At a Glance

> One-Axle Service: This pair gives you the left and right side needed to service one axle correctly.
> Cleaner Repair Path: Replacing complete assemblies can be more straightforward than piecing together mixed old and new internals.
> Balanced Brake Work: Servicing both sides together helps support more even response across the axle.
> Check 1: Confirm the trailer uses 12" x 2" electric drum brakes.
> Check 2: Verify the axle has a standard 5-bolt brake flange.
Brand: Need A Trailer Part®
SKU: 12RVEB-1P

Before You Order

Match the part number, measurements and connection points that apply to your trailer.

Hub Face	Measure hub face to hub face.
Spring Center	Measure mounting centers and confirm perch configuration.
Capacity	Match the required axle rating.
Brakes	Confirm brake type and flange configuration.

Product Details

Trailer Brake Assemblies

12" x 2" Electric Trailer Brake Assembly Pair – 5 Bolt – 5.2K–7K Axles

A clean, complete brake refresh for one axle. This pair includes one left-hand and one right-hand 12" x 2" electric backing plate assembly so you can service both sides together with less guesswork and more confidence.

Part Number: 12RVEB-1P 12" x 2" Electric Drum Brake Size Pair • Left + Right • 5-Bolt

Overview

This 12RVEB-1P pair is built for trailers using 12" x 2" electric drum brakes on a standard 5-bolt brake flange. You get one left-hand and one right-hand complete backing plate assembly for one axle, making this a smart choice for brake service when worn shoes, tired magnets, and old internal hardware are all due at the same time.

Buyers usually land here for one reason: they want to stop chasing individual brake internals. A complete assembly approach helps simplify service, reduce parts mixing, and get both sides of the axle refreshed together.

Product Video

Watch the brake assembly closer before you buy. This video gives you a clearer look at the one-pair configuration for single-axle brake service. We have a video link issue - let's fix with this url instead; https://youtu.be/aak0hwjU4XU

Need the 2-Pair Set Instead?

If you are servicing both axles on a tandem-axle trailer, the larger 4-plate version may be the better buy. It gives you two left-hand and two right-hand assemblies in one matched package so you can refresh the full trailer brake setup at the same time.

Two-Axle Service 2 Left + 2 Right 4 Complete Assemblies

The related 2 Pair listing is the right move when one pair is not enough and you want the complete two-axle version of this same brake family.

Shop the 2-Pair Listing

R&P Service Insight

Brake wear usually does not happen in isolation. By the time shoes are worn down, the magnet and internal spring hardware are often at or near the same service point. That is why complete backing plate assemblies remain one of the most practical ways to refresh trailer braking on a working axle.

One-Axle Service: This pair gives you the left and right side needed to service one axle correctly.
Cleaner Repair Path: Replacing complete assemblies can be more straightforward than piecing together mixed old and new internals.
Balanced Brake Work: Servicing both sides together helps support more even response across the axle.

R&P Knowledge Hub

Compatibility: Typically used on trailers with 5,200 lb, 6,000 lb, and 7,000 lb axles equipped with 12" x 2" electric drum brakes and a standard 5-bolt mounting flange.

Wheel / System Fit: This brake size is commonly associated with 14-1/2", 15", 16", and 16-1/2" wheel applications using standard hub-and-drum electric brake setups.

Installation Notes: Before ordering, verify brake dimensions, axle rating, flange pattern, wheel size, and trailer wiring condition. A correct 12" x 2" callout matters more than appearance alone.

Performance Insight: Electric brakes work by energizing the magnet through the brake controller, which engages the drum and activates the shoes through the internal lever system. Replacing the backing plate assembly restores the core wear items together.

R&P Repair Insight

Customers most often get tripped up on three things: ordering the wrong brake size, overlooking flange count, or forgetting that a proper one-axle set needs both a left-hand and a right-hand assembly. Confirm those three points first and the rest of the purchase becomes much easier.

Check 1: Confirm the trailer uses 12" x 2" electric drum brakes.
Check 2: Verify the axle has a standard 5-bolt brake flange.
Check 3: Make sure you need one left-hand and one right-hand assembly for a single axle service.

Features

Complete Pair for One Axle

Includes one left-hand and one right-hand backing plate assembly so both sides of one axle can be serviced together.

12" x 2" Brake Size

Built for trailers using the common 12" diameter by 2" wide electric drum brake format found on many 5.2K to 7K axle applications.

Standard 5-Bolt Flange Fit

Designed around the standard 5-bolt mounting pattern used by many 12" x 2" electric brake axle setups.

Complete Backing Plate Assemblies

Includes the core brake components already assembled on the plates, including shoes, springs, magnet, and internal hardware.

Specifications

Specification	Detail
Part Number	12RVEB-1P
Product Type	Electric trailer brake backing plate assembly pair
Brake Size	12" diameter x 2" wide
Brake Type	Electric drum brake
Axle Class	5,200 lb / 6,000 lb / 7,000 lb
Mounting Pattern	5-bolt brake flange
Orientation	One right-hand and one left-hand assembly
Included Core Components	Shoes, springs, magnet, and internal hardware as part of the complete assemblies

Fitment / Application

Category	Details
Typical Axles	5,200 lb, 6,000 lb, and 7,000 lb trailer axles using 12" x 2" electric drum brakes
Primary Fit	Standard 5-bolt brake flange applications
Common Wheel Sizes	14-1/2", 15", 16", and 16-1/2" wheel applications commonly paired with this brake size
Primary Use Case	Brake service for one trailer axle where both left and right assemblies need replacement
Best Alternative	Need to service both axles? Use the linked 2-Pair listing instead.
Notes	Verify measurements, brake size, axle class, flange pattern, and overall compatibility before installation.

Included Components

Quantity	Item
1	Left-hand 12" x 2" electric brake backing plate assembly
1	Right-hand 12" x 2" electric brake backing plate assembly
Included in assemblies	Brake shoes
Included in assemblies	Brake springs
Included in assemblies	Brake magnets and internal assembly hardware

Important: Verify all specifications before installation, including brake size, axle rating, flange pattern, side orientation, and overall application match.

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