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Your search for "12" electric backing plate" revealed the following:

12RVEBRH
One (1) 12" x 2" Right Brake Side Electric Trailer Axle Backing Plate Back (12RVEBRH)
$74.99
BK-12E-01SA
Trailer Backing Plate Brake Electric 12" Aftermarket Self Adjust Left Hand 7000 (BK-12E-01SA)
$69.99
BK-12E-FSA-SET
Pair of Trailer Backing Plate Brakes Electric 12" Self Adjust 7000 Left Right (BK-12E-FSA-SET)
$139.99
PAIR 12-1/4x5" 12K 15K Electric Backing Plate Trailer Brake Fit Dexter 5" 23-442 (BK-12KHDE-SET)
PAIR 12-1/4x5" 12K 15K Electric Backing Plate Trailer Brake Fit Dexter 5" 23-442 (BK-12KHDE-SET)
$218.43
One Pair (2) Trailer Electric Brake Complete Back Plate 12x2 5.2K-7K axle Camper RV (12RVEB-1P)
One Pair (2) Trailer Electric Brake Complete Back Plate 12x2 5.2K-7K axle Camper RV (12RVEB-1P)
$129.61
BK-12E-02SA
12" Electric Trailer Brake Backing Plate — Right Hand, 7K Axles (BK-12E-02SA)
$69.99
Four 12-1/4x3-3/8" 10K GD Electric Backing Plate 10000# Trailer Brake Fit Dexter (BK-10KE-SET2)
Four 12-1/4x3-3/8" 10K GD Electric Backing Plate 10000# Trailer Brake Fit Dexter (BK-10KE-SET2)
$459.99
BK-12E-02SA
Trailer Backing Plate Brake Electric 12" Aftermarket Self Adjust Right Hand 7000 (BK-12E-02SA)
$61.31
LEFT- 12-1/4"x3-3/8 Genuine Dexter Electric Brake Backing Plate 10K GD Trailer (023-450-00)
LEFT- 12-1/4"x3-3/8 Genuine Dexter Electric Brake Backing Plate 10K GD Trailer (023-450-00)
$369.99
12 x 2 Dexter Genuine 7000# Trailer Electric Brake Backing Plate Left Drivers (023-180-00)
12 x 2 Dexter Genuine 7000# Trailer Electric Brake Backing Plate Left Drivers (023-180-00)
$146.99

Everything You Need to Know About Electric Trailer Brakes

What Electric Trailer Brakes Do Electric trailer brakes convert electrical signal from your tow vehicle into mechanical braking force at each wheel. When you press the brake pedal, your brake controller sends power through the blue brake wire to the trailer’s brake magnets. The magnets activate the brake shoes inside...

Idler Hub vs Brake Drum: How to Identify the Difference

Trailer wheel assemblies use either an idler hub or a hub & drum assembly. While both support the wheel and bearings, only a drum is designed to work with brake shoes. Before ordering replacement parts, confirm whether your trailer uses idler hubs or brake drums. What Is an Idler Hub? An...