Frequently Asked Questions

Problem	Cause
Trailer Regulations	http://www.aaa.com/aaa/traveler/trailer.html
Excessive Surge Actuator movement or slow response (delay) from Electric/Hydraulic Actuator	Air in hydraulic system Hose swelling / Deteriorated flex hoses Fluid boil Badly worn pads Uneven pad wear Old or contaminated brake fluid Faulty master cylinder Master Cylinder mounting loose Clogged reservoir cap vent hole Soft or swollen caliper seals
Front or Rear Axle brakes locking prematurely	Too much front or rear brake bias Failure in opposite system Excessive wear in opposite system Worn tires Tire pressure too high Defective master cylinder Defective caliper
One brake locking / trailer pulls to one side	Caliper piston seizing Defective, damaged, or oil-contaminated brake pad on one side Defective caliper Scored or out-of-round rotor Bad caliper O-ring Loose caliper mount Mismatched rotors and pads Incorrect tire pressures Bad axle-end alignment Mismatched tires / load Damaged or crimped brake line/hose Loose suspension parts Loose caliper mounting bolts Incorrect wheel bearing adjustment
Vibrating Trailer while stopping	Excessive rotor run out or thickness variation Wheel bearing damaged, worn, or out of adjustment Cracked rotor Bent axle Caliper not sliding properly
No BRAKES!	Air in hydraulic system Leak in hydraulic system Tapered pad wear Electric current passing through brake fluid Lack of fluid in reservoir
Brakes grab	Contaminated pad linings Brakes wet
Brakes not releasing / Brake drag	Contaminated pad linings Brakes wet
Brakes squeal	Worn pads Brakes wet Glazed or contaminated pads Dirty or scored rotor Bent caliper bracket Taper wear on pads
Rapid pad wear	Brakes not releasing Bad surface finish on rotor Pads too soft Pad fade (inadequate cooling) Cracked/damaged/contaminated rotor

Problem

Cause