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Your search for "12-1/4 brake magnet" revealed the following:

Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 10,000 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 10,000 lb axles (77M-1210)
$22.32
TWO Brake Magnets Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 15,000 lb axles (77M-1210-LOT2)
TWO Brake Magnets Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 15,000 lb axles (77M-1210-LOT2)
$32.99
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 9000 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 9000 lb axles (77M-1210)
$22.32
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 8000 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 8000 lb axles (77M-1210)
$22.32
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 7200 lb axles (77M-1210)
Brake Magnet Replaces Dexter K71-378-00 Magnet fits all 12-1/4" Brakes after 1992 Plus Most 7200 lb axles (77M-1210)
$22.32
Electric Brake Magnet for 12-1/4" Dexter & Universal 8K-15K Axles (77M-1210)
Electric Brake Magnet for 12-1/4" Dexter & Universal 8K-15K Axles (77M-1210)
$22.99
Genuine Dexter 12-1/4" Electric Trailer Brake Magnet Kit (K71-378-00)
Genuine Dexter 12-1/4" Electric Trailer Brake Magnet Kit (K71-378-00)
$100.32
12.25" X 5" Blue Wire Electric Brake Magnet Kit Backing Plate Shoe Left 12K 15K (K71-503-MAG)
12.25" X 5" Blue Wire Electric Brake Magnet Kit Backing Plate Shoe Left 12K 15K (K71-503-MAG)
$229.82
Brake Magnet – Replaces Dexter 7.2K and 8K Hybrid – Black Wire with Springs and Clips (77M-1208HB)
Brake Magnet – Replaces Dexter 7.2K and 8K Hybrid – Black Wire with Springs and Clips (77M-1208HB)
$22.32
FOUR Electric Brake Magnet Kit for Dexter Lippert 7.2K to 15k Trailer Axle (77M-1210-LOT4)
FOUR Electric Brake Magnet Kit for Dexter Lippert 7.2K to 15k Trailer Axle (77M-1210-LOT4)
$81.53

How Electric Trailer Brakes Work — and How to Troubleshoot Them

Electric trailer brakes are a chain: the controller sends power, the wiring carries it, the magnet reacts, and the brake shoes use the rotating drum to create braking force. When trailer braking becomes weak, intermittent, uneven, or completely absent, the fastest diagnosis usually comes from finding where that chain stops...

Idler Hub vs. Hub & Drum: Which Does My Trailer Need?

Trailer wheels can ride on two very different-looking parts: an idler hub or a hub & drum assembly. Both contain bearings and support the wheel, but only a hub & drum contains the internal braking surface used by drum-brake shoes. Before ordering a replacement hub, identify whether that wheel position...