Replacing Brake Pads on Rival eTap AXS D1 HRD: A DIY Guide

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The SRAM Rival eTap AXS D1 HRD [paid link] is a hydraulic disc brake system designed for precise modulation and powerful stopping in road cycling conditions. Keeping the brake pads in optimal condition is essential for consistent braking performance and rider safety. This guide walks through every aspect of replacing the brake pads on this specific model, from preparation to fine-tuning.

Tools Required

  • 2.5mm hex wrench
  • Flat-blade screwdriver or brake pad spreader
  • Needle-nose pliers
  • Clean rag or paper towels
  • Isopropyl alcohol (minimum 90%)
  • Replacement pads (organic or metallic, SRAM-compatible)
  • Optional: SRAM pad retention bolt tool (if present)
  • Gloves (nitrile or latex to prevent contamination)

Understanding the SRAM Rival eTap AXS D1 HRD Brake Pad System

The Rival eTap AXS D1 HRD caliper uses a two-piece brake design with spring-loaded disc brake pads. It is compatible with both organic and metallic pads. Pad retention is handled by a small 2.5mm hex bolt and spring clip (depending on caliper variant), ensuring secure pad placement and simple removal.

Preparation and Safety Precautions

Before working on the caliper, ensure the bike is in a stable stand and the wheels are removed. Avoid touching the braking surface or pads with bare fingers. Use gloves and clean tools to prevent contamination. If any hydraulic service has recently been performed, allow time for air to dissipate from the system before brake work.

Removing the Worn Brake Pads

Start by removing the wheel to gain full access to the brake caliper. Use the 2.5mm hex wrench to unscrew the pad retention bolt. Carefully slide out the old brake pads, using needle-nose pliers if necessary. If the pads resist removal, gently spread the caliper pistons with a pad spreader to relieve pressure.

Inspect the worn pads for uneven wear or glazing. This can indicate improper caliper alignment or contamination. Note that minimum pad thickness should be no less than 1mm including the backing plate.

Cleaning and Inspecting the Caliper

With the pads removed, clean the inside of the caliper using isopropyl alcohol and a clean rag. Check the pistons for signs of leakage, debris, or sticking. Gently push the pistons back into the caliper using a spreader or plastic tire lever. Avoid using excessive force or metal tools that could damage the pistons.

Ensure the caliper is clean and dry before installing new components. This step is critical for achieving proper pad alignment and avoiding brake rub.

Installing New Brake Pads

Take the new pads and insert the spring clip between them if required. Slide the assembly into the caliper, aligning the pads with the pistons. Insert the pad retention bolt and tighten securely using the 2.5mm hex wrench. Be careful not to over-torque, as this can strip the threads.

Check that the pads move freely within the caliper and are seated evenly. Improper seating may lead to noise, reduced performance, or uneven wear.

Reinstalling the Wheel and Centering the Caliper

Once the new pads are installed, reinstall the wheel. Before squeezing the brake lever, ensure the rotor is properly seated between the new pads. Gently squeeze the lever a few times to allow the pistons to adjust to the new pad thickness.

If rubbing occurs, loosen the caliper mounting bolts slightly and squeeze the brake lever to center the caliper. Hold the lever while re-tightening the bolts. This ensures the caliper aligns correctly with the rotor and the pads engage evenly.

Bed-in Procedure for New Pads

A proper bed-in process is essential to ensure full braking power and longevity. Accelerate the bike to a moderate speed and perform 15–20 controlled stops with firm lever pressure. Allow the rotor to cool intermittently between braking cycles.

Avoid hard or emergency stops during the bed-in process, as this can glaze the pads or create uneven wear.

Maintenance Tips for Longevity

To maintain optimal braking, periodically inspect the pads for contamination, wear, or damage. Clean the rotor with isopropyl alcohol during regular maintenance intervals. Avoid spraying degreasers or lubricants near the caliper area.

Always store your bike in a clean, dry area to prevent corrosion or brake fluid degradation.

Troubleshooting Common Issues

Brake Rub After Installation

  • Ensure the rotor is true and the wheel is fully seated in the dropouts.
  • Re-center the caliper if the rotor rubs against one pad.
  • Check for sticky pistons or misaligned pads.

Squealing or Noisy Braking

  • Clean the rotor and pads with alcohol.
  • Verify that the pads are not contaminated with grease or fluid.
  • Perform a new bed-in procedure if noise persists.

Spongy Lever Feel

  • Confirm that the wheel and rotor are installed correctly.
  • If still spongy, consider performing a full hydraulic bleed of the Rival eTap AXS system.

Optimizing Pad Performance for Riding Style

SRAM offers both organic and metallic pad options. Organic pads are quieter and offer better modulation, ideal for road cyclists in dry climates. Metallic pads provide greater heat resistance and wear life, suited for aggressive riders or wet environments.

Select the pad compound that matches your terrain and braking style. Always replace both pads in the caliper simultaneously for balanced performance.

Compatibility with Other SRAM Drivetrain Components

The Rival eTap AXS D1 HRD caliper uses the same pad standard as other SRAM road hydraulic brakes like Force and Red. This allows cross-compatibility for pads across SRAM’s eTap AXS road range. However, always verify pad model numbers before installation to ensure proper fit.

Comparing Rival eTap AXS D1 HRD Brake Pads with Other Models

Compared to SRAM Red or Force calipers, the Rival HRD offers slightly less adjustability but uses the same pad retention system. Unlike some Shimano or Campagnolo calipers, SRAM’s design makes pad replacement easier without removing the entire caliper.

Riders looking for weight savings or tool-free pad replacement may prefer Force or Red, but for reliable stopping at a competitive price point, the Rival D1 HRD is hard to beat.

Conclusion

Replacing brake pads on the SRAM Rival eTap AXS D1 HRD is a straightforward task with the right tools and technique. Regular maintenance ensures consistent performance, safety, and extended lifespan of braking components. Following the outlined procedure and using compatible parts will result in smooth, quiet, and reliable braking every ride.