- More pronounced curvature at the end of the lever for greater control and safety during aggressive riding
- The new dimpled design improves comfort during intense braking and maintains grip in all weather conditions
- The new cam design reduces lever free play, while maintaining sensitivity and modulation during the braking phase
- Main pivot on a roller bearing
- 2 guide bushings keep the piston sliding perfectly smooth and linear
- The bleed port added to the brake master cylinder body allows bleeding without removing the cover
- Monoblock caliper design for the best rigidity-to-weight ratio
- Oversized pistons increase the brake lever ratio for superior power
- Optimized caliper rigidity helps improve lever feel and increase power
- Wider adjustment range for better compatibility with third-party hub and frame combinations
- The new caliper bore cap design reduces overall width for a smaller footprint and better frame compatibility.

GR4 brakes are not compatible with ventilated discs.