The Hope HBSPC41:TV4 complete seal kit is the official refurbishment solution for V4 calipers, whether mounted on Tech 3 V4 or Tech 4 V4 brakes. Designed and manufactured by Hope Technology in its British factory in Barnoldswick, this kit includes all necessary seals and caps to restore your caliper to its original braking performance. Intended for experienced mechanics and riders passionate about maintenance, it restores hydraulic sealing, eliminates leaks and guarantees optimal braking feel.

Complete kit composition

• 4 piston seals in total: 2 seals of 16 mm (small pistons) and 2 seals of 18 mm (large pistons), suited to the asymmetric four-piston architecture of the V4 caliper
• 2 O-rings for bore caps: one seal for the large piston and one for the small piston, ensuring bore cap sealing
• 1 rubber cap for bleed screw: effective protection against moisture and dust infiltration

Precise compatibility and standards

The HBSPC41:TV4 kit is specifically designed for Hope V4 calipers, which equip the Tech 3 V4 and Tech 4 V4 hydraulic brakes. These calipers use four hybrid stainless steel pistons with phenolic insert (2 pistons of 16 mm and 2 pistons of 18 mm), ensuring smooth movement and optimal thermal management. Compatible with DOT 5.1 hydraulic fluid, this kit requires one kit per caliper (allow two kits for complete front + rear braking).

Technical advantages and maintenance

• Restored sealing: prevention of hydraulic fluid leaks and pressure maintenance in the circuit for powerful and progressive braking
• Original Hope quality: seals manufactured in the United Kingdom according to Hope Technology factory standards, guarantee of durability and perfect compatibility
• Resistance to extreme conditions: high-performance materials resistant to high temperatures, climatic aggression (mud, water, thermal variations) and wear
• Reduced downtime: complete caliper refurbishment without requiring replacement of other components (pistons, caliper body)

Installation and recommendations

To ensure optimal installation, Hope recommends lubricating pistons and seals with silicone oil reference HTTHOPELUBE (or DOT 5.1 oil). Using a bore cap removal tool type HTTC-TC greatly facilitates disassembly and reassembly of bore caps without risk of damage. After installation, a complete system bleed is necessary to eliminate any air bubbles and restore firm lever feel. This lightweight kit (only 1.6 g) allows you to significantly extend the lifespan of your V4 calipers, making regular maintenance a sustainable investment for consistent braking performance.

Hope Technology expertise

Hope Technology has manufactured its hydraulic components in its Barnoldswick factory in England since 1989. Pioneer of MTB disc braking, the British brand designs, machines and anodizes all its parts in-house, from piston to caliper body, guaranteeing absolute quality control. The seals in the HBSPC41:TV4 kit reflect this requirement: rigorous dimensional precision, chemical and mechanical resistance, compatibility tested in real conditions. Choosing this official kit means opting for the reliability and longevity that have made Hope's worldwide reputation.