Brake Valve Service - BRADEN PD12C Series Installation Maintenance And Service Manual

The BRADEN brake valve is a reliable hydraulic valve
with internal components manufactured to close
tolerances. Due to the close tolerances and mating of
components, the valve housing, spool, piston and
check poppet are not available as replacement parts.
Before disassembling the brake valve, be sure you
have conducted all applicable troubleshooting
operations and are certain the brake valve is causing
the malfunction.
Thoroughly clean the outside surfaces of the valve and
work in a clean dust free area, as cleanliness is of
utmost importance
components.
19 17 18
DRAIN
PORT
8 7
2 10

BRAKE VALVE SERVICE

when servicing hydraulic
SECTION A-A
22 3
1
A
A
12
4
"BR" PORT
9
SAE -4 ORB
(7/16-20 THD)
BRAKE VALVE ASSEMBLY
ITEM DESCRIPTION
1 Valve Housing (NSS)
2 Check Valve Retainer (NSS)
3 Spring Retainer (NSS)
4 Plug (NSS)
5 Spool (NSS)
6 Damper Piston (NSS)
7 O-Ring
8 Check Valve Poppet (NSS)
9 Pilot Orifice
10 Check Valve Spring
11 Spool Spring
12 O-Ring
13 O-Ring
14 O-Ring
15 Back-up Ring
16 Back-up Ring
17 Check Ball (1/4 in.)
18 Check Ball Spring
19 Elbow Fitting
22 Shim
NSS - NOT SERVICED SEPARATELY. REPLACE
COMPLETE VALVE ASSEMBLY
12
DISASSEMBLY
6
11
14
16
1. Remove the pilot orifice from the brake release
13
(BR) port using a 5/32 in. Allen wrench.
15
5
2. Remove the elbow fitting, motor drain check ball
and spring.
3. Remove the spool spring retainer and spool spring.
Check spring free length. Replace spring if less
than 1 15/16 in. (49.2 mm) long.
– 32 –
QTY.
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
A.R.