Lippert Components Disc Brake System For Trailers - Manual (Page 4)

CHART 1
A B
3500 lb. axle 3.250” 5.600”
5200 lb. axle 4.375” 5.600”
6000 lb. axle 4.375” 5.600”
7000 lb. axle 4.375” 5.700”
8000 lb. axle 4.500” 5.800”
Step 4 - Final installation:
1. Hub flange must be clean and smooth, remove rust, corrosion and burrs.
2. Using a straight edge or on a lathe be sure the hub is true. If not replace.
3. Rotor should fit perfectly to the hub face when assembled. Mount 3 wheel nuts and
torque to 10-20 ft./lb. for the short-term.
4. Spin assembly and note rotation, concentricity and runout.
NOTE: Excessive runout can be corrected by, “clocking” the rotor (i.e., remove the wheel nuts and
re-install the rotor 90º,180º, or 270º from the initial position to the hub. Be sure to mark
initial position for reference.
5. Fit caliper mounting bracket to assembly. Recommended locations- 3 o’clock position
on left side;9 o’clock position on right side. Torque caliper mounting bracket bolts per
axle manufacturer’s recommendations.
6. Set caliper with bleed screw pointing up. Torque caliper guide bolts to between
40-50 ft./lb.
7. Bleed system, remove the 3 wheel nuts.
8. Install ALL wheel nuts. When tightening wheel nuts in an alternating pattern such as
1-4-2-5-3 on 5 bolt hubs. When the bolt pattern is an even number, tighten opposite
pairs until complete. This process will help to insure the concentricity of assembly.
9. DO NOT use of power impact tools during re-assembly. Too much initial torque can
result in distortion of the assembly, which may increase runout.
NOTES: 1. Caliper seals, o-rings, etc., are installed silicone lubricant. Petroleum based lubricants
are not compatible with these seals and o’rings and will cause failure.
WARNING!
DO NOT USE PETROLEUM BASED GREASE!
2. This assembly uses a floating caliper. Paint will inhibit caliper movement on guide bolt
sleeves and on the caliper mounting bracket.
WARNING!
DO NOT PAINT!
Solenoid Reversing Valves
(FOR TRAILERS WITH SURGE BRAKES ONLY)
Utilizing surge brakes requires the use of a reversing valve. Disc brakes work equally well in
forward or reverse and the reversing valve allows for proper function.
Factory installed surge disc brake actuator’s installed as standard equipment. Surge brake
actuators without a solenoid reversing valve installed as standard equipment will require the valve
to be retro-fit. The solenoids are wired into the tow vehicle’s back-up light circuit. These solenoids
are found in two styles:
Normally Open - This solenoid valve is installed near the master cylinder, added inline.
Advantages
♦ Ease of installation; not time consuming.
Disadvantages
♦ In a downhill disposition, positive pressure will remain in the brake line. When the tow
vehicle is shifted into reverse and the reverse ights are energized, the solenoid
reversing valve traps the pressurized brake fluid and may result in failure to back up the
trailer.
♦ In the event the trailer abruptly contacts an obstruction, such as a curb or speed bump,
while in the process of backing up, force of this impact is transferred wholly to the
master cylinder piston and can easily damage a seal.
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