A valve actuation system comprises a cylinder deactivation controller operatively connected to and in fluid communication with intake and exhaust deactivators for at least one cylinder. The valve actuation system further comprises an engine braking controller operatively connected to and in fluid communication with the engine braking actuators for the at least one cylinder. A braking-dependent deactivator controller is disposed between and in fluid communication with the cylinder deactivation controller and the intake deactivators, and in fluid communication with the engine braking controller via a control input. The braking-dependent deactivator controller is configured, in a first state based on its control input, to permit hydraulic fluid flow in hydraulic fluid control passages for the intake deactivators when in a non-1.5-stroke engine braking mode and, in a second state, to vent the hydraulic fluid control passages for the intake deactivators when in a 1.5-stroke engine braking mode.

A valve actuation system comprises a cylinder deactivation controller operatively connected to and in fluid communication with intake and exhaust deactivators for at least one cylinder. The valve actuation system further comprises an engine braking controller operatively connected to and in fluid communication with the engine braking actuators for the at least one cylinder. A braking-dependent deactivator controller is disposed between and in fluid communication with the cylinder deactivation controller and the intake deactivators, and in fluid communication with the engine braking controller via a control input. The braking-dependent deactivator controller is configured, in a first state based on its control input, to permit hydraulic fluid flow in hydraulic fluid control passages for the intake deactivators when in a non-1.5-stroke engine braking mode and, in a second state, to vent the hydraulic fluid control passages for the intake deactivators when in a 1.5-stroke engine braking mode.

An engine brake for an engine, having a rocker shaft carrying rocker arms along a rocker shaft, has an eccentric mounted to the rocker shaft and couples one of the rocker arms to the rocker shaft to pivot eccentrically about the rocker shaft as the eccentric pivots. The eccentric may take a braked condition or an unbraked condition. An actuator is capable of pivoting the eccentric about the rocker shaft to move the eccentric from the unbraked condition to the braked condition. An anti-clatter assembly is movable from an active state associated with the unbraked position of the eccentric to an inactive state associated with the braked condition of the eccentric. The anti-clatter assembly provides to the eccentric a restraining force in the active state and a yielding force in the inactive state. The restraining force is greater than the yielding force. The restraining force is sufficient to impede the eccentric from pivoting about the rocker shaft in the unbraked condition. The yielding force is insufficient to impede pivoting of the eccentric in the braked condition.