Freightliner Century Class. Manual — part 28
aged. See Group 42 of the Century Class Trucks
Workshop Manual for grease seal replacement in-
structions.
42–06 Dana Spicer, Haldex,
and Gunite Slack
Adjuster Lubrication
IMPORTANT: Perform
before lubri-
cating the slack adjusters.
Automatic slack adjusters that have a grease fitting,
must be lubricated periodically to ensure proper
brake operation.
WARNING
Failure to lubricate slack adjusters could lead to
dragging brakes or a brake failure, resulting in
property damage, personal injury, or death.
Dana Spicer and Haldex
NOTICE
Do not use moly-disulfide-loaded grease or oil.
Both the life and reliability of the slack adjuster
will be reduced if this type of grease is used.
Lubricate the automatic slack adjuster at the grease
fitting. See
. Use standard chassis lubricant.
Gunite
For operating temperatures of –20°F (–29°C) and
higher, use Texaco Multifak EP-2 or Mobil Grease
No. 77.
For operating temperatures between –20°F (–29°C)
and –40°F (–40°C), use Lubriplate Aero grease.
Lubricate a Gunite automatic slack adjuster at the
grease fitting until grease appears on the camshaft,
or flows from the grease-relief. See
The newest Gunite automatic slack adjusters are
produced without a grease-relief. During lubrication
with a grease gun, lubricant is forced through the
drilled worm wheel onto the camshaft. Lubricate the
automatic slack adjuster at the grease fitting until
grease appears on the camshaft. See
42–07 Meritor Camshaft
Bracket Lubrication
IMPORTANT: Perform
before lubri-
cating the camshaft bracket.
NOTE: If equipped with an extended-
maintenance Q Plus
™
brake system, the cam-
shaft bracket will not have a grease fitting.
These camshafts use a special NLGI grade syn-
thetic polyurea grease and do not require lubri-
cation for 3 years or 500,000 miles (800 000
km), whichever comes first. The extended-
maintenance camshaft bushings are lubricated
during the brake reline service interval. For ser-
vice and lubrication instructions, see Group 42
of the Century Class Trucks Workshop Manual.
For camshaft brackets with grease fittings, use an
NLGI Grade 1 or Grade 2 multipurpose chassis
grease.
09/17/97
1
2
f421649
1.
Grease Fitting
2.
Slack Adjuster
Fig. 7, Dana Spicer and Haldex Automatic Slack
Adjuster
Brakes
42
42/7
Lubricate the camshaft bushings through the grease
fitting on the camshaft bracket or the spider until new
grease flows from the inboard seal. See
WARNING
If grease leaks out under the camhead, the cam-
shaft bracket grease seal is worn or damaged. See
Group 42 of the Century Class Trucks Workshop
Manual for grease seal replacement instructions. If
this seal is not replaced, the brake linings could
become contaminated with grease. The stopping
distance of the vehicle will be increased, which
could result in personal injury or property dam-
age.
42–08 Meritor Slack Adjuster
Lubrication
IMPORTANT: Perform
before lubri-
cating the slack adjusters.
NOTE: If equipped with an extended-
maintenance Q Plus
™
brake system, the slack
adjuster will not have a grease fitting. These
slack adjusters use a special NLGI Grade syn-
thetic polyurea grease and do not require lubri-
cation for 3 years or 500,000 miles (800 000
km), whichever comes first. The extended-
maintenance slack adjusters are lubricated dur-
ing the brake reline service interval. For service
and lubrication instructions, see Group 42 of
the Century Class Trucks Workshop Manual.
For slack adjusters with grease fittings, and for oper-
ating temperatures above –40°F (–40°C), use a
NLGI Grade 1 clay-base grease or a NLGI Grade 1
or 2 lithium-base grease.
For slack adjusters with grease fittings, and for oper-
ating temperatures below –40°F (–40°C) and above
–65°F (–54°C), use a NLGI Grade 2 synthetic oil,
clay-base grease.
Lubricate the slack adjuster at the grease fitting until
grease is forced past the pressure-relief capscrew, or
past the gear splines around the inboard snap ring.
See
42–09 Bendix E–6 Foot Contol
Valve Inspection and
Lubrication
1.
Remove the foot control valve from the vehicle.
See Section 42.03, Subject 110 of the Century
Class Trucks Workshop Manual for instructions.
2.
Remove the roll pin from the brake pedal pivot
pin. See
3.
Remove the brake pedal pivot pin.
4.
Remove the brake pedal.
5.
Check the brake pedal mounting plate adapter
for signs of wear or cracks at the bosses (the
area from which the pivot pin was removed). Re-
place it if necessary.
f420653a
1
2
3
4
5
6
7
8
10
9
10/27/93
1.
7/16-Inch Adjusting
Nut
2.
Grease Fitting
3.
Boot
4.
Link
5.
Brake Chamber Piston
Rod
6.
Clevis
7.
½-Inch Clevis Pin
8.
1/4-Inch Clevis Pin
9.
Grease-Relief
Opening
10. Slack Adjuster Spline
Fig. 8, Gunite Automatic Slack Adjuster
Brakes
42
42/8
6.
Check the brake pedal rollers for signs of wear
or cracks. Replace them if necessary.
7.
If the rollers are replaced, replace the roller pin,
then install a new cotter pin and bend it 90 de-
grees, and apply torque seal (OPG F900 White)
to the cotter pin.
8.
Remove the plunger from the valve. Using alco-
hol, clean the existing grease from the plunger.
Check the plunger for signs of wear or cracks.
Replace it if necessary.
9.
Lubricate the plunger with synthetic grease of
NLGI Grade 1.5, such as 76 Triton synthetic EP
Grease (FTL Sped 48-25432-000).
10. Insert the plunger in the valve.
11. Install the brake pedal and the pivot pin.
12. Install a new roll pin, and apply Torque Seal
(OPG F900 White) to the roll pin.
13. Install the foot control valve assembly. See Sec-
tion 42.03, Subject 110 of the Century Class
Trucks Workshop Manual for instructions.
14. Test the brakes before returning the vehicle to
service.
42–10 Brake Inspection
IMPORTANT: This procedure should be per-
formed prior to lubrication of the brake compo-
nents.
Parking Brake Operational Check
CAUTION
Perform the following check in a clear safe area. If
the parking brakes fail to hold the vehicle, per-
sonal injury or property damage may result.
1.
With the engine running, and air pressure at cut-
out pressure, set the parking brake.
2.
Put the vehicle in the lowest gear and gently at-
tempt to move it forward. The vehicle should not
move. If the vehicle moves, the parking brakes
are not operating correctly and must be repaired
before the vehicle is returned to service. See
Group 42 of the Century Class Trucks Workshop
Manual for repair procedures.
f420012a
10/20/93
1
2
3
4
5
6
7
1.
Brake Chamber
2.
Clevis
3.
Actuator Rod
4.
Boot
5.
Pressure-Relief Capscrew, Gasket, Pawl Spring,
and Pawl
6.
Manual Adjusting Nut
7.
Grease Fitting (or plug)
Fig. 9, Meritor Automatic Slack Adjuster
09/10/2004
f430405
1
2
3
4
6
7
8
5
1.
Foot Control Valve,
E-6
2.
Mounting Plate
3.
Nut and Washer
4.
Pivot Pin
5.
Roll Pin
6.
Roller
7.
Roller Pin
8.
Pedal
Fig. 10, Brake Pedal and Valve Assembly
Brakes
42
42/9
Brake Component Inspection
1.
Park the vehicle on a level surface, set the park-
ing brake, and chock the tires. Once the tires are
chocked, release the parking brake.
WARNING
Manually adjusting an automatic slack adjuster to
bring the pushrod stroke within legal limits is
likely masking a mechanical problem. Adjustment
is not repairing. Before adjusting an automatic
slack adjuster, troubleshoot the foundation brake
system and inspect it for worn or damaged com-
ponents. Improperly maintaining the vehicle brak-
ing system may lead to brake failure, resulting in
property damage, personal injury, or death.
2.
With the engine off, and 100 psi (689 kPa) of air
tank pressure, have an assistant apply and hold
an 80 to 90 psi (550 to 620 kPa) brake applica-
tion.
3.
Check to see if the colored over-stroke band on
each brake chamber pushrod is exposed.
If a band shows, the stroke is too long. Check
the foundation brake components for wear or
damage, and repair as needed. See Group 42 of
the Century Class Trucks Workshop Manual for
inspection, troubleshooting, and repair proce-
dures.
4.
Measure the applied chamber stroke. See
for the proper stroke for the type of
chamber being used. If the stroke is too short,
the brakes may drag or will not fully apply. Check
for improper operation or adjustment of the auto-
matic slack adjuster. See Group 42 of the
Century Class Trucks Workshop Manual for in-
spection and troubleshooting procedures.
5.
Start the engine and build air pressure to at least
100 psi (689 kPa). Shut down the engine.
6.
Check all of the foundation brake components for
damage, wear, and loose or missing parts. Re-
pair as needed. See Group 42 of the Century
Class Trucks Workshop Manual for repair proce-
dures.
Brake Chamber Stroke Specifications
Chamber
Max Applied Stroke: inch (mm)
Manufacturer
Type
*
Size
†
Gunite
Standard Stroke
9
1-3/8 (35)
12
16
1-3/4 (44)
20
24
30
2 (51)
36
‡
2-1/4 (57)
Long Stroke
16
2 (51)
20
24 (2-1/2 inch rated
stroke)
24 (3 inch rated
stroke)
2-1/2 (64)
30
Brakes
42
42/10
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