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Removal
1. Chock all tractor and trailer wheels and drain the air
system.
2. Mark the brake chamber for proper air line port
alignment for reassembly.
3. CAGE THE POWER SPRING following the steps
outlined in
"Caging the Power Spring" on
page 4-14
4. Disconnect the slack adjuster from the connecting
rod by removing the clevis pin
5. Mark all air service lines for proper reinstallation and
disconnect from the brake chamber.
6. Remove the brake chamber from the axle brackets.
Installation
1. CAGE THE POWER SPRING following the steps
outlined in
"Caging the Power Spring" on
page 4-14
2. Position the inlet ports by loosening the service
chamber clamp bands and rotating center housing
such that ports are located according to alignment
marks made during disassembly, then retighten the
clamp bands.
3. Position the breather hole in the downward facing
position by loosening the clamp bands on the spring
brake chamber and rotating the chamber housing
until the breather hold faces downward. Retighten
the clamp bands.
4. Remount the brake chamber on the axle brackets
and reconnect the air service hoses and the slack
adjuster connecting rod
IMPORTANT
Be sure the service line is on the service chamber
port and the emergency line is on the spring brake
port.
5. Check for leakage by charging the air system to a
minimum of 90 psi and applying soap suds to the
brake chamber and connections. If a growing bubble
is detected or bubbles are blown away, locate the
source of the leak and repair.
6. Ensure that the clamp band is properly seated and
tight before uncaging the power spring.
TABLE OF CONTENTS
(See Figure
4-12)
(See Figure
4-11)
MAINTENANCE AND LUBRICATION
Emergency Relay Valve
Maintenance
The Emergency Relay Valve should be disassembled,
cleaned, and lubricated by a trained technician
(See Table
4-2.).
WARNING
Repair or replacement of the relay/emergency
valve is a complex operation and should be
performed by trained service personnel. Contact
a Landoll authorized service center or the Landoll
factory for servicing.
Brake Assembly Maintenance
The brake assemblies should be inspected and adjusted
per interval described in
See Table
brake linings visually to locate the lining showing the
greatest amount of wear. The wheel and drum should be
removed and the linings replaced if the thinnest portion of
the lining is 3/8 in. (9.5 mm) or less. Do not allow the
linings to wear thin enough that the lining rivet contacts
the drum
(See Table
4-10.) Lubricate brake assembly
per
See Figure 4-1
and
See Table
ORIGINAL BLOCK LINE
NORMAL WEAR LINE
HEEL
Figure 4-10: Brake Lining Wear
WARNING
Do not allow grease to contact brake linings as
this could result in reduced braking performance.
4-2. Examine the
4-2.
TOE
4-15
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