Building on the power of the incredible Hope E4 and V4 brake systems, Hope have honed and tweaked every millimetre of the new GR4 disc brakes to be even more power full, even more comfortable and even more rad!
With an all new lever design the smoothness of operation and power control is next level with a super light lever feel and power progression that gives ultimate control at the start of the lever throw and huge power at the end.
The massive 4 piston calliper delivers all that power with ease whilst maintaining heat dissipation plus they looks cool as heck!
The benchmark brake for Gravity and E-Bike use.
New cam mechanism designed to decrease the free lever stroke while maintaining feel and modulation in the braking zone
Piston movement – Additional secondary guide bush to keep the piston running perfectly straight to maintain super smooth piston movement.
Bleeding – A bleed port has been added to the master cylinder body to allow bleeding without removing the lid.
One piece machined calliper for reduced weight and increased stiffness
Four hybrid pistons allow smooth movement and excellent heat management
The largest pistons for the greatest power
The larger pistons increase the ratio of the brake by 6% when compared to Tech 4 V4 brake system
Improved calliper stiffness increases power and control
Not compatible with vented rotors
Revised bore cap design reduces width for more frame clearance
Choose this calliper for ultimate power in the most demanding applications
Need some help selecting the right brake mount? Read our guide here
A bleed port has been added to the master cylinder body to allow bleeding without removing the lid, simplifying and streamlining the process. The classic "open" bleed option is retained for the ultimate bleed.
The internal port design has been reworked to eliminate air pockets during bleeding and to support a more consistent bleed process.
Piston Movement
Roller bearing main pivot is carried over from Tech 4 along with sliding guide bush on the main piston.
Additional secondary guide bush keeps the piston running perfectly straight to maintain super smooth piston movement throughout the full lever travel.
Cam Mechanism
A new cam designed to decrease the free lever stroke while maintaining the feel and modulation in the braking zone — a key feature of the Tech 4 brakes.
The result is a slightly firmer feel at the bite point, followed by a gentle rise in power through the braking zone, further enhancing brake modulation.
