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
Hose specifications
Brake available in two hose options: - Standard Black - Braided
Grosse évolution du tech4, freinage puissant endurant, levier aux choix pour une meilleure sensibilité au toucher, purge simplifiée, le prix de la qualité, je recommande.
Grosse évolution du tech4, freinage puissant endurant, levier aux choix pour une meilleure sensibilité au toucher, purge simplifiée, le prix de la qualité, je recommande.