The ABC hydraulic self-leveling suspension is the single most-discussed weak point on the R230. It rides superbly when healthy but develops leaks (struts, hoses, tandem pump, accumulators/spheres, valve blocks) as it ages, and full repairs are widely cited in the $5,000-$8,000 range. …
ABC (Active Body Control) hydraulic suspension: the defining risk
Mercedes-Benz SL (R230) · mechanical