BENDIX MC-12 MODULATOR CONTROLLER ASSY Guia de Resolução de Problemas descarregar pdf (Página 62)

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Air Brake System Troubleshooting Tests (continued)

TEST 2

Leakage (reservoir air supply)

For additional information refer to video Assessing Air Brake System Air Leakage (BW2327 - CD)

Full pressure, engine stopped, parking brakes applied

Not

1. Allow the air pressure to stabilize for at least 1 minute.

Observe the dash gauge pressures for 2 minutes and note any pressure drop.

A. Pressure Drop: Single Vehicle

(A 4 psi drop within 2 minutes is allowable for either service reservoir)

B. Pressure Drop: Tractor/Trailer

(A 6 psi drop within 2 minutes is allowable for either service reservoir)

C. Pressure Drop: Tractor/2 Trailers

(An 8 psi drop within 2 minutes is allowable for either service reservoir)

Make all the necessary repairs before proceeding to test 3; see checklist 2 for common corrections.

CHECKLIST 2

If there is excessive leakage in the supply side of

the pneumatic system, one or more of the following

devices could be causing the problem:

NOTE: A leak detector or soap solution will aid in locating the faulty

component.

1. Supply lines and ﬁ ttings

2. Low pressure indicator(s)

3. Service brake relay valve(s)

4. Spring brake relay valve (where applicable)

5. Dual brake valve

6. Trailer hand control valve

7. Parking control valve

8. System safety valve(s) in the supply reservoir and/or air

dryer

9. Governor (may be mounted on the air dryer as illustrated, on

the compressor, or remotely).

10. Compressor discharge line

Retest to verify proper operation of all items repaired

or replaced.

Make and hold brake application. When ignition power is applied,

each modulator solenoid is brieﬂ y energized. If the air system is

fully charged and the service brake pedal is depressed during

ignition, the modulator creates a single, sharp audible “chuff” of

air pressure. The modulators are energized in a certain pattern,

as follows: right front, left front, right rear, left rear. This test is

performed only when the vehicle is stationary (if the vehicle

moves the chuff test will not be performed).

NOTE: The EC-60

™

controller will perform a PMV chuff test on all

installed modulators in the following order:

1. Steer Axle Right PMV

2. Steer Axle Left PMV

3. Drive Axle Right PMV

4. Drive Axle Left PMV

5. Additional Axle Right PMV

6. Additional Axle Left PMV

7. Drive Axle TCV

The pattern will then repeat itself.

See appropriate Service Data Sheet for repairs.

Make all necessary repairs before proceeding to

Test 4.

TEST 3

Pressure Modulator Valve and Traction Control Valve Chuff Test

Full pressure, engine stopped, parking brakes released

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 68 69 70

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