Lewis AE 4 Piston Hydraulic Bicycle Disc Brake Kit

Lewis AE Axial Cylinder Brake Set

Firm lever feel, powerful monoblock braking, and premium CNC construction at a more accessible price point.

The Lewis AE is designed for riders who want a strong, immediate brake feel with premium materials and serious stopping power. Built around a one-piece monoblock CNC caliper and an axial master cylinder, the AE delivers a direct, solid lever feel with the kind of control and consistency aggressive riders look for in trail, enduro, and downhill braking.

Lewis developed the AE for riders who prefer a firmer, more substantial lever character. Compared with a lighter, more progressive brake feel, the AE gives stronger feedback at the lever and a more immediate bite point. For riders who like a more decisive braking response, the AE is built to feel powerful, planted, and confidence-inspiring on steep terrain.

Why the Lewis AE Stands Out

• Monoblock CNC Caliper: The AE uses a one-piece monoblock 7075-T6 aluminum caliper instead of a more common two-piece design. This helps reduce caliper flex and supports more direct, consistent braking power.
• Axial Master Cylinder: The axial cylinder layout creates a crisp, responsive engagement point with a firm lever feel that many aggressive riders prefer.
• 4-Bearing Lever Pivot: The lever rides on 4 sealed cartridge bearings rather than basic bushings, helping improve smoothness, reduce lever play, and support long-term durability.
• Asymmetric 4-Piston Layout: The caliper uses 2 x 14 mm and 2 x 17 mm stainless steel pistons to balance initial control with strong overall stopping power.
• Premium CNC Finish: Precision-machined construction gives the AE a higher-end look and feel than many brakes in the same category.
• Mineral Oil System: Designed around mineral oil operation for riders and mechanics who prefer that brake fluid platform.

Ride Feel & Performance

• Firm, substantial lever feel
• Strong initial bite with solid feedback
• Consistent braking under heavy use
• Well suited for trail, enduro, and downhill riding

The Lewis AE is a strong choice for riders who want a brake that feels direct and decisive at the lever while still offering the refinement of CNC construction, sealed lever bearings, and a rigid monoblock caliper.

Mechanic's Note: Pad Compatibility

The Lewis AE uses the Hope Tech 3 E4 pad shape, also referenced in the Lewis lineup as TP-37 / LP-37. This makes replacement pad sourcing easier and provides access to a broad range of pad compounds.

Configuration

These brakes are sold in the following standard configuration:

• Left Lever: Front Brake (90 cm hose)
• Right Lever: Rear Brake (165 cm hose)

Note: The levers use a flip-flop design. Riders running moto-style brake setup can swap hose positions to reverse the configuration.

What’s in the Box?

• Front and rear AE caliper + lever assemblies (pre-bled)
• Mounting hardware (stainless bolts and washers)
• 2 hose fittings / olives for shortening hoses
• Bleed blocks
• Lewis brake pads (pre-installed)

Specifications

• Product Name: Lewis AE Axial Cylinder Brake Set
• Intended Use: Enduro / Trail / Downhill
• Master Cylinder: Axial
• Lever Feel: Firm
• Pistons: 4 x Stainless Steel (14 mm + 17 mm)
• Caliper Material: Monoblock CNC 7075-T6 Aluminum
• Fluid: Mineral Oil
• Adjustment: Tool-Free Reach Adjust
• Pad Compatibility: Hope Tech 3 E4 / Lewis VP-37 / Lewis TP-37 / Lewis LP-37
• Hoses: Braided (T150 Front / T200 Rear)
• Weight: Approx. 220 g per side (lever + caliper)

Ideal For

The Lewis AE is ideal for riders who want a firm-feeling 4-piston mountain bike brake with strong power, premium CNC construction, and easier replacement pad sourcing. It is especially well suited for aggressive trail riders, enduro racers, downhill riders, and anyone looking for a brake with a more direct, Shimano-like bite character in a premium package.