8-50
Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
Brake Free Play Measurement and Adjustment
The following procedure is required to ensure that the free
play of the brakes is within required values.
NOTE:
If the brake is equipped with a spring type parking
chamber the spring must be caged before taking
measurements.
1.
Chock the wheels and release the parking brakes.
NOTE:
Do not use an impact wrench on bolt.
For easier turning of the release bolt, apply 655 to
862 kPa (95 to 125 psi) air pressure to the air inlet
port marked “Spring”. After caging, completely
exhaust air from the spring chamber.
2.
Turn the integral release bolt counterclockwise using a
3/4 inch socket wrench (Figure 8-44), until the power
spring is fully caged or compressed. Full cage position
requires approximately 22 to 23 turns for 76 mm (3.00
in) stroke units.
3.
The dual thread release bolt which reduces the travel of
the release bolt by a factor of 2.4 in a 76 mm (3.00 in)
stroke unit, for instance, the parking spring is fully caged
when the release bolt is up approximately 33 mm (1.3 in)
from the run position (Figure 8-45). After caging,
completely exhaust air from the spring chamber.
7094-1
FIGURE 8-43
Free Stroke = B minus A
Applied Stroke = C minus A
A
B
(Fully Retracted)
(Brake Application at 621 to 689
kPa (90 - 100 psi) reservoir
pressure)
CAUTION
Damage Could Occur!
Do not exceed the length stated in step 3 and do not
exceed 68 Nm (50 lb) torque on release bolt at any time or
damage may occur which could prevent any further
correct manual release of the spring brake chamber.
7093-1
FIGURE 8-44
Fo
r
Reference
Only