Hope Tech 4 EVO GR4 - The ultimate brake for e-bikes and aggressive riding
The Hope Tech 4 EVO GR4 is a four-piston disc brake designed for the most demanding disciplines: enduro, DH, and EMTB. It pushes the limits by combining maximum power, precise control, and absolute reliability in all conditions. Its high-end design and new optimizations make the GR4 the benchmark for riders who demand the best.
The master cylinder features a redesigned cam mechanism, reducing the lever's free stroke while preserving the legendary progressiveness of Hope brakes. The result: a firmer bite point, followed by a smooth, perfectly controlled power increase for safe and modulated braking on the steepest descents. The kinematics are supported by a main pivot on bearings and additional guide bushings, ensuring smooth piston movement throughout the stroke.
Three lever options are available (Standard, Power, Control) to match your riding style: Standard (the default option fitted on Tech 4 Evo brakes) for optimal balance, Power for maximum mechanical leverage, and Control for a closer-to-bar feel. All levers feature a new textured surface for better grip and comfort and allow independent adjustment of reach and bite point.
The one-piece machined caliper combines increased stiffness and reduced weight, housing four hybrid pistons for consistent power transfer and optimized heat management. Compared to the Tech 4 V4, the GR4 has larger pistons, increasing braking ratio by around 6%, delivering extreme power while retaining the Hope signature: modulation and reliability. The bleed system has been simplified with a new dedicated port, ensuring quick and effective maintenance while retaining full “open system” bleed capability.
Key features of the Tech 4 Evo GR4 brake
Extreme power: one-piece caliper with 4 hybrid pistons and increased surface for 6% more braking force vs. Tech 4 V4.
Exceptional modulation: new cam and optimized kinematics for total control.
Customizable ergonomics: three lever options (Standard, Power, Control) with independent reach and bite point adjustment.
Simplified maintenance: integrated bleed port and redesigned internals for perfect bleeding.
Hope’s durability and reliability: premium materials, high-precision machining, built to last.
Customization: several brake parts available in different colors to personalize your setup.
Tech 4 EVO master cylinder specifications
2014 T6 aluminum construction CNC-machined on 5-axis machines
New Tech 4 Evo design
New bleed system: no need to remove reservoir cap, bleeding via dedicated screw port
3 lever options available: Standard (default-installed), Power, Control (sold separately)
Standard lever version installed by default
New cam mechanism reducing stroke while preserving modulation
Firmer bite point
Main lever pivot mounted on bearings
Lever ratio increased by 6% compared to Tech 4
Split clamp design for easy installation
Compatible with Sram Matchmaker, Sram Pod, and Shimano I-SPEC EV shifter direct mount (adapters sold separately)
Reach and bite point adjustments via 2 external dials (tool-free)
Option to customize reservoir cap and adjustment dials with various colors from Hope (Black, Red, Blue, Orange, Silver…)
GR4 caliper specifications
One-piece 2014 T6 aluminum caliper CNC-machined on 5-axis machines
Mounting standard: Postmount 74 mm
4-piston caliper (2 x 18 mm and 2 x 17 mm) for uncompromised power
The reference brake for E-MTB and DH bikes
Stainless steel pistons with phenolic inserts for smoother movement and reduced maintenance
Option to customize bore caps and 90° hose connector in different colors from Hope (Black, Red, Blue, Orange, Silver…) – requires specific tool (HTTCTC)
Racing pads (Green) installed
To maximize caliper stiffness, this design does not allow the use of 3.3 mm ventilated rotors
