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Maximum Rear Clamping Force for Classic Ram Trucks
This Rotora HD Challenge kit steps the rear brakes on 2011-2019 Ram 1500 Classic (DS chassis) trucks up to a 4-piston RG404 caliper and a large 380x32mm 2-piece rotor. It is built for trucks that see the heaviest towing and hauling duty, where extra rotor mass and swept area help control heat over long descents and repeated hard stops. The complete kit includes pads, lines, and brackets for a clean bolt-on install.
Key Features
- Rotora RG404 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
- Choice of slotted or drilled rotor face
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2011-2019 | Ram | 1500 |
Specifications
| Detail | Value |
|---|---|
| Part Number | HDRamDS-380x32.01 |
| Axle | Rear |
| Caliper Type | 4-Piston RG404 |
| 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 |
| Chassis | DS (Classic) |
| UPC | N/A |
What's Included
- Pair of RG404 4-piston calipers
- Pair of 380x32mm 2-piece rotors
- HD graphite-metallic brake pads
- S45C caliper mounting brackets
- Stainless steel braided brake lines
- 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.
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FAQ
What is the HDRamDS-380x32.01?
The HDRamDS-380x32.01 is the Rotora HD Challenge rear big brake kit built for the 2011-2019 Ram 1500 Classic. It pairs a 4-piston RG404 caliper with a 380x32mm 2-piece rotor, the largest rear option in the HD Challenge lineup for this chassis.
How does this kit compare to the 355x32mm rear kit?
This kit uses a larger 380mm rotor diameter for additional swept area and heat capacity, making it a better fit for trucks used for heavier or more frequent towing than the 355mm option.
Does this kit work with the factory parking brake?
Yes. This rear kit retains compatibility with the factory drum-in-hat or integrated parking brake setup used on the DS chassis Ram 1500 Classic.
Does this kit work with the factory ABS system?
Yes. The kit retains the stock ABS sensor and tone ring, so the factory anti-lock braking system continues to function normally after installation.
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 heavy towing and hauling, with a large rear rotor and strong caliper compared to 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 included S45C caliper bracket onto the factory hub using the provided hardware.
- Mount the new 380x32mm 2-piece rotor onto the hub.
- Install the RG404 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.
- Reinstall the wheels, torque to spec, and bed in the new pads with gradual stops before normal driving.
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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