The SRAM Force eTap AXS D2 HRD [paid link] brake set represents a significant refinement in SRAM’s second-generation wireless groupset technology. As the disc hydraulic brake option within the Force eTap AXS D2 lineup, this brake set caters to performance-oriented road cyclists who demand powerful stopping power, wireless connectivity, and refined ergonomics. In this technical guide, we’ll examine how the Force eTap AXS D2 HRD system installs, performs, and compares with similar options from Shimano and Campagnolo, helping riders evaluate whether this is the optimal system for their road setup.
Tools Required
- 4mm and 5mm hex keys
- T10 and T25 Torx wrenches
- Hydraulic hose cutter
- Bleed kit (SRAM-specific)
- DOT 5.1 brake fluid
- Torque wrench
- Clean rag and isopropyl alcohol
- Digital caliper (optional for alignment checks)
Installation Overview of Force eTap AXS D2 HRD
Installing the Force eTap AXS D2 HRD brake system involves both the hydraulic calipers and the updated D2 lever design. These are integrated with SRAM’s AXS wireless platform, requiring no cables between shifters and derailleurs.
Caliper Mounting and Hose Connection
The flat-mount calipers attach directly to standard frame mounts. Hose routing should be planned in advance to avoid kinks or interference with frame internals. The banjo fitting allows for a clean hose exit, and the connection to the lever body is straightforward using compression fittings.
Lever Setup
SRAM’s updated D2 levers feature refined ergonomics with a narrower grip profile and enhanced tactile feedback. They are compatible with standard 31.8mm bars and install using a single clamp bolt. Ensure the levers are positioned symmetrically, and angle them to match wrist alignment.
Hydraulic Bleeding
DOT 5.1 fluid must be used exclusively with this system. Perform a full bleed using SRAM’s two-syringe method. Ensure no air remains in the lever or caliper, and confirm lever feel is firm before riding.
Pairing with AXS Components
Each lever houses a wireless module. Pairing with derailleurs and other AXS components is done via the AXS app or manually using the AXS buttons. Check firmware updates and battery status via the app before road use.
Adjustment and Fine-Tuning
Once installed, the Force eTap AXS D2 HRD system allows several adjustments:
Reach Adjustment
Reach can be customized using a 2.5mm hex key at the lever. This allows for ideal lever placement for small or large hands, improving comfort and control.
Contact Point Adjustment
Although less prominent than previous generations, lever feel can still be tuned by adjusting the caliper piston pad gap slightly during bleed or pad replacement.
Rotor Alignment
To eliminate rotor rub, ensure the caliper is centered. Loosen mounting bolts, squeeze the lever to center the caliper, then retighten to torque specs (6-8 Nm). Use a feeler gauge or visual inspection to confirm rotor clearance.
Maintenance and Longevity
Proper maintenance ensures consistent performance over time:
Pad Replacement
Use SRAM organic or sintered pads, depending on ride conditions. Pads are held with a single bolt and secured with a clip. Check for pad wear every 1000–1500 km.
Rotor Wear
SRAM CenterLine rotors are compatible and come in 140mm or 160mm options. Replace when the thickness drops below 1.55mm.
Fluid Changes
Bleed intervals depend on riding intensity but are typically recommended every 12–18 months. Check for fluid discoloration or spongy lever feel as signs for servicing.
Firmware Updates
Regularly check for updates via the AXS mobile app to ensure wireless reliability and bug fixes.
Common Setup Issues and Troubleshooting
Several common issues may arise during installation or riding:
Spongy Lever Feel
Usually caused by air in the system. Re-bleed using the proper bleed block and two-syringe system.
Persistent Rotor Rub
May be due to misaligned calipers, bent rotors, or contaminated pads. Re-align or true rotors, and clean all braking surfaces with isopropyl alcohol.
Unresponsive Lever Activation
Check for dead CR2032 batteries in the levers. These should last 1.5–2 years under normal use.
Connectivity Loss with AXS App
Ensure the lever is awake by pressing the AXS button. If still unresponsive, replace the battery or reset the unit.
Customization and Optimization
The Force eTap AXS D2 HRD can be tuned for personal riding styles:
Rotor Sizing
Heavier riders or those descending frequently may prefer 160mm rotors front and rear for added modulation and thermal management. Lighter riders or flat terrain cyclists can opt for 140mm to reduce weight.
Pad Compound Choice
Organic pads offer quieter operation and better modulation, ideal for dry road conditions. Sintered pads offer superior longevity and wet performance but can be noisier.
Lever Ergonomics
The D2 lever body is smaller and less bulky, making it a strong choice for riders with smaller hands or those seeking a minimalistic feel.
Integration with Other AXS Components
Seamless compatibility with SRAM Red or Rival AXS allows riders to mix components based on budget or weight preferences without affecting braking performance.
Compatibility Considerations
The Force eTap AXS D2 HRD system is part of the wider AXS ecosystem and is designed with the following compatibility constraints:
- Hydraulic Disc Only: Not compatible with rim brake frames.
- 12-Speed AXS Ecosystem: Must be paired with SRAM AXS 12-speed derailleurs and cassettes.
- DOT Fluid Only: Not cross-compatible with mineral oil systems (e.g., Shimano or Campagnolo).
- Flat Mount Standard: Designed for flat-mount caliper interfaces only.
Comparing to Leading Competitors
Shimano Ultegra R8170 Di2
Shimano’s Ultegra R8170 matches SRAM’s Force eTap AXS D2 in terms of electronic shifting and hydraulic braking but uses wired shifter-to-derailleur connections. Shimano retains mineral oil, which offers longer fluid life and slightly easier maintenance. However, SRAM’s full wireless setup and superior lever ergonomics give it an edge in clean builds and cockpit customization.
Campagnolo Ekar Disc
Campagnolo’s gravel-focused Ekar system uses mechanical 13-speed shifting and mineral oil disc brakes. It caters to a different use case but compares in terms of modulation. Ekar’s lever ergonomics are more niche, and compatibility is limited. SRAM provides greater ecosystem flexibility and electronic features.
Force AXS D1 vs D2
Compared to the previous D1 generation, the D2 model offers improved hood ergonomics, more responsive lever feel, and cleaner integration. Performance is similar, but the tactile upgrades and sleeker profile justify the upgrade for many riders.
FAQs
1. Can I use the Force eTap AXS D2 HRD levers with older SRAM hydraulic calipers?
No. Compatibility is restricted to current flat-mount SRAM calipers using DOT fluid.
2. How often should I bleed the brakes on Force D2 HRD?
Typically every 12–18 months, or sooner if lever feel degrades or pads/rotors are replaced.
3. Are the Force D2 HRD levers adjustable for smaller hands?
Yes. Reach adjustability is included and allows ergonomic tuning for various hand sizes.
4. Do I need a smartphone to set up Force AXS?
While the AXS app is recommended for setup and updates, the system can be manually paired and used without it.
5. Can I run 140mm rotors front and rear?
Yes, if your frame and fork allow it. Lighter riders often choose 140mm to save weight.
6. Are there different pad options for Force D2 HRD?
Yes. SRAM offers organic and sintered pads. Third-party options are also available, but ensure they are compatible with SRAM flat-mount calipers.
Conclusion
The SRAM Force eTap AXS D2 HRD brake system represents a thoughtful evolution of wireless braking technology, delivering refined ergonomics, powerful modulation, and seamless integration within the AXS ecosystem. Compared to its competitors, the D2 HRD system excels in wireless simplicity and rider-specific customization, making it a compelling choice for serious road cyclists. With proper setup, maintenance, and optimization, this brake set will perform reliably across a variety of riding conditions.