BENDIX E-10, E-6 User Manual
®
Bendix® E-6™ & E-10™ Dual Brake Valves
SD-03-817
TREADLE
MOUNTING
PLATE
BOOT
3/8” P.T.
PRIMARY
DELIVERY
3/8” P.T.
SECONDARY
DELIVERY
EXHAUST
FIGURE 1 - E-6™ DUAL BRAKE VALVE
3/8” P.T.
PRIMARY
SUPPLY
3/8” P.T.
SECONDARY
SUPPLY
DESCRIPTION
The E-6™ (Figure 1) and E-10™ (Figure 2) dual brake valves
are floor mounted, treadle operated type brake valves with
two separate supply and delivery circuits for service (primary) and secondary braking, which provides the driver with
a graduated control for applying and releasing the vehicle
brakes.
The E-10™ dual brake valve (Figure 2) is similar to the E-6
dual brake valve except that a metal coil spring housed in
an upper body assembly replaces the rubber spring used in
the E-6™ valve. The use of a metal coil spring (and the upper
body assembly) provides greater treadle travel and, therefore, provides the driver with a less sensitive "feel" when
making a brake application. The E-10™ dual brake valve is
generally used on buses, where smooth brake applications
contribute to passenger comfort.
The circuits in the E-6™/E-10™ dual brake valves are identified
as follows: The primary circuit is that portion of the valve
between the spring seat which contacts the plunger and the
relay piston; the secondary circuit is that portion between
the relay piston and the exhaust cavity .
TREADLE
MOUNTING
PLATE
3/8” P.T.
PRIMARY
DELIVERY
3/8” P.T.
SECONDARY
DELIVERY
3/8” P.T.
SECONDARY
EXHAUST
FIGURE 2 - E-10™ DUAL BRAKE VALVE
SUPPLY
The primary circuit of the valve is similar in operation to a
standard single circuit air brake valve, and under normal
operating conditions the secondary circuit is similar in
operation to a relay valve.
Both primary and secondary circuits of the brake valve use
a common exhaust protected by an exhaust diaphragm.
™
OPERATION
APPLYING: NORMAL OPERATION - PRIMARY
CIRCUIT PORTION
When the brake treadle is depressed, the plunger exerts
force on the spring seat, graduating spring, and primary
piston. The primary piston, which contains the exhaust valve
seat, closes the primary exhaust valve. As the exhaust valve
closes, the primary inlet valve is moved off its seat allowing
primary air to flow out the primary delivery port.
3/8” P.T.
PRIMARY
SUPPLY
1
15
25
16
18
19
17
26
34
7
8
1
2
28
33
31
32
30
911
FIGURE 3 - E-6™ DUAL BRAKE VALVE SECTIONAL
DIAGRAM
10
12
22
13
27
23
21
20
24
14
16
17
19
FIGURE 4 - E-10™ DUAL BRAKE VALVE SECTIONAL
DIAGRAM
18
4
5
6
APPLYING: NORMAL OPERATION SECONDARY CIRCUIT
When the primary inlet valve is moved off its seat, air is
permitted to pass through the bleed passage and enters the
relay piston cavity . The air pressure moves the relay piston,
which contains the exhaust seat and closes the secondary
exhaust valve. As the secondary exhaust valve closes, the
secondary inlet valve is moved off its seat allowing the
secondary air to flow out the secondary delivery port.
Because of the small volume of air required to move the
relay piston, action of the secondary circuit of the valve is
almost simultaneous with the primary circuit portion.
APPLYING: LOSS OF AIR IN THE SECONDARY
CIRCUIT
Should air be lost in the secondary circuit, the primary
circuit will continue to function as described above under
Normal Operation: Primary Circuit Portion.
APPLYING: LOSS OF AIR IN THE PRIMARY
CIRCUIT
Should air be lost in the primary circuit, the function will be
as follows: As the brake treadle is depressed and no air
pressure is present in the primary circuit supply and
2
delivery ports, the primary piston will mechanically move
the relay piston, allowing the piston to close the secondary
exhaust valve and open the secondary inlet valve and allow
air to flow out the secondary delivery port.
BALANCED: PRIMARY CIRCUIT
When the primary delivery pressure acting on the piston
equals the mechanical force of the brake pedal application,
the primary piston will move and the primary inlet valve will
close, stopping further flow of air from the primary supply
line through the valve. The exhaust valve remains closed
preventing any escape of air through the exhaust port.
BALANCED: SECONDARY CIRCUIT
When the air pressure on the secondary side of the relay
piston approaches that being delivered on the primary side
of the relay piston, the relay piston moves closing the
secondary inlet valve and stopping further flow of air from the
supply line through the valve. The exhaust remains closed
as the secondary delivery pressure balances the primary
delivery pressure.
When applications in the graduating range are made, a
balanced position in the primary circuit is reached as the air
pressure on the delivery side of the primary piston equals
the effort exerted by the driver's foot on the treadle. A
balanced position in the secondary portion is reached when
air pressure on the secondary side of the relay piston closely
approaches the air pressure on the primary side of the relay
piston.
When the brake treadle is fully depressed, both the primary
and secondary inlet valves remain open and full reservoir
pressure is delivered to the actuators.
RELEASING: PRIMARY CIRCUIT
With the brake treadle released, mechanical force is
removed from the spring seat, graduating spring, and
primary piston. Air pressure and spring load moves the
primary piston, opening the primary exhaust valve, allowing
air pressure in the primary delivery line to exhaust out the
exhaust port.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before per-
forming any intrusive maintenance procedures. A warranty
may be voided if intrusive maintenance is performed during
the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary . Experience is a valuable guide in determining the best maintenance interval for air
brake system components. At a minimum, the E-6
valves should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. Should
the E-6™/E-10™ valves not meet the elements of the operational tests noted in this document, further investigation and
service of the valve may be required.
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:
™
/E-10
™
RELEASING: SECONDARY CIRCUIT
With the brake treadle released, air is exhausted from the
primary circuit side of the relay piston. Air pressure and
spring load move the relay piston, opening the secondary
exhaust valve allowing air pressure in the secondary
delivery line to exhaust out the exhaust port.
™
DASH
MV-3
CONTROL
MODULE
TRAILER
CONTROL
VALVE
BRAKE
SLACK
ADJUSTER
GOVERNOR
CHAMBER
(E-6™ OR E-10™)
DUAL BRAKE
VALVE
AIR DRYER
Clean any accumulated dirt, gravel, or foreign material away
from the heel of the treadle, plunger boot, and mounting
plate.
Lubricate the treadle roller, roller pin, and hinge pin, with
Barium grease per BW-204-M (Bendix part 246671).
Check the rubber plunger boot for cracks, holes or deterioration and replace if necessary . Also, check mounting plate
and treadle for integrity .
Apply a thin layer of Barium grease, per BW-204-M (Bendix
part 246671), between plunger and mounting plate – do not
over oil!
TP-5™ TRACTOR
PROTECTION VALVE
SLACK
ADJUSTER
DOUBLE
CHECK
VALVE
SPRING
BRAKES
QUICK
RELEASE
VALVE
™
BP-R1
BOBTAIL
PROPORTIONING
VALVE
COMPRESSOR
FIGURE 5 - TYPICAL PIPING SCHEMATIC
SUPPLY
RESERVOIR
(WET TANK)
#1 SERVICE
RESERVOIR
#2 SERVICE
RESERVOIR
3
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