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Balanced Rear Braking to Complete the Explorer ST Brake Upgrade
The RFK.641.01 Rotora Street Challenge Rear Brake System pairs a 4-piston RF404 forged caliper with a 355x29mm 2-piece floating rotor to balance out any front big brake kit on the 2020-2023 Ford Explorer ST. A properly matched rear system improves brake bias, stability under hard braking, and overall pedal feel.
Key Features
- 4-piston RF404 forged aluminum caliper for balanced rear clamping force
- 355x29mm 2-piece floating rotor for reduced weight and improved cooling
- Direct bolt-on fitment for the rear axle, no permanent modification required
- Available in 10 caliper finishes including Natural Anodize (Zinc)
- Slotted or Drilled rotor face options to match braking preference
- Stainless steel braided brake lines included for firmer pedal feel
- Performance brake pads matched to the RF404 caliper included
- Designed to complement front Street Challenge brake systems
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2020-2023 | Ford | Explorer | ST |
Specifications
| Detail | Value |
|---|---|
| MPN | RFK.641.01 |
| Caliper Type | 4-piston RF404 forged aluminum |
| Rotor Size | 355x29mm |
| Rotor Type | 2-piece floating disc |
| Position | Rear |
| Finish Options | 10 caliper colors, Slotted or Drilled rotor |
| Fitment | 2020-2023 Ford Explorer ST |
| Warranty | Manufacturer limited warranty |
What's Included
- 2x RF404 4-piston forged aluminum calipers
- 2x 355x29mm 2-piece floating rotors
- Stainless steel braided brake lines
- Mounting brackets and hardware
- Performance brake pads
About Rotora
Rotora designs and manufactures big brake kits for street and track enthusiasts, engineering forged aluminum calipers and 2-piece rotors that deliver consistent stopping power under demanding conditions.
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FAQ
What is the RFK.641.01?The RFK.641.01 is a Rotora Street Challenge rear brake system for the 2020-2023 Ford Explorer ST, featuring a 4-piston RF404 forged aluminum caliper and a 355x29mm 2-piece floating rotor.
Should I pair this with a front Street Challenge kit?Yes, this rear system is designed to complement front Street Challenge brake systems for balanced braking performance across the vehicle.
What caliper colors are available?The RFK.641.01 is available in 10 caliper finishes, including Red, Dark Metallic Blue, Silver, Gloss Black, Green, Orange, Light Metallic Blue, White, Black Hard-Anodize Finish, Yellow, and Natural Anodize (Zinc).
What is the difference between Slotted and Drilled rotors?Slotted rotors clear gas and debris from the pad surface, while Drilled rotors add additional cooling channels through the rotor face. Both are available for this kit.
Does this kit include brake pads?Yes, performance brake pads matched to the RF404 caliper are included with this kit.
Is this a front or rear brake system?The RFK.641.01 is a rear brake system. Matching front systems are available separately for the Explorer ST.
Will I need to modify my Explorer to install this kit?No, this kit is designed for direct bolt-on installation on the rear axle without permanent modification.
What is the rotor construction on this kit?The RFK.641.01 uses a 355x29mm 2-piece floating rotor design for reduced rotational weight and improved heat dissipation.
Install Instructions
- Lift the vehicle and secure it on jack stands, then remove the rear wheels.
- Remove the factory rear calipers and disconnect the brake lines.
- Remove the factory rear rotors and brake hardware.
- Install the new 355x29mm 2-piece floating rotors onto the rear hubs.
- Mount the RF404 4-piston calipers using the supplied brackets and hardware.
- Install the included performance brake pads into the calipers.
- Connect the new stainless steel braided brake lines and torque all fittings.
- Bleed the brake system thoroughly and check for leaks.
- Reinstall the wheels, torque to spec, and bed in the new brakes before hard driving.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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