Lippert Components Disc Brake System For Trailers - Manual (Page 6)

Troubleshooting
Can Not Back Up Surge Braked Trailer
Probable Cause Corrective Action
12 v. solenoid valve is inoperative. 1. Check tow vehicle back-up light circuit. Check
12 v. solenoid. (Should be able to hear a “click”
when 12 v. DC is applied to lead wire.)
2. Check connection to tow vehicle back-up light
circuit.
3. Check trailer ground connection (do not depend
on hitch ball connection to provide ground).
Trailer should have dedicated ground wire
connected to grounding lug.
Squeaking, Clatter or Chucking
Probable Cause Corrective Action
* This could be caused by a worn out shock Replace per manufacturer’s specifications.
absorber in the Surge Brake Actuator.
* The linkage and pivots on the brake actuator. Lubricate per manufacturer’s specifications.
Loose hitch ball. Inspect hitch ball and tighten or replace as required.
Loose hitch. Inspect hitch and tighten or repair as required.
Hitch ball worn or too small. Replace with properly sized and rated ball.
* A bent push rod in the shock absorber Replace per manufacturer’s specifications.
*A bent master cylinder actuating rod. Replace per manufacturer’s specifications.
* A damaged coupler assembly. Replace per manufacturer’s specifications.
Broken rotor. Replace rotor and check calipers.
* Low brake fluid level in master cylinder. 1. Fill and bleed brakes.
2. Replace or build actuator master cylinder.
Worn out caliper pads. Replace caliper pads and check rotors.
Leaky caliper. 1. Replace or rebuild calipers.
2. Clean other hardware.
Leaky wheel bearing grease seal. Replace grease seal and wheel bearings as
required. Pack wheel bearings. Re-bleed as
necessary. Clean other hardware.
Caliper/Mounting bracket bolts may be loose. Tighten to manufacturers specifications and/or
replace as necessary.
Spindle nut may be loose. Tighten to manufacturer’s specifications and/or
replace as necessary.
Lug nuts may be loose. Torque to manufacturers specifications and/or
replace as necessary.
One Brake Overheating, Side Pull, Poor Brake Performance
Probable Cause Corrective Action
Caliper piston not retracting. 1. Check for foreign material in brake line.
2. Corrosion between caliper and piston.
3. Check and rebuild or replace caliper.
Bleed system.
A bent guide bolt/caliper mounting bracket. Replace as required.
Side pull. Check wheel bearings, caliper, rotor, and replace as
required.
All Brakes Overheating, Poor Brake Performance.
Probable Cause Corrective Action
Foreign material in brake line. Flush and clean thoroughly. Re-bleed system.
Low hydraulic fluid level. Fill with new brake fluid per manufacturer’s
specifications. Bleed brakes to eliminate any
trapped air.
Broken or pinched brake lines. Replace or repair as required.
*Brake actuator frame damaged. Replace actuator.
Residual pressure in brake line. See pg. 6 Note 3 for Surge braked trailer.
Check operating manual for Electric Hydraulic
Actuators. Check wheel bearings, caliper, rotor, and
replace as required.
* For trailers with surge brake actuators