Lewis AX 4 Piston Hydraulic Bicycle Disc Brake Kit

Lewis AX 18/20mm 4-Piston Brakes — Built For DH & Enduro

Peak power. Total control. Zero compromises.
The Lewis AX brings downhill-level stopping power with an adjustable feel that you can fine-tune on the trail. Built from CNC-machined 7075-T6 aluminum and loaded with 18/20mm stainless steel pistons, this 4-piston system is engineered for riders who push limits—from enduro stages to bike-park laps.

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Why Riders Choose the AX

• Triple Adjustments: Tool-free reach & bite point + adjustable leverage ratio for customized modulation and power.
  
  
• DH-Ready Power: 4-piston system with 18mm + 20mm insulated stainless pistons for consistent performance under heat.
  
  
• Thermal Stability: Independent cooling fins improve heat dissipation on long descents.
  
  
• Upgraded Reliability: New anti-oil-loss connector and improved leverage adjustment knob.
  
  
• Premium Materials: 7075-T6 aluminum construction, stainless hardware, and braided T200 oil hose.

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Performance Adjustments

• Lever Reach Adjustment (Tool-Free)
  Quickly set the lever distance from the bar for the perfect fit and faster reaction time.
  
  
• Bite Point Adjustment (Tool-Free)
  Fine-tune lever free-play instantly—no tools needed.
  
  
• Leverage Ratio Adjustment
  Dial in your braking feel:
  • More modulation
  • More bite
  • More overall power
    
    
• Loosen the two set screws with a 1.5mm key, rotate the ratio knob, tighten the screws—done.

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Power & Consistency Under Heat

• 4-Piston System: Two 18mm + two 20mm pistons with insulation layers preserve power when the trail gets steep.
  
  
• Cooling Fins: Independent fin design improves thermal management for hard DH braking.

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Technical Specs

Master Cylinder

• Type: Axial
• Material: CNC 7075-T6 Aluminum
• Finishes: Black or Silver
• Clamp: Split clamp, Black or Silver
• Adjustments:
  
  • Lever Reach — Tool-Free
  • Bite Point — Tool-Free
  • Leverage Ratio — 1.5mm set-screw release
• Hardware: Stainless steel

Lever Blade

• Material: CNC 7075-T6 Aluminum
• Version: 1-Finger
• Colors: Black or Silver

Caliper

• Material: CNC 7075-T6 Aluminum
• Mount: Post Mount
• Pistons: 18mm + 20mm Stainless Steel
• Pads Included:
  • Sintered EP-44
  • Carbon Ceramic VP-40
• Color: Black or Silver

Brake Hose

• Braided T200 Mineral Oil Hose
• Size: 5mm OD / 2.2mm bore
• Lengths: 110cm Front, 180cm Rear
• Finish: Black

Weight

• Lever: 109g
• Caliper: 202g (without pads)
• Complete Single Brake (no pads/hose): 311g

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Compatibility

• Intended Use: Downhill, Enduro, All-Mountain
• Rotor Options (Not Included): 180 / 200 / 203 / 220 / 223 mm
  
  
• Recommended Rotors:
  • Lewis 2.3mm rotors
  • Compatible with any 2.0–2.5mm rotor
    
    
• Adapters: Not included
• Oil: Mineral
• Bleed Kit: Lewis Bleed Kit recommended

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The Lewis AX: Built for Riders Who Demand Power & Tunability

If you want a brake that matches downhill force with enduro adjustability, the AX delivers. Tuned feel, incredible modulation, and class-leading build quality—this is the upgrade that transforms your bike’s braking performance.