Fail Safe Hydraulic Brake

Fail safe hydraulic brake is be sure that the braking force is activate when require.

Fail safe brake

During normal operation hydraulic pressure keeps the discs within the brake case separated, allowing shaft rotation. If hydraulic pressure is lost, springs force the discs together, stopping rotation of the winch drum.  This brake is a fail safe multi disc type

Therefore I will mention and show the function of the mechanical brake

  • For a hydraulic cylinder brake a powerful spring  mounted inside cylinder acting onto the brake bands installed on the outer surface of rotating motor housing or directly mounted on the drum shaft;
  • For the multi disc brake a spring forces acting on discs by hydraulic pressure. I meet different arrangement, depends of the application.  The brake housing is install on top of the gearcase of hydraulic motor or can be a different part, brake unit installed separate or opposite to the hydraulic motor.

Hoisting winch hydraulic brake repair of one of the deck crane

Winches and slew machinery are equip with a fail safe brake. In case of hose or pipe failure or pressure drops suddenly the brakes are automatically apply.

In a diagram the brake is represent as shown.  Can be seen the hydraulic line is connected to the piston rod end. That means when hydraulic pressure is build the spring is push and the piston of the brake cylinder retract. Therefore braking force is release and the hydraulic motor can do his designated work.  In this case is brake bands install

Fail safe brake – Green line highlighted for brake

The hydraulic brake is control by the 3/2 directional control valve, solenoid operated spring return with the hydraulic supply from feed pump circuit.

The post is filled under Hydraulic Diagram

Have a comment about this topic! Share it here!


I'm the technical person behind the website My website is my portfolio where a share most of my experiences and know-how gain so far in electro-hydraulic systems.

We will be happy to hear your thoughts

Leave a reply

Register New Account