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Heavy Duty Rear Braking Built for the DT Platform
This Rotora HD Challenge kit upgrades the rear brakes on 2019-2026 Ram 1500 (DT chassis) trucks, including the 2021-2024 TRX, with a 4-piston RG408 caliper and a 380x32mm 2-piece rotor. It is designed to match the increased stopping demands of towing, hauling, and high-speed driving on the newer DT platform. Since the DT trucks use an electronic parking brake integrated into the rear caliper, this kit includes an EPBB module to keep that system working correctly.
Key Features
- Rotora RG408 4-piston rear caliper
- 380x32mm 2-piece directional rotor
- Heat-treated, zinc-plated disc face for corrosion resistance
- HD floating drive hardware for consistent rotor centering
- HD graphite-metallic brake pads included
- Stainless steel braided DOT-compliant brake lines
- S45C steel caliper mounting brackets
- Available in 10 caliper colors
- Direct bolt-on fitment, no cutting or drilling required
- Includes Electronic Parking Brake Bypass (EPBB) module
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2019-2026 | Ram | 1500 |
| 2021-2024 | Ram | 1500 TRX |
Specifications
| Detail | Value |
|---|---|
| Part Number | HDTRX-380x32.01 |
| Axle | Rear |
| Caliper Type | 4-Piston RG408 |
| Rotor Size | 380x32mm |
| Rotor Construction | 2-Piece Directional |
| Bell Hat Material | S45C Steel |
| Disc Options | Slotted (S) or Drilled (X) |
| Pad Type | HD Graphite-Metallic, Included |
| Brake Lines | Stainless Steel Braided, DOT Compliant |
| EPBB Module | Included |
| Chassis | DT |
| UPC | N/A |
What's Included
- Pair of RG408 4-piston calipers
- Pair of 380x32mm 2-piece rotors
- HD graphite-metallic brake pads
- S45C caliper mounting brackets
- Stainless steel braided brake lines
- Electronic Parking Brake Bypass (EPBB) module
- All mounting hardware
About Rotora
Rotora designs and manufactures big brake kits and performance rotors for street, tow, and track applications. Every HD Challenge kit is engineered around a two-piece rotor design and a heavy-duty caliper to handle the added weight and stress of full-size truck use, while keeping installation straightforward for a home garage or professional shop.
FAQ
What is the HDTRX-380x32.01?
The HDTRX-380x32.01 is the Rotora HD Challenge rear big brake kit built for the 2019-2026 Ram 1500 DT chassis and the 2021-2024 TRX. It uses a 4-piston RG408 caliper and a 380x32mm 2-piece rotor along with an EPBB module for the electronic parking brake.
Why does this kit need an EPBB module?
The DT chassis Ram 1500 uses an electronic parking brake actuator integrated into the factory rear caliper. The EPBB module allows the new caliper to be installed while keeping the factory electronic parking brake function intact.
Does this kit fit the TRX as well as the standard Ram 1500?
Yes. This kit fits the 2019-2026 Ram 1500 DT and the 2021-2024 TRX, which shares the same rear hub and axle dimensions relevant to this brake upgrade.
Should I install this rear kit with a matching front kit?
Pairing a rear upgrade with a compatible front kit helps keep braking balance consistent, but this rear kit can also be installed on its own with the factory front brakes.
What is the difference between slotted and drilled rotors?
Slotted rotors clear gas and debris from the pad surface and hold up well under sustained heavy loads. Drilled rotors offer similar cooling benefits with a different look, though they see slightly more wear under extreme towing duty.
Do I need new pads with this kit?
No. HD graphite-metallic pads matched to the rotor and caliper are included in every kit, so there is nothing extra to buy for the initial installation.
Can I run this kit on a truck used for towing?
Yes. This kit is built for the added mass and heat load of towing and hauling, with a larger rear rotor and stronger caliper than the factory rear brakes.
What caliper colors are available?
This kit is available in 10 caliper finishes including zinc, red, orange, yellow, green, light blue, blue, silver, black, and white.
Installation Instructions
- Raise and support the rear of the truck, then remove the rear wheels.
- Remove the factory caliper, bracket, and rotor from each rear hub.
- Install the EPBB module per the included wiring instructions to maintain electronic parking brake function.
- Install the included S45C caliper bracket onto the factory hub using the provided hardware.
- Mount the new 380x32mm 2-piece rotor onto the hub.
- Install the RG408 caliper and included HD graphite-metallic pads onto the bracket.
- Connect the new stainless steel braided brake line to the caliper and existing hard line.
- Bleed the brake system at each caliper until fluid runs clear of air, then reinstall the wheels and torque to spec.
WARNING: This product can expose you to chemicals including brake dust, which are known to the State of California to cause cancer. For more information, visit www.p65warnings.ca.gov.
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