Mercedes R129 SL-Class - Chapter 4 - Replacing the Rear Lock and Tonneau Cover Lift Cylinders

Is your Mercedes-Benz R129 SL convertible top leaking fluid, failing to latch at the rear, or stalling as the tonneau cover lifts? The rear lock cylinders and tonneau cover lift cylinders are common failure points — and when they leak, the top can't complete its sequence. The good news: you can replace them yourself. In this chapter, Klaus of Top Hydraulics walks you step-by-step through replacing the rear lock cylinders and the tonneau cover lift cylinders on the R129 SL with rebuilt and upgraded units engineered to outperform and outlast the originals. 🔧 What you'll learn: ✓ How to safely access and remove the rear lock and tonneau cover lift cylinders ✓ Proper handling to avoid fluid spills and damaged O-rings ✓ Installing your rebuilt/upgraded cylinders ✓ Getting your top latching, lifting, and sealing smoothly again 🔩 Parts referenced in this video: Rear Lock Cylinders — Mercedes P/N: 129 800 2172 ➡️ https://tophydraulics.com/r129-sl-97-... Tonneau Cover Lift Cylinders — Mercedes P/N: 129 800 2072 ➡️ https://tophydraulics.com/r129-sl-97-... ⚠️ Found a leak from one of these cylinders? It must be rebuilt or replaced to restore your top's function — a leaking cylinder won't hold pressure and will keep your top from operating correctly. Why upgrade instead of replacing with OEM? Our rebuilt cylinders use advanced Viton™ and Teflon™-hybrid seals designed for a 30–50 year service life — far beyond the short lifespan of factory polyurethane seals — all backed by our 3-year warranty. We even replace the port seals where the hydraulic lines enter the cylinder, something most DIY kits don't address. ▶️ Watch the complete R129 SL series here:    • Mercedes R129 SL-Class - How To Replace Th...   🛠️ Order parts and find more useful info: https://www.tophydraulics.com 💬 Questions about your R129 SL? Drop them in the comments or reach out through our site. We're happy to help. 👍 If this video saved you time and money, give it a like and subscribe for more DIY convertible top hydraulic repair guides. #TopHydraulics #MercedesR129 #R129SL #MercedesSL #ConvertibleTop #HydraulicCylinder #DIYRepair