Bendix Commercial Vehicle Systems MC-11 TRACTOR ANTILOCK 4/04 - Manual (Page 5)

5
1. Remove any accumulated contaminants and visually
inspect the exterior of the unit for excessive corrosion or
physical damage.
2. Inspect all air lines and wiring connected to the MC-11 ™
tractor antilock assembly for signs of wear or physical
damage. Replace as necessary.
3. Perform “LEAKAGE TEST.”
EVERY YEAR; 100,000 MILES; OR 3,600 OPERATING
HOURS
1. Perform “OPERATIONAL AND LEAKAGE TESTS.”
OPERATIONAL AND LEAKAGE TESTS
LEAKAGE TEST
1. Park the vehicle on a level surface and block the wheels.
Release the parking brakes and build the air system to
full pressure.
2. Turn the engine OFF and make 4 or 5 brake applications.
Note that the service brakes apply and release promptly.
3. Build system pressure to governor cut-out and turn engine
OFF.
4. Make and hold a full service brake application.
A. Apply a soap solution to the relay valve exhaust port.
A 1" bubble in 3 seconds is permitted.
B. Apply a soap solution to the outside of the modulator
body where the relay valve joins the solenoid
assembly. A 1" bubble in 3 seconds is permitted.
5. If leakage is excessive around the supply and exhaust
solenoids, replace the M-12 ™ modulator.
OPERATIONAL TEST
LED Operation
Although the MC-11 ™ assembly has self-check diagnostics,
the LEDs (Light Emitting Diodes) should be inspected to
ensure that they are functioning properly. With the vehicle
ignition on, hold a magnet (capable of picking up 3 ounces)
to the RESET position on the diagnostic window. All LEDs
should illuminate. If one or more of the LEDs do not
illuminate, and the dash light indicates proper system
function, note the nonilluminated LEDs for future reference.
Diagnostic capabilities will be limited, but the system will
continue to function as designed.
Solenoid Operation
The MC-11 ™ assembly monitors the system electronics upon
vehicle start-up. However, the vehicle should be tested to
verify proper solenoid function. Two technicians will be
required to properly test the solenoids.
1. Park the vehicle on a level surface and block the wheels.
Release the parking brakes and build the air system to
full pressure.
2. Turn the engine ignition key to the OFF position. Then
make and hold a full brake application.
FIGURE 5 - EXHAUSTING: NORMAL SERVICE APPLICATION
INLET SOLENOID
RESERVOIR
DOUBLE
CHECK VALVE
EXHAUST
SUPPLY
EXHAUST
SOLENOID
TRAILER
CONTROL
VALVE
BRAKE
VALVE
PISTON
CONTROL
DELIVERY
BRAKE
CHAMBER