A rocker arm for an internal combustion engine, said rocker arm comprising a cavity with a cavity wall at least partially accommodating a lash adjustment piston for hydraulic lash adjustment, said rocker arm further comprising a lash stop surface, at least a portion of said lash adjustment piston being adapted to abut said lash stop surface during at least one operating condition of said rocker arm, said cavity comprising a lash adjustment chamber at least partially delimited by said lash adjustment piston, said rocker arm further comprising a control fluid conduit and a valve assembly located between said lash adjustment chamber and said control fluid conduit, as seen in an intended direction of flow from said control fluid conduit to said lash adjustment chamber, said valve assembly being such that: - for a first fluid pressure range (ΔP 1) wherein a fluid pressure in said control fluid conduit is equal to or lower than a first predetermined threshold pressure level (P 1), said lash adjustment piston can move relative to said cavity wall in at least a direction towards said lash stop surface; - for a second fluid pressure range (ΔP 2) from and including a low second predetermined threshold pressure level (P L2) to and including a high second predetermined threshold pressure level (P H2), said low second predetermined threshold pressure level (P L2) being greater said first predetermined threshold pressure level (P 1), said lash adjustment piston is prevented from moving relative to said cavity wall in at least a direction towards said lash stop surface, characterized in that: - for a third fluid pressure range (ΔP 3) wherein the fluid pressure in said control fluid conduit exceeds a third predetermined threshold level (P 3), said third predetermined threshold level (P 3) being greater than said high second predetermined threshold pressure level (P H2), said lash adjustment piston can move relative to said cavity wall in at least a direction towards said lash stop surface. - for a first fluid pressure range (ΔP 1) wherein a fluid pressure in said control fluid conduit is equal to or lower than a first predetermined threshold pressure level (P 1), said lash adjustment piston can move relative to said cavity wall in at least a direction towards said lash stop surface; - for a second fluid pressure range (ΔP 2) from and including a low second predetermined threshold pressure level (P L2) to and including a high second predetermined threshold pressure level (P H2), said low second predetermined threshold pressure level (P L2) being greater said first predetermined threshold pressure level (P 1), said lash adjustment piston is prevented from moving relative to said cavity wall in at least a direction towards said lash stop surface, characterized in that: - for a third fluid pressure range (ΔP 3) wherein the fluid pressure in said control fluid conduit exceeds a third predetermined threshold level (P 3), said third predetermined threshold level (P 3) being greater than said high second predetermined threshold pressure level (P H2), said lash adjustment piston can move relative to said cavity wall in at least a direction towards said lash stop surface. - for a third fluid pressure range (ΔP 3) wherein the fluid pressure in said control fluid conduit exceeds a third predetermined threshold level (P 3), said third predetermined threshold level (P 3) being greater than said high second predetermined threshold pressure level (P H2), said lash adjustment piston can move relative to said cavity wall in at least a direction towards said lash stop surface.