The SRAM Force eTap AXS D2 HRD [paid link] is a high-performance hydraulic disc brake system built into a wireless electronic groupset. It delivers smooth, reliable braking with wireless shifting integration. This guide offers detailed steps for installation, adjustment, maintenance, troubleshooting, optimization, and compatibility assessment for the SRAM Force eTap AXS D2 HRD calipers and levers.
Tools Required
- 4mm, 5mm, and 8mm hex wrenches
- Torx T25 wrench
- SRAM bleed kit with DOT 4 fluid
- Torque wrench (2–8 Nm range)
- Clean lint-free cloths
- Isopropyl alcohol
- Rotor truing tool
- Brake pad spacing tool or flat plastic tire lever
Installation of Force eTap AXS D2 HRD Brake System
Installing the Force eTap AXS D2 HRD system requires careful attention to both hydraulic and electronic elements. Begin by mounting the calipers and levers before routing hoses.
For the calipers, align each unit with the appropriate post mount adapter and rotor size. Apply a thin layer of grease to the bolt threads and torque bolts to 8 Nm. Ensure the pads are centered over the rotor.
Handlebar installation of the HRD levers requires routing the hydraulic hoses inside the bar or externally, depending on frame compatibility. Insert the levers onto the handlebar, positioning them at a comfortable angle relative to your hand position. Tighten the clamp bolts to 6–8 Nm.
Hydraulic hose connections must be secure. If hoses are trimmed to length, reinsert the barbed fitting and compression olive using SRAM’s hose shortening tool to avoid leaks. Once connected, proceed to the bleeding process.
Bleeding the System for Optimal Pressure
A full bleed is critical for precise brake modulation. Use the SRAM Bleeding Edge port to avoid air bubbles. Begin with the caliper port, attach the bleed fitting, and then connect the lever syringe. Open the bleed ports sequentially and push fluid through the system, reversing once to ensure no trapped air remains.
After bleeding, close all fittings tightly. Clean all surfaces with isopropyl alcohol to eliminate residual DOT fluid, which can damage paint or compromise braking surfaces.
Lever Adjustment and Pad Contact Tuning
The Force eTap AXS D2 HRD system allows micro-adjustment of lever reach and pad contact. Use the 2.5mm reach adjustment screw located inside the lever body. Adjust to match finger length and grip preference.
Pad contact point is controlled electronically. Connect the AXS app, select the appropriate lever, and adjust pad contact sensitivity for quicker engagement or longer modulation, depending on riding style.
Rotor Alignment and Caliper Centering
Rotor rub and squealing are typically due to misaligned calipers or warped rotors. Begin by loosening the caliper mounting bolts slightly. Pull the brake lever firmly and hold while tightening the bolts evenly. This method auto-centers the caliper on the rotor.
Check rotor true using a rotor truing tool. If necessary, gently bend the rotor back into alignment using the tool’s slots. Repeat the caliper alignment if adjustments are made.
Troubleshooting Common Issues
Excessive lever throw may indicate air in the system or worn pads. Check pad thickness and replace if below 1mm. If pads are fine, re-bleed the system ensuring all air is expelled.
Brake squeal under dry conditions often relates to contamination. Remove the pads and clean with isopropyl alcohol. Clean the rotor thoroughly or replace if contamination persists.
Lever fade on long descents points to overheating. Consider using larger rotors or rotors with heat dissipation features to improve performance. Also ensure the pads used are rated for high-temperature use.
Routine Maintenance Schedule
To maintain peak performance, inspect the brake pads and rotors every 500 miles. Replace pads when the friction material wears to 1mm. Clean rotors with alcohol and a lint-free cloth.
Hydraulic fluid should be bled at least once per season or after any major ride in extreme heat or cold. Brake hoses should be checked for kinks or abrasions and replaced if compromised.
Keep the AXS firmware updated through the mobile app. Software updates often include refinements to braking and shifting behavior.
Customizing Brake Feel for Rider Preference
Riders can tailor braking behavior via the AXS app and physical adjustments. Those seeking aggressive bite might use sintered metallic pads and minimal pad contact delay via the app. Riders preferring modulation should opt for organic pads and increase pad contact time.
Rotor size also impacts braking power. Upgrading to 180mm rotors (if frame and fork allow) increases leverage and stopping force for heavier riders or steep descents.
Upgrading Components for Enhanced Performance
While the Force eTap AXS D2 HRD is already high-performing, upgrading to SRAM’s CenterLine XR rotors can improve heat dissipation and reduce noise. Likewise, switching to SRAM’s top-tier Red brake pads offers better compound durability.
Bar tape with additional grip can improve braking control, particularly in wet conditions. Consider replacing worn bar tape regularly to retain a confident grip on the lever.
Force eTap AXS D2 HRD vs. Rival and Red HRD
Compared to SRAM Rival eTap AXS HRD [paid link], the Force D2 offers reduced weight, improved ergonomics, and refined lever texture. Compared to Red eTap AXS HRD [paid link], Force uses the same braking architecture but slightly heavier materials and fewer titanium components.
Riders focused on weight savings may opt for Red, while those prioritizing performance-to-cost ratio will find Force offers nearly identical braking performance at a lower price.
Compatibility with Other SRAM AXS Components
The Force eTap AXS D2 HRD system integrates seamlessly with any SRAM AXS component across Rival, Force, and Red levels. You can pair Force D2 levers with a Red derailleur or a Rival power meter crankset.
However, mechanical or non-AXS components are incompatible due to the wireless communication protocol and hydraulic interface.
Rotor compatibility spans all SRAM CenterLine and Paceline models, while pad compatibility includes all SRAM road disc pad shapes in organic and metallic compounds.
FAQs
1. Can I install Force eTap AXS D2 HRD levers on an internally routed frame?
Yes, the hoses are compatible with internal routing. You may need additional hose length and grommets based on frame design.
2. How often should I bleed my Force eTap AXS D2 HRD brakes?
At least once a season or every 12 months. More frequent bleeds may be required for riders in mountainous terrain or harsh climates.
3. What pad compounds work best for wet conditions?
Sintered metallic pads offer better performance in wet or muddy environments due to their higher heat and contamination resistance.
4. Are Force D2 HRD calipers cross-compatible with SRAM mountain brakes?
No, Force D2 HRD calipers are designed specifically for road use and are not compatible with MTB calipers or levers.
5. My brake lever feels soft even after bleeding. What should I do?
Double-check the bleed process for trapped air and ensure the caliper pistons are not sticky or uneven. Re-bleeding with fresh DOT 4 fluid often resolves this.
6. Can I change the lever angle without affecting braking performance?
Yes. Adjusting the lever angle is purely ergonomic and does not affect braking force or modulation as long as the lever is torqued correctly.
Conclusion
The SRAM Force eTap AXS D2 HRD brake system is a sophisticated yet user-serviceable component that delivers top-tier stopping power and control. By following proper installation, adjustment, and maintenance procedures, riders can enjoy consistent and optimized braking performance for thousands of miles. Whether customizing for performance or troubleshooting minor issues, this guide equips cyclists with the necessary knowledge to get the best out of their Force eTap AXS D2 HRD brakes.