Bendix Commercial Vehicle Systems E-14 DUAL BRAKE VALVE 3/04 - Manual (Page 3)

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air flow from the supply port to the delivery port. The exhaust
valve remains closed, preventing the escape of air through
the exhaust port.
BALANCED: SECONDARY CIRCUIT
When air pressure on both sides of the secondary piston
approach each other, the piston moves, closing the
secondary inlet valve and 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.
RELEASING: PRIMARY CIRCUIT
When the force on the brake pedal is released, mechanical
force is removed from the graduating spring and the primary
piston. Air pressure in the delivery circuit moves the primary
piston and opens the primary exhaust valve, allowing air
pressure in the primary circuit to exit through the exhaust
port.
FIGURE 4 - APPLYING - NORMAL OPERATION FIGURE 5 - APPLYING - FAILURE IN THE PRIMARY CIRCUIT
PLUNGER
FORCE
SUP-1
PEDAL FORCE
SUP-2
EXHAUST
DEL-1
DEL-2
AIR FLOW
PEDAL FORCE
PLUNGER
FORCE
SUP-1
SUP-2
EXHAUST
DEL-1
DEL-2
DEL-1
RELEASING: SECONDARY CIRCUIT
When the brake pedal is released, air is exhausted from the
primary circuit side of the secondary piston through the bleed
passage. Air pressure in the delivery side of the secondary
circuit moves the piston and opens the secondary exhaust
valve, allowing air pressure in the secondary delivery line to
exit through the exhaust port.
PREVENTIVE MAINTENANCE
Important: Review the warranty policy before performing
any intrusive maintenance procedures. An extended warranty
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. Experience
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.
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AIR FLOW
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