Section 12: BRAKE AND AIR SYSTEM
PA1562
24
Excessive leakage on brake service side:
• With the primary air system at normal
operating pressure (95 - 125 psi (655 -
860 kPa)) and foot brake applied, coat all air
line connections and brake pneumatic
components with a water and soap solution.
Bubbles will indicate an air leak, and none
should be permissible. Repair or replace
defective parts.
• Listen for leaks and correct as required.
• Redo test to check all items repaired or
replaced.
IMPORTANT NOTE
To maintain your vehicle’s air disc brakes at
their original performance standard, we
strongly recommend use of only genuine,
approved service replacement parts on Bendix
and Knorr-Bremse air disc brake systems. If
non-approved friction materials or
replacement components are used, neither
Prévost Car nor Bendix Spicer Foundation
Brake LLC will accept any air disc brake-
related warranty returns or claims.
For more information on this policy, refer to
Bendix-Prévost product notification annexed
at the end of Section 12 of Maintenance
Manual.
30. BRAKE AIR CHAMBER
If this vehicle is equipped with Knorr-Bremse
SN7000 disc brakes on all axles, it also uses
“Knorr-Bremse” brake chambers. The drive axle
chambers consist of two separate air chambers,
each having its own diaphragm and push rod.
They are used as a service brake chamber, an
emergency brake in case of air pressure loss
and a spring-applied parking brake. Refer to
figures 42 and 43.
The front and tag axlea brake air chambers are
used only for service brake duty (Fig. 42.
FIGURE 42: FRONT AXLE BRAKE AIR CHAMBER 12158
30.1 MAINTENANCE
Every 6,250 Miles (10 000 km) or twice a year,
whichever comes first depending on type of
operation:
FIGURE 43: DRIVE AXLE BRAKE AIR CHAMBER 12126
Check all hoses and lines. They should be
secure and in good condition.
Every 100,000 Miles (160 000 km) or once a
year, whichever comes first depending on
type of operation:
1. Disassemble and clean all parts.
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