In most cases if a Leclerc Friction Brake starts slipping, there are two areas of suspect. 1) the linkage(connection to the Brake Circle) needs adjusting, or 2) the surface of the Brake Drum has lost its Braking surface(become smooth over years of use or a lubricant has gotten on the
surface) and needs to be scored or roughened up .

Both of these you can do.

Over the years, Leclerc has designed varius configurations of Brake assemblies for the Nilus for varius application. All utilized either a Cord or Turnbuckle and Lever Linkage.

If you send me a little background on your Loom(a model number would be ideal) we can determine what configuration of Brake you are useing and determine a remedy.

MORE INFORMATION:

FRICTION BRAKE ON A LECLERC LOOM

    The friction brake permits a fine adjustment on the warp tension. It is particularly appreciated on a fine material and on fibers without elasticity such as linen and cotton.

    It has a flat wire band, called a wire brake circle, wound several times around a metal drum which is attached to the end of the warp beam.

    One end (the one close to the frame) is attached directly to the loom. The other end is attached to a coil spring which pulls it straight down. The greater the pulling power applied to the wire brake circle the stronger the brake action.

IMPORTANT:
When putting the brake circle on the drum, do not attempt to uncoil it or disturb its coil in any way. If uncoiled or bent, the brake will not operate properly.

    To install or remove the warp beam from the loom, insert or extract the brake drum from the wire circle.

    It is also important to check the wire brake circle to insure that none of the coils overlap each other and that they are all in their proper place on the brake drum. These items are critical to the proper operation of the brake.

    When you stand near the brake (right side of the loom), the beam must turn clock-wise but lock completely counter-clock-wise.

    On older looms or on those which have had excessive use, you may find that the brake does not hold properly. This is usually caused by dirt, lint or grease on the wire circle and brake drum. The metal parts should be cleaned with a cleaning solvent. NEVER PUT GREASE, oil or any type of lubricant on the brake system, as it will cause it to slip.
If the brake still does not hold properly, check if the brake drum is too smooth. If so, use a small flat file to score or roughen the surface of the brake drum to allow the wire circle to grip.

BRAKE CAN SLIP IF:
1) the installation is wrong.
2) brake drum is too smooth.
3) the wire circle is in bad condition (coil have to go around side by side).
4)  the spring coil is too old and has lost power.

In order to help you install it correctly, enclised is a drawing of most Friction Brake Systems used by Leclerc over the years. If you have another set up or have more questions, do not hesitate to contact me:

Francois Brassard
Leclerc looms
leclerc@leclerclooms.com