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 . <EOS>