Brake Chamber Stroke Specifications
Chamber
Max Applied Stroke: inch (mm)
Manufacturer
Type
*
Size
†
Dana Spicer
Long Stroke
16L
2 (51)
20L
24L
24LS
2-1/2 (64)
30LS
*
Long stroke design is indicated by a tag, or embossing, on the brake chamber.
†
Specifications are relative to a brake application with 80 to 90 psi (550 to 620 kPa) air pressure in the brake chambers.
‡
If type 36 chamber is used, slack length should be less than 6 inches.
Table 1, Brake Chamber Stroke Specifications
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 vehicle
Workshop Manual for repair procedures.
42–14 Hydro-Max
™
Brake
System Inspection
NOTE: The following instructions apply to Ben-
dix and Bosch Hydro-Max systems.
1.
Check the fluid level in the hydraulic brake fluid
reservoir. If needed, fill the reservoir up to the
bottom of the fill-neck. See
. Use only
heavy-duty brake fluid, DOT 3.
2.
Check all hydraulic lines and fittings for damage,
leakage, or looseness.
Replace damaged or leaking components, and
tighten loose fittings.
3.
Check the brake module for leaks. If leaks are
found, repair or replace the brake module. See
Group 42
of the
Business Class® M2 Workshop
Manual
for replacement instructions, or take the
vehicle to an authorized Freightliner dealer.
4.
Check the electrical connections and harnesses.
Make sure the connectors are fully seated and
the harnesses are not chafed or cut. Repair or
replace any damaged harness. Disconnect any
loose connectors and inspect the terminals for
corrosion. If corrosion is present, replace the ter-
minals. If corrosion is not present, reconnect the
connector.
5.
Check the fuse for the hydraulic brake booster
pump, as follows.
08/03/2015
f460513c
A
B
A. Open caps and check fluid level.
B. Fill to this level.
Fig. 10, Hydraulic Brake Fluid Reservoir (Bosch
reservoir shown, Bendix reservoir similar)
Brakes
42
Business Class M2 Maintenance Manual, November 2015
42/14
Property of American Airlines
