View larger

BMW Z4 (E89) 2009-2016 Single Top Hydraulic Cylinder Rebuild

New product

Send us your convertible top hydraulic cylinder and we will rebuild and upgrade it to better than new condition!

If sending multiple cylinders, please select the quantity below.



Almost all high-end convertibles today use old technology to seal the hydraulic cylinders.

The shelf lifetime of the OEM Polyurethane seals most frequently used is about ten years. Heat, water, and additives can even accelerate that decay!

Top Hydraulics, Inc. uses Viton™ and Teflon™-hybrid seals, as well as advanced PU seals which far exceed the OEM's requirements for rigidity, but provide between twice and ten times the service life, based on scientific test data - our warranty proves it. The standard warranty on our rebuilds is 3 years. In some cylinders, Top Hydraulics, Inc. may exchange as many as five seals that are not O-rings (and never should be), plus the hydraulic port seals where the hydraulic hoses connect.

Some of our upgrades include replacing interior parts with precisely machined ones that allow us to use seals of superior quality, material, size, and geometry. Top Hydraulics, Inc. is the largest remanufacturer of convertible top cylinders. Replacing your leaking cylinders will buy you the original problem back - Top Hydraulics' upgrades get you a product that is far better than new...

Top Hydraulics, Inc. also offers rebuild services for most modern convertible top hydraulic pumps, and Top Hydraulics manufactures NEW, high pressure hydraulic top hoses for most brands. At 23,200 PSI, the burst pressure of the new hoses typically exceeds ten times the peak operating pressure in your top, while keeping the hoses at the same diameter as the original ones - interior Kevlar-reinforcement makes this possible...