R1 CONCEPTS HK1-42004 Brake Pad Shoe 194873336745

( Brand: R1 Concepts ), ( Manufacturer Part Number: HK1-42004 ), ( Type: Auto ), ( UPC: 194873336745 ), ( California Prop 65 Warning: This Product Contains Antimony Oxide And Other Chemicals Which Is Known In The State Of California To Cause Cancer )

Review R1 CONCEPTS

The R1 Concepts HK1-42004 is a high-performance hydraulic brake kit designed for BMW M3 E46 models. This brake kit is an excellent upgrade for those seeking improved braking performance and feel over the stock brakes.

The HK1-42004 kit includes four-piston calipers in the front and two-piston calipers in the rear, which are made of high-strength billet aluminum. These calipers provide increased clamping force and better heat dissipation, resulting in shorter brake pedal travel and more responsive braking.

The kit also comes with 355mm x 32mm vented and slotted front rotors and 330mm x 28mm vented and slotted rear rotors. The rotors have a unique cross-drilled and slotted design, which helps to reduce heat build-up and increase brake pad bite. The slotted rotors also provide better performance in wet conditions by allowing water and debris to be expelled more effectively.

The R1 Concepts HK1-42004 kit includes stainless steel brake lines, which provide better brake line stiffness and eliminates the possibility of brake fluid contamination from the rubber lines. The kit also includes R1 Concepts' proprietary stainless steel brake pads, which provide excellent stopping power and durability.

The installation of the R1 Concepts HK1-42004 kit is relatively straightforward, with clear instructions provided. The kit includes all necessary hardware, including new brake master cylinder, brake proportioning valve, and brake booster vacuum hose.

In summary, the R1 Concepts HK1-42004 is a high-performance hydraulic brake kit that provides improved braking performance and feel for BMW M3 E46 models. The kit includes high-performance calipers, vented and slotted rotors, stainless steel brake lines, and R1 Concepts' proprietary stainless steel brake pads. The installation process is relatively straightforward, making it an excellent upgrade for those seeking to enhance their driving experience.

The R1 Concepts HK1-42004 is a popular aftermarket cooling kit for the Subaru WRX and STI. Here are some pros and cons that may help you make an informed decision before purchasing this product:

1. Enhanced Cooling: The R1 Concepts HK1-42004 cooling kit provides improved cooling performance by increasing the size of the intercooler and the core volume. This helps to reduce the temperature drop between the intake and the exhaust gases, which in turn increases engine power and efficiency.

2. Durability: The intercooler core is made of T-6 aluminum, which is known for its strength and durability. The end tanks are also made of cast aluminum, making the entire kit robust and capable of withstanding the rigors of high-performance driving.

3. Easy Installation: The cooling kit comes with all the necessary hardware and instructions for installation. It can typically be installed in a few hours with basic hand tools.

4. Improved Throttle Response: By reducing the temperature drop between the intake and exhaust gases, the R1 Concepts HK1-42004 cooling kit helps to improve throttle response, making the engine more responsive and quicker to respond to driver inputs.

5. Aesthetic Appeal: The R1 Concepts HK1-42004 cooling kit comes with a polished finish, giving it an attractive appearance that can enhance the look of your Subaru WRX or STI.

1. Cost: The R1 Concepts HK1-42004 cooling kit is pricier than some other aftermarket cooling solutions. This may not be an issue for those who prioritize performance and durability, but it could be a deciding factor for some buyers.

2. Size: The larger intercooler core and size of the cooling kit may make it difficult to fit in some tight engine bays, especially in older Subaru models with limited clearance.

3. Maintenance: While the R1 Concepts HK1-42004 cooling kit is durable, it does require regular maintenance, such as cleaning the intercooler core and checking for leaks. This can add to the overall cost of ownership.

The R1 Concepts HK1-42004 cooling kit is an excellent choice for Subaru WRX and STI owners who are looking for improved cooling performance, durability, and enhanced throttle response. While it comes with a higher price tag and requires some maintenance, its benefits far outweigh the cons for those who prioritize performance and driving enjoyment.

If you are a Subaru WRX or STI owner and you are looking to improve the cooling performance and overall driving experience of your vehicle, the R1 Concepts HK1-42004 cooling kit is a worthy investment. It is a high-quality product that delivers on its promises and can help you get the most out of your Subaru.

Details:

May not be accurate. Fast Free, Shipping: Brand R1 Concepts, Part Number HK1-42004, UPC Code 5, Condition New. This item comes with the full manufacturers warranty.

The compatibility section is not always 100% accurate. The color, quantity, size, etc.

part #: hk142004 prices

• $21.68-$25.36

specifications boomersbrake:

• brand: R1 Concepts
• manufacturer part number: HK1-42004
• type: Auto
• upc: 194873336745
• california prop 65 warning: This Product Contains Antimony Oxide And Other Chemicals Which Is Known In The State Of California To Cause Cancer

returns boomersbrake:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

seller boomersbrake:

• rating: 99.7%
• city: Flat Rock, North Carolina
• # reviews: 15566

payments boomersbrake:

• other
• credit card: Visa
• wallet: Paypal

offer boomersbrake:

• sold: 0
• availability: In Stock
• started: January 28, 2026
• quantity: 2
• options: Ship-to-home

shipping boomersbrake:

• class: Standard
• type: Fixed
• transit: 2-6 Days
• service: Standard
• cost: $0.00

general boomersbrake:

• condition: New
• Car Truck Parts Accessories > Brakes Brake Parts > Brake Pad Shoe Hardware

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