B
38
Repair and Service Manual
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
699322
Parts Replacement vs. Repair
Some maintenance or repair tasks can take considerable
labor to do correctly. Assessment of the condition of worn
components is critical to the operation of the brake sys-
tem. In some cases, component replacement may be
more cost effective than the removal, cleaning, inspection
and reassembly of the component(s).
Adjusting Brake Pedal Free Travel
Brake pedal free travel MUST be
checked and adjusted any time that
the brake system is serviced or
when parts are replaced.
Brake pedal free travel is the distance the pedal travels
from rest to the point at which the brake cables start to
move the brake levers. This should not be confused with
the light resistance that is felt as the brake pedal is
pressed enough to remove slack from the compensator
and cables. Correct adjustment of free travel is essential
to proper brake function. Too much pedal free travel will
limit braking capability. Too little pedal free travel may
cause the brakes to drag (not fully released). Either con-
dition can prevent the brakes from adjusting properly.
This procedure is intended to adjust
the brakes and seat brake system
components. The brake system may
not be effective for the first few applications of the
brake pedal.
1.
Pre-adjust service brake pedal free travel to the cor-
rect setting by loosening the jam nut and adjusting
the spherical nut (Figure 17). Tighten the jam nut to
10 - 11 ft. lbs. (14 - 15 Nm).
Figure 17 Free Travel Adjustment
2.
The brake pedal free travel should be set to 7/8" - 1
1/8" (2.2 - 2.9 cm).
3.
Press the brake pedal aggressively 4 - 6 times to
establish known free travel.
All brake tests must be done in a
safe location with regard for the
safety of all personnel.
4.
In a safe location free from people and vehicles,
drive the vehicle at reduced speed and apply the
brakes aggressively. As the brakes adjust and stop
the vehicle, start driving at maximum speed and
brake aggressively 10 times.
5.
At the spherical nut, adjust the free travel as noted
above.
6.
Drive again and brake aggressively 10 times.
7.
Repeat the previous step(s) until the pedal free travel
does not change during the aggressive braking.
8.
Check to see that the clevis pins attaching the brake
cables to the brake levers are loose (Figure 18). If
they are not loose, inspect system again and correct
as required.
9.
If the clevis pins are loose, tighten jam nut to 10 - 11
ft. lbs. (14 - 15 Nm) at the spherical nut.
Figure 18 Check Clevis Pins
10. The parking brake latching force can be checked as
verification after setting brake pedal free travel. To
check parking brake latching force, place a ‘bath-
room’ scale on the service and parking brake pedals.
Using both feet press the scale down against the
parking brake pedal until it latches. The parking
brake should latch between 65 and 75 lbs. (29 - 34
kg) indicated on the scale (Figure 19).
Spherical Nut
Jam Nut
7/8" - 1 1/8" (2.2 - 2.9 cm)
Check for loose
clevis pin
Содержание LS2 2020
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