Lewis LV4 4 Piston Hydraulic Bicycle Disc Brake Kit

Lewis LV4 4-Piston Hydraulic Disc Brake Kit

Radial-cylinder precision, 4-piston power, and premium CNC construction for trail, enduro, and gravity riding.

The Lewis LV4 is designed for riders who want a firmer, more direct brake feel paired with the power of a modern 4-piston caliper. Built around Lewis’s radial master cylinder design and a lightweight CNC-machined lever body, the LV4 delivers fast engagement, strong feedback at the lever, and powerful stopping performance for demanding trail, enduro, and e-MTB riding.

Paired with a 4-piston caliper, the LV4 is built to deliver serious braking control without the excessive bulk of many gravity-oriented brake systems. The combination of a stiff lever architecture, large piston layout, and precision-machined aluminum construction gives riders a brake that feels responsive, planted, and powerful on steep terrain and sustained descents.

Key Features & Benefits

• Radial Master Cylinder Design: The Lewis Vertical design places the master cylinder in a radial orientation to create a more direct, responsive lever feel.
• 4-Piston Caliper Power: Built for stronger braking force and improved heat management compared with lighter-duty trail brake systems.
• Asymmetric Piston Layout: Uses 2 x 14 mm and 2 x 17 mm stainless steel pistons to balance smooth engagement with strong overall clamping force.
• Dual Adjustment: Features tool-free reach adjustment and bite point adjustment so riders can fine-tune lever position and brake feel.
• 4 Sealed Cartridge Bearings: Lever pivots on sealed bearings for smoother action, reduced play, and a more refined lever feel.
• CNC 7075-T6 Aluminum Construction: Precision-machined aluminum body and caliper provide stiffness, strength, and premium finish quality.
• Mineral Oil System: Designed around a mineral oil braking platform with Kevlar braided hoses.

Ride Feel & Performance

• Firm, direct lever response
• Strong braking power for aggressive riding
• Excellent control on steep descents
• Low-weight feel for a 4-piston brake system
• Well suited for trail, enduro, DH, and e-MTB use

The Lewis LV4 is a strong choice for riders who want a more immediate brake feel than a softer, more progressive system while still retaining the control and adjustability needed for technical terrain.

Mechanic’s Note: Pad Compatibility

The Lewis LV4 uses the Hope Tech 3 E4 pad shape, making replacement pad sourcing easier and giving riders access to multiple pad compound options.

Configuration

These brakes are sold in the following standard configuration:

• Left Lever: Front Brake (90 cm hose)
• Right Lever: Rear Brake (160 cm hose)

Note: For riders who want to use a moto-style brake setup (Left/Rear & Right/Front), you can swap the brake hose positions at the levers to reverse the configuration.

What’s in the Box?

• Front and rear LV4 caliper + lever assemblies (pre-assembled with brake line)
• Mounting hardware (stainless bolts and washers)
• Lewis brake pads

Specifications

• Product Name: Lewis LV4 4-Piston Hydraulic Disc Brake Kit
• Intended Use: Trail / DH / Trials / All-Mountain
• Master Cylinder: Radial (Lewis Vertical)
• Pistons: 4 x Stainless Steel (14 mm + 17 mm)
• Material: CNC 7075-T6 Aluminum
• Fluid: Mineral Oil
• Adjustments: Tool-free reach adjust and bite point adjust (Not tool free)
• Pad Compatibility: Hope Tech 3 E4 / Lewis VP-37 / Lewis TP-37 / Lewis LP-37
• Hoses: Kevlar Braided
• Weight: Approx. 597 g per pair with hoses

Ideal For

The Lewis LV4 is ideal for riders looking for a powerful 4-piston mountain bike brake with a firm lever feel, radial-cylinder response, and premium CNC construction. It is especially well suited for aggressive trail riders, enduro racers, DH riders, and e-MTB riders who want strong braking with a more direct character.