BENDIX E-15 Manuel - Page 4

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PLUNGER

SUP-1

SUP-2

FIGURE 8 - BALANCED POSITION

BALANCED: SECONDARY CIRCUIT PORTION

When the air pressure on the secondary side of the relay

piston approaches the pressure being delivered on the pri-

mary side of the relay piston, the relay piston moves closing

the secondary inlet valve preventing further air flow from the

supply line through the valve. The exhaust remains closed

as the secondary delivery pressure balances the primary

delivery pressure.

SUP-1

SUP-2

FIGURE 9 - RELEASED MODE

FORCE

DEL-1

DEL-2

EXHAUST

PLUNGER

FORCE

DEL-1

DEL-2

EXHAUST

RELEASING: PRIMARY CIRCUIT PORTION

When the force on the brake treadle is released, the me-

chanical force is removed from the graduation spring (8) and

the primary piston (2). Air pressure in the delivery circuit

moves the primary piston exhaustive valve, allowing air pres-

sure in the primary piston to exhaust through the exhaust

port.

RELEASING: SECONDARY CIRCUIT PORTION

When the brake treadle is released, air is exhausted from

the primary circuit side of the relay piston through the bleed

passage. Air pressure in the delivery side of the secondary

circuit moves the relay piston upward, opening the second-

ary exhaust valve allowing air pressure in the secondary

delivery line to exhaust out the exhaust port.

PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing

any intrusive maintenance procedures. An extended war-

ranty may be voided if intrusive maintenance is performed

during this period.

Because no two vehicles operate under identical conditions,

maintenance and maintenance intervals will vary. Experi-

ence is a valuable guide in determining the best maintenance

interval for any one particular operation.

Visually check for physical damage to the brake valve such

as broken air lines and broken or missing parts.

EVERY 3 MONTHS, 25,000 MILES OR 900 OPERATING

HOURS:

1. Remove any accumulated contaminates such as dirt

and gravel from the heel of the treadle (26), plunger (27)

plunger boot (28) and mounting plate (29).

2. Use a light oil, lubricate the treadle roller (30), roller pin

(31) and hinge pin (32).

3. Inspect the plunger boot (28) for cracks, holes or dete-

rioration and replace if necessary. Also check mounting

plate and treadle for integrity, wear and corrosion and

replace or repair as necessary.

4. Apply 2 to 4 drops of oil between plunger and mounting

plate - do not over oil!

5. Check for excessive leakage as described in the

Operation & Leakage Checks section of this manual.

EVERY YEAR, 100,000 MILES, OR 3,600 OPERATING

HOURS:

1. Perform steps 1 through 4 above.

2. Perform the operation and leakage checks described in

the Operation & Leakage Checks section of this manual.