Spare parts to keep your Lewis LH4 brakes running in top condition.

LH4 / LHP-S4 Service Kit — G1 (no marks on the lever)

For LH4 Lever and Caliper without any mark on the lever body.

• 1x Piston (Lever #15)
• 1x Modified piston sleeve (for LHT and LH4)
• 1x Front lever piston O-ring (Lever #16)
• 1x Rear lever piston O-ring (Lever #17)
• 1x Circlip (Lever #19)
• 2x Oil port O-ring (Lever #5)
• 2x O-ring on the sleeve
• 1x Diaphragm (Lever #7)
• 1x Spring (Lever #14)
• 1x Caliper O-ring between clamshells (Caliper #14)
• 2x Caliper piston O-ring (Caliper #5)
• 2x Caliper piston O-ring (Caliper #4)

LH4 / LHP-S4 Service Kit — G2 (a/a1)

For LH4 brakes with an X / a / a1 / X0 mark on the lever.

• 1x Piston (Lever #15)
• 1x Modified piston sleeve
• 1x Front lever piston O-ring (Lever #16)
• 1x Rear lever piston O-ring (Lever #17)
• 1x Circlip (Lever #19)
• 2x Oil port O-ring (Lever #5)
• 2x O-ring on the sleeve
• 1x Diaphragm (Lever #7)
• 1x Spring (Lever #14)
• 1x Caliper O-ring between clamshells (Caliper #14)
• 2x Caliper piston O-ring (Caliper #5)
• 2x Caliper piston O-ring (Caliper #4)

Lewis LH4 Parts covers replacement service items for Lewis LH4 hydraulic disc brakes, including lever, piston, seal, and hardware options as available. These parts help riders and shops keep LH4 brakes serviceable after crashes, wear, or regular maintenance. Use genuine Lewis components when rebuilding or refreshing a Lewis brake system.