Engineered for aggressive mountain biking, the Lewis LH4 hydraulic disc brake set combines high-precision CNC-machined 7075-T6 aluminium construction with a powerful four-piston architecture. It features an asymmetric piston configuration of 14mm and 17mm stainless steel pistons, balancing hydraulic pressure to deliver smooth, predictable modulation and immense stopping force when descending steep trails. Supported by bearing pivots and a lightweight one-finger lever design, it reduces hand fatigue during long, technical descents while offering elite-tier performance.
Designed with rider customisation in mind, the system integrates a patented dual adjustment system for tool-free lever reach and precise bite-point tuning. The mineral oil setup uses Kevlar-reinforced K28 hoses to maximize line stiffness, resulting in a firm, direct lever response. Finished with a sleek black anodised look and equipped with easy bleeding technology, these brakes provide reliable, top-tier performance for enduro, downhill, and all-mountain rigs.
CNC-Machined 7075-T6 Aluminium: High-strength alloy construction offers exceptional stiffness, durability, and a striking aesthetic finish.
Asymmetric 4-Piston Design: Combines 14mm and 17mm stainless steel pistons for balanced pressure distribution and powerful braking control.
Patented Dual Adjustment: Allows tool-free lever reach adjustments and fine-tuning of the bite point using a 2 mm Allen key.
Discipline: Enduro, Downhill, and All-Mountain
Material: CNC-machined 7075-T6 aluminium
Hydraulic Fluid: Mineral oil with Kevlar-reinforced K28 hoses
✅ Gravity and Enduro Riders: Delivers massive stopping power and fade resistance required for steep, technical descents.
✅ Custom Lever Feel: Bearing pivots and dual adjustments let you dial in the exact reach and bite point you prefer.
✅ Premium Build Quality: Exquisite CNC machining provides top-tier aesthetics and long-lasting durability.
❌ XC and Lightweight Cross-Country: The heavy-duty 4-piston power and robust build add unnecessary weight for pure cross-country racing.
❌ Budget-Focused Builds: As a premium CNC-machined aftermarket brake set, it sits at a higher price point than entry-level hydraulic options.
❌ Rotor and Adapter Exclusions: Rotors and mounting brackets are sold separately, requiring additional purchases for a complete setup.
When bleeding your Lewis LH4 brakes, use the recommended EZMTB pro universal hydraulic bleed kit with high-quality mineral oil. Giving the levers a few gentle flicks while the bleed syringe is attached helps dislodge any trapped micro-bubbles in the bearing-supported master cylinder, ensuring a crisp, rock-solid bite point on the trail.
