35
www.valortrailers.com PHONE: 208-810-4900
Rev 05/20/2022
Whenever it becomes necessary to jack the trailer it is up to you to ensure that the
trailer or axle is supported securely. Use blocks or jack stands on solid ground, especially if
you are going to be working under the trailer.
Preventive Maintenance
1. Every three months or 25,000 miles check the condition of the foundation brakes, including
drums, shoes and linings, cams, rollers, bushings, etc.
2. Check for structural damage of the housing, worn clevis, worn clevis bushings and
condition of the boots for cuts or tears. Replace if necessary.
3. After allowing the brake drums to cool to room temperature, check for correct chamber
stroke as follows:
a. Measure the applied stroke. Using a ruler, measure the distance from the face of the air
chamber to the center of the large pin in the clevis. (Another method is to mark the shaft
where it exits the chamber). Make a 100-psi brake application and allow the chamber
pushrod to travel to its maximum stroke. Again, measure the distance from the face of the
chamber to the center of the large pin. The applied stroke is the difference between the two
measurements. If this distance is less than 2", then the slack adjuster is functioning
properly. If the applied stroke is more than 2", proceed with step b.
b. Measure the free stroke. Make the same two measurements as described above for
measuring the applied stroke, but instead of air pressure use a lever to move the slack
adjuster arm until the brake shoes contact the drum. This distance should be between
1/2"
to 5/8"
.
If the free stroke is good but the applied stroke is too long then there is a problem with the
foundation brake. Check the foundation brake for missing or worn components, cracked brake drums,
or improper lining to drum contact.
If the free stroke is less than
1/2"
, then a dragging brake can occur. Readjust the slack
adjuster manually as described below.
If the applied stroke is good but the free stroke is greater than the recommended distance
(
1/2" to 5/8"
), then a function test of the slack adjuster should be performed as described below.
Summary of Contents for 54TS
Page 5: ...4 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022...
Page 28: ...27 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022 Brake Drum Troubleshooting Chart...
Page 34: ...33 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022 Tire Wear Diagnostic Chart...
Page 37: ...36 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022...
Page 50: ...49 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022 24 26 27...
Page 52: ...51 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022 Section 3 2 Running Gear...
Page 53: ...52 www valortrailers com PHONE 208 810 4900 Rev 05 20 2022 Section 3 2 Running Gear...
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