Bendix Commercial Vehicle Systems BP-R1 BOBTAIL PROP RELAY VALVE 6/09 - Manual (Page 6)

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FIGURE 10 - BP-R1 ™ BOBTAIL BRAKE PROPORTIONING RELAY VALVE
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30
31
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14
11
12
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4. Connect the tractor service and emergency “glad
hands” (hose couplings) to hose couplings that have
been plugged, or alternatively, to a trailer. Build the trac-
tor system air pressure to governor cut-out and make 4
to 5 full brake applications. Check the air
fi ttings at the
BP-R1 ™ valve for leakage. Tighten as needed.
5. With the trailer supply valve (dash control w/red oc-
tagonal button) and system park control (dash control
with yellow diamond button) activated for tractor/trailer
operation, apply, hold, then release the brakes several
times varying the application pressures while watch-
ing the reaction of the gauges installed on the BP-R1
™
valve. Check that a prompt application occurs and that
it can be held then promptly released.
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5
6
7
8
9
3
35
15
17A
18
23
20A
22
24
25
27
29
33
28
34
32
36
37
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BODY ......................................... 1
VALVE COVER ............................... 2
RETAINING RING
............................ 3
EXHAUST COVER ........................... 4
O - RING ........................................ 5
O - RING ........................................ 6
VALVE SPRING .............................. 7
VALVE RETAINER ........................... 8
VALVE ASSEMBLY .......................... 9
CAP SCREWS ............................. 10
O - RING ..................................... 11
O - RING ...................................... 12
RELAY PISTON ............................ 13
RETURN SPRING ......................... 14
RETAINING RING .......................... 15
DUST SHIELD ( IF FITTED ) ............... 16
EXHAUST PISTON ( ORIGINAL STYLE ) . 17
EXHAUST PISTON ( NEW STYLE ) ....17A
EXHAUST PISTON O - RING .............. 18
EXHAUST DIAPHRAGM ( IF FITTED ) .... 19
SERVICE PISTON ( ORIGINAL STYLE -
REQUIRED O - RING 21) .................. 20
SERVICE PISTON
(
NEW STYLE
-
DOES NOT REQUIRE O - RING ) ........20A
SERVICE PISTON O - RING ( IF FITTED ) 21
SPRING ..................................... 22
SPRING CAGE ............................. 23
BLEND BACK PISTON .................... 24
O - RING ...................................... 25
O - RING ...................................... 26
O - RING ...................................... 27
PROPORTIONING PISTON ............... 28
O - RINGS ................................... 29
RETAINING RING .......................... 30
O - RING ..................................... 31
INLET VALVE SEAT ....................... 32
INLET VALVE ............................... 33
VALVE SPRING ............................ 34
SEALING RING ............................ 35
EXHAUST COVER SCREW .............. 36
EXHAUST COVER ......................... 37
Note:
Early models
used a
Diaphragm(19),
Dust Shield(16)
Service
Piston(17), and
o-ring(21)
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15
17
19
16
18 20
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