To check the brake, a measurement is made of the air gap between magnet body and anchor plate, as well as the brake lining thickness.

Overview:

Due to the wear of the brake lining as the motor is braked, the brake rotor gradually becomes thinner. The anchor plate is thereby pressed ever further toward the brake rotor during braking and the air gap thus becomes wider. If the air gap has reached its maximum width, a gap limiter prevents the anchor plate from being pressed any further, thus ensuring that the anchor plate is reliably ventilated. When the gap limiter is employed, the braking effectiveness gradually lessens.

This is the point at which the air gap must be readjusted at the latest. If the minimum lining thickness has been reached, the brake rotor must be replaced.

If the width of the air gap is within the permitted range but usage behaviour leads to the expectation that the air gap will be wider than permitted before the next regular inspection, the air gap must be readjusted now.

   Unscrew the rib screws (3x) of the fan cover.

   Take off the fan cover.

   Remove the O-ring.

   Insert the feeler gauge next to one of the hexagon head screws in the air gap between magnet body and anchor plate and measure the distance.

   If the air gap has reached the maximum width of the operating range (1.1 mm), adjust the brake. See Setting the air gap on the brake.

If the width of the air gap is within the permitted range but usage behaviour leads to the expectation that the air gap will be wider than permitted before the next regular inspection, the air gap must be readjusted now.

   Repeat the steps for all hexagon head screws (3x).

   Clean the entire brake with compressed air.

   Disconnect the power supply of the magnet body.

   Release the hexagon head screws M6x70 (3x).

   Pull the magnet body from the motor shaft.

   Pull the brake rotor from the hub and from the motor shaft.

   Check the thickness of the brake lining with a calliper.

   If the brake rotor is thinner than 7.5 mm: replace the brake rotor. See Replacing the brake rotor on the drive.

The area (air gap) between the magnet body and the anchor plate is protected from dust by an O-ring. The O-ring must not become damaged or missing.

   Check the O-ring.

The O-ring must not be torn, dented or damaged in any other way, nor be missing completely.

   If the O-ring is damaged or missing, fit a new O-ring. See ABUS Service.

   Slide the brake rotor over the motor shaft onto the hub.

   Insert the O-ring.

   Attach fan cover.

   Screw in the rib screws (3x) of the fan cover.