How To Install a Type-38 COMBISTOP Brake


Operating conditions

Before installing the failsafe KEB COMBISTOP Brake ensure the following conditions:

  1. Provide a suitable secondary friction surface. Plane friction surfaces made out of suitable cast iron or steel. The surface roughness should not exceed 25 µm. Avoid sharp-edged interruptions in the friction surface. If such a surface is not available a friction disc or flange can be used.
  2. The excentricity of the mounting hole circle to the shaft end shall not exceed following values: Size 02: 0,2mm; Size 03…06: 0.4mm; Size 07…10: 0.5mm.
  3. The angular deviation of the mounting surface to the shaft shall not exceed following values: Size 02…03: 0.04 mm; Size 04…05: 0.05 mm; Size 06…07: 0.06 mm; Size 08…10: 0.08 mm (in reference to the bolt diameter).
  4. The friction surfaces must be free from grease and oil.
  5. Humidity, aggressive fumes and similar things can cause the rusting in of the friction disc. In such cases rustproof friction discs are
    optionally available.
  6. The movement of the armature shall not be obstructed by objects substances that penetrate into the nominal air gap. If necessary, the protective rings (optionally) are to be used or other protective measures are to be taken.



  1. Mount the hub on the shaft and secure it axially. Absolutely avoid any damage to the hub and make certain that the hub cannot run against the 2nd friction surface. Considering the axial play of the shaft we recommend a distance of 0.5…1 mm.
  2. Slide the friction lining on the hub. Be careful not to damage the friction lining through misaligned or tilted attachment. The lining must slide easy on the hub.
  3. Attach the assembled magnetic system with head cap screws in doing so adjust the nominal air gap with a feeler gauge or by means of the adjusting spacers. We recommend screws of the strength class 8.8, which should be tightened with the torque recommend by the manufacturers.


Readjustment of Clearance


The nominal air gap becomes larger due to wear. To guarantee a trouble-free function the air gap should be readjusted when reaching the air gap.


Disconnect the brake from load to avoid an uncontrolled motion of rotation.

  1. Loosen the head cap screws.
  2. Adjust the air gap by turning the adjusting spacers. Please note that the adjustment is uniform at all points.
  3. Tighten the head cap screws again.
  4. Check the air gap again and, if necessary, repeat the procedure.


This procedure can be repeated as often as needed until the friction lining has reached the minimum permissible thickness. Then friction lining and friction surfaces must be renewed and refinished. For the complete list of permissible wear and air gap measurements please download the manual using the links at the bottom of this page.




  • This field is for validation purposes and should be left unchanged.