No-Squeal Warranty for Dual Disc Pneumatic Brakes

DFE is able to offer a no-squeal warranty because of a proprietary design feature that virtually ends routine squeal problems for users of Dover’s dual disc or single disc brakes.

The ‘fix’ comes after much research and cooperation with the dissatisfied brake customers of several manufacturers. This warranty is in addition to our standard warranty. It applies to brakes purchased after April 2, 1999.

The No-Squeal Warranty:
Dover Flexo Electronics, Inc. (DFE) warrants our dual disc and single disc tensioning brakes against annoying squealing noises when installed according to our instructions. This warranty shall be void if non-DFE parts are used in the brake or if the brake has been contaminated with liquid, solid, or powder applied to the brake discs or friction pads.

Conditions of Dual Disc Brake Installation for No-Squeal Warranty to be Valid

• The brake mounting surface must be rigid and strong enough so it doesn’t deflect when loaded by brake torque.

• The shaft must be straight. (Bent shafts cause disc runout.)

• The shaft must not have noticeable end-play.

• The shaft bearings must be in good condition, with no noticeable free-play or noise.

• The shaft diameter must be properly matched to the brake bore. (A loose fit can cause balance problems and disc runout.)

• The shaft must be perpendicular to the brake mounting surface to within .04"(1mm), measured at the end of the shaft.

• The set-screws fastening the disc-hub assembly to the shaft must be tight. The disc-hub assembly must not move on the shaft.

• The actuator plates must be centered between the discs and be parallel to the brake mounting surface.

• All mounting bolts must be tight.

• The friction surfaces of the discs and friction pads must be clean and free of oil or any other lubricant.

• The friction pads must installed with the friction surface against the disc, and the steel backplate against the air cylinder.