The piston seals are manufactured from a special rubber which is frozen and then CNC machined with a ‘U’ profile which is specifically for hydraulic use. In addition, the piston itself is guided by a unique piston guide, to prevent wear and maintain correct alignment within the slave unit. This ultimately gives a smoother lever action and prolongs the product’s lifespan. This is a non-serviceable part. Any service or rebuild should be conducted at Oberon’s factory in the UK.