BENDIX BW1578 ユーザーズマニュアル

4

3

5

6

8

BUTTON ROLL 

PIN

PANEL 

MOUNTING

NUT

7

9

3.  Remove the two machine screws (2) and remove the 

lower cover (3).

4.  Remove the inlet-exhaust valve (4) and piston (5).
5.  Remove o-rings (6 & 7) from piston.

1.  An accurate test gauge should be tee’d into the supply 

line as a means of controlling the supply pressure 
provided. Apply a 120 psi air source to the supply port. 
A small volume reservoir (e.g. 90 cu. in.), with a gauge, 
should be connected to the delivery port.

2.  With 120 psi supply pressure, and the button pulled out 

(exhaust position), leakage at the exhaust port should 
not exceed a 1” bubble in 5 seconds; at the plunger 
stem a 1” bubble in 5 seconds. There should be no 
leakage between the upper and lower body.

3.  Push the button in (applied position). Leakage at 

the exhaust port should not exceed a 1” bubble in 
3 seconds; at the plunger a 1” bubble in 3 seconds. 
(The RD-3

™

 valve will have to be manually held in this 

position.)

4.  Reduce the supply pressure. At a pressure from 60 to 

20 psi, depending on the spring installed, the button 
should pop out automatically, exhausting the delivery 
volume. (This does not apply to the RD-3

™

, PP-8

™

 or some 

PP-1

®

 valves).

Block and/or hold the vehicle by a means other than air 
brakes and drain all reservoirs.

1.  Drive the button roll-pin out with a punch and remove 

the button.

2.  Mark each air supply line and its port for easy 

reinstallation, then disconnect them.  Remove the valve 
from the panel by removing the panel mounting nut.

1.  Install the valve in panel, securing with the panel 

mounting nut.

2.  Reconnect the air lines using marks made during 

removal as a guide.

3.  Install the operating button. Secure the operating button 

by installing the button roll pin.

1.  Remove the two cap screws (3) which retain the lower 

cover and remove the cover. Remove the sealing ring 
(4).

2.  Insert a small punch through the roll pin hole in the stem 

and remove the locknut (5).

3.  Remove the inlet-exhaust valve (6) and plunger (7) and 

spring (8), if any.

4.  Remove o-ring (9) from plunger.

1.  Perform same operations as for PP-1

®

 valve.

2.  Remove the inlet seal (10), shown in Figure 4, from 

lower cover. Remove the ring diaphragm (4) from the 
inlet seat.

3.  Remove piston (11) and o-ring (2).

1.  Insert a small punch through the roll pin hole in the 

plunger and remove the locknut (1) from the plunger.

2.  Withdraw the plunger and remove the spring (9) and 

o-ring (8).

Bendix

®

 

Valve

Automatic 

Exhaust

Momentary 

Apply

Pilot Trip 

Feature

Non-

Automatic

PP-1

®

20, 30, 40 

or 60 psi

-

-

-

PP-2

™

40 psi

-

-

-

PP-5

™

40 psi

-

18 psi

-

RD-3

™

-

Must be held manually

-

-

PP-8

™

-

-

-

Will remain in 

either position