K23-438/439 Electric Trailer Brake 12.25 X 4” 7 Holes (Yellow wire)

K23-438/439 electric trailer brake
The electric trailer brake K23-438 is fully assembled and is intended to replace the electric trailer brake assembly. 12-1/4 x 4-inch drum size. Suitable for trailers with 10000-pound axles on the left side. Self-adjustable for better performance and braking power.
Brake type: electric
Drum size: 12-1/4 x 4 inches
Brake fit: left side
Capacity: 10000 pounds.
Bolt hole type: 7
Self-adjustment: Yes
Dexter number: K23-438-00
Note: Electric brake controller is required (sold separately)
Phone: K23-438
Reason for replacing the brake hardware
Worn and weak return springs will cause friction between the brake lining and the brake drum, leading to premature brake failure.
Pressing the spring will lose tension, causing the brake shoes to swing or stick tightly to the surface of the brake drum, leading to premature failure of the brake lining.
Set adjustment screws will not adjust the shoes correctly.
The rubber dust plug will rupture over time and cause dirt to contaminate the lining. (Not shown.)
The stretched self-adjusting cable prevents the self-adjusting rod from correctly aligning the shoe. (Not shown or illustrated.)

The importance of high-quality traction and electric braking
K23-438/439 electric trailer brake 12.25 x 4 "7 holes (yellow line)
You may have realized that more than just the tractor's brakes are required to stop the vehicle and its trailer within the appropriate time frame. Considering the weight and speed of the trailer, it is evident that the trailer also needs to tilt using its braking force.
This is achieved through the trailer brakes, which can be one of two types: surge (mechanical or hydraulic), which relies on inertia for automatic deceleration, or electric brakes, which require an electrical connection to the tractor to operate. The principle behind the surge (also known as override or overspeed) brake is simple.
The coupling includes a sliding shaft connected to the traction ball. Due to vehicle deceleration, the axle slides when pushed and applies pressure directly to the mechanical linkage (mechanical brake) or the linkage connected to the hydraulic cylinder, thereby generating hydraulic pressure on the braking system (hydraulic brake). These often appear on camping trailers or boat trailers.
Electric trailer brakes may cause wear and slow down the trailer by activating the electromagnetic brake drum. When the surge brake operates independently, the electric trailer brake must be connected to the power supply of the towing vehicle and adjusted by the brake control unit or electric brake controller.

How to test trailer brake magnets
Visual inspection steps:
If any coil can be seen in the center of the magnet, it indicates that the interest is worn and should be replaced
2. Place a straight-edge tool horizontally on top of the magnet. The edge of the interest should always be parallel to the straight edge. Any pitting or changes on the surface of the magnet indicate abnormal wear and should be replaced.
3. Check the magnet for any grease or oil residue; if so, replace the magnet.
Testing:
A multimeter capable of reading amperes and ohms is required to test the trailer brake magnet. You can also use the ever power supply because it has built-in testing functions. To experiment with a multimeter, you will connect the Ammeter to the blue wire from the back of the brake controller, or use the diagnostic reading of the brake controller. If the current intensity exceeds the specified value (see table below), replace one or more magnets. If the task is less than the fixed value, it indicates that the wire is damaged and one or more magnets should be replaced.