in braking performance is normal until the components have worn into the drum, which may take over 100 stops to complete.
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Frequently asked questions
First, raise the trailer and check that the wheel and drum rotate freely. Remove the adjusting hole cover from the slot on the bottom of the assembly's backing plate. With an adjusting tool, rotate the starwheel of the adjuster assembly to expand the brake shoes. Adjust the brake shoes out until the pressure of the linings against the drum makes the wheel difficult to turn. Finally, rotate the starwheel in the opposite direction until the wheel turns freely with only a slight drag.
If your Dexter 7 Electric Brakes are still not working properly after adjusting, it could be due to an electrical system failure. Check for mechanical causes such as bent or broken parts, worn-out linings or magnets, or seized lever arms or shoes. A voltmeter and ammeter are essential for troubleshooting electric brakes.
It is recommended to adjust your Dexter 7 Electric Brakes at least once a year. However, frequent manual adjustments may be required depending on the specific brake system and usage.
Signs that your Dexter 7 Electric Brakes may need adjustment include decreased braking performance, unusual heat, or smoke coming from the brakes. Additionally, if the brakes make grinding or squealing noises, it could indicate that the brake pads need to be replaced.
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