At a Glance

> Brake Response: Disc brakes generally maintain more consistent braking torque at speed and can reduce stopping distance compared with drum brakes.
> Serviceability: Because the rotor is separate from the hub, a failed rotor does not automatically force replacement of the hub if the hub remains usable.
> Fit Check: Verify 5-bolt brake flange configuration, 1/2" wheel studs, 8 on 6.5" bolt pattern, and 16" or larger wheel clearance before ordering.
> Flange Verification: Confirm your axle uses a 5-bolt brake flange. The included caliper brackets are built for that mounting style.
> Wheel Clearance: This setup is stated to fit inside 16" and larger wheels. Do not assume all wheels clear the caliper without checking profile and inside diameter.
Brand: Need a Trailer Part
SKU: 2/R-133-7-8-DDD-K

Before You Order

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

Bearings	Match inner and outer bearing numbers.
Seal	Match the seal number or dimensions.
Bolt Pattern	Verify the complete lug pattern.
Brake Size	Confirm when applicable.

Product Details

Trailer Disc Brakes / Kodiak / 7K Axles

Kodiak 13" Disc Brake Kit 8-Lug 7,000 lb Dacromet Two-Wheel Set Cap Style Rotor

A corrosion-resistant over-the-hub Kodiak two-wheel disc brake kit built for 7K trailer axles using 8 on 6.5" hubs with 1/2" studs. Loaded calipers, vented 13" rotors, and 5-bolt brackets make this a strong upgrade path from idler or drum setups.

Part Number: 2/R-133-7-8-DDD-K 13" Cap Style / 8 on 6.5" Dacromet / 7,000 lb Axles

Overview

This Kodiak two-wheel disc brake kit is designed for 7,000 lb trailer axle applications using an 865 idler hub, 1/2" wheel studs, an 8-lug on 6.5" bolt pattern, and a 5-bolt brake flange. The kit includes vented 13" Dacromet-coated cap style rotors, loaded Dacromet-coated #250 calipers with ceramic pads, and matching Dacromet-coated mounting brackets. It is a practical choice for trailer owners who want stronger, more consistent braking performance than typical drum systems, especially at highway speeds.

R&P Service Insight

Disc brake conversions are popular because they simplify service and improve braking confidence. This over-the-hub design also makes future rotor replacement easier when compared with one-piece hub-and-rotor assemblies.

Brake Response: Disc brakes generally maintain more consistent braking torque at speed and can reduce stopping distance compared with drum brakes.
Serviceability: Because the rotor is separate from the hub, a failed rotor does not automatically force replacement of the hub if the hub remains usable.
Fit Check: Verify 5-bolt brake flange configuration, 1/2" wheel studs, 8 on 6.5" bolt pattern, and 16" or larger wheel clearance before ordering.

Product Video

Take a closer look at this Kodiak 13" Dacromet disc brake kit and its overall layout before installation.

R&P Knowledge Hub

Compatibility: Designed around 7K axle applications with a 5-bolt brake flange and an 865 idler hub using 1/2" diameter studs on an 8-lug 6.5" bolt circle.

Vehicle / System Fit: Trailer axle disc brake conversion or replacement setup using Kodiak cap style over-the-hub rotors and #250 calipers.

Installation Notes: This cap style rotor fits over the hub and is held in place by the wheel and lug nuts. Wheel stud thread length should be checked because the rotor adds stack thickness.

Performance Insight: The vented rotor helps manage heat, the stainless 2-1/4" piston increases torque over standard pistons, and ceramic pads with stainless clips are intended for longer life and stable performance.

R&P Repair Insight

Over-the-hub rotor kits are often easier to live with in real trailer service because the rotor can be removed after the wheel and caliper are off, and the hub and rotor do not have to be replaced as a single piece. Before installation, the biggest sources of trouble are usually flange mismatch, stud/thread concerns, and wheel clearance assumptions.

Flange Verification: Confirm your axle uses a 5-bolt brake flange. The included caliper brackets are built for that mounting style.
Wheel Clearance: This setup is stated to fit inside 16" and larger wheels. Do not assume all wheels clear the caliper without checking profile and inside diameter.
Hub Face Change: Installing an over-the-hub rotor effectively increases overall hub-face-to-hub-face dimension by about 1/2".

Features

13" Vented Cap Style Rotors

Dacromet-coated cast iron rotors are vented to dissipate heat and are built as over-the-hub assemblies for easier future service.

Loaded #250 Calipers

Dacromet-coated calipers include ceramic brake pads with stainless steel clips, plus stainless guide bolts with thread lock and brass bleeder ports.

2-1/4" Stainless Piston

The stainless steel piston is described as 30% larger than standard pistons to increase braking torque and improve stopping performance.

Universal Two-Wheel Box

The kit includes two complete wheel-end assemblies per box, and the caliper orientation is universal for left or right side use.

Specifications

Specification	Detail
Part Number	2/RCM-133-7-8-DAC
Alternate Dexter Number	2/R-133-7-8-DDD-K
Product Type	Trailer disc brake two-wheel kit
Rotor Style	13" cap style over-the-hub rotor
Axle Rating	7,000 lbs
Bolt Pattern	8 lug on 6.5" wheel bolt pattern
Stud Size	Fits 1/2" diameter studs
Material / Finish	Dacromet-coated rotors, calipers, and mounting brackets
Caliper Piston	2-1/4" stainless steel piston
Brake Pads	Ceramic pads with stainless steel clips

Fitment / Application

Category	Details
Vehicle / System	Trailer axle hydraulic disc brake application
Primary Fit	7K axles with 5-bolt brake flange and 865 idler hub
Wheel Fit	Fits inside 16" and larger wheels
Rotor Mounting	Over the hub; wheel and lug nuts retain the rotor in place
Ordering Notes	Check flange style, hub family, wheel stud size, wheel clearance, and available wheel stud thread length before installation.

Included Components

Quantity	Item
2	Dacromet-coated 13" cap style vented rotors
2	Dacromet-coated #250 loaded calipers for 13" rotors
2	Dacromet-coated 5-bolt caliper mounting brackets for 7K axles
Included	Ceramic brake pads with stainless steel clips installed in the calipers
Included	Stainless steel guide bolts with thread lock installed and brass bleeder ports

Verify axle flange style, hub family, stud size, bolt pattern, wheel clearance, and thread length before installation. This is a two-wheel brake kit, and over-the-hub rotor installation may increase overall hub-face width by approximately 1/2".

Shop More Kodiak Disc Brake Parts

Kodiak 2/RCM-133-7-8-DAC disc brake kit Dexter 2/R-133-7-8-DDD-K 13 inch rotor 8 lug 6.5 trailer brake kit 7000 lb axle cap style over the hub rotor 865 idler hub 5 bolt brake flange dacromet ceramic loaded caliper #250 caliper stainless piston two wheel set

Kodiak 13" Disc Brake Kit 8-Lug 7,000 lb Dacromet Two-Wheel Set Cap Style Rotor (2/R-133-7-8-DDD-K)