Gearbox Switching

M22x1.5

29.5 + 5 ft-lb
(40 + 7 N•m)

25

Energy Outlet
Suspension

M22x1.5

29.5 + 5 ft-lb
(40 + 7 N•m)

26

Tractor Spring
Brakes

M22x1.5

29.5 + 5 ft-lb
(40 + 7 N•m)

28.1

Tractor Spring
Brakes

M22x1.5

29.5 + 5 ft-lb
(40 + 7 N•m)

28.2

Tractor Spring
Brakes

M22x1.5

29.5 + 5 ft-lb
(40 + 7 N•m)

29.3

Trailer Supply

M22x1.5

18 + 3 ft-lb
(25 + 5 N•m)

4.3

Port for External
Release EPB
Tractor

M16x1.5

18 + 3 ft-lb
(25 + 5 N•m)

4.4

Port for External
Release EPB
Trailer

M16x1.5

18 + 3 ft-lb
(25 + 5 N•m)

4.6

Control Line
Detached Air Dryer

M16x1.5

18 + 3 ft-lb
(25 + 5 N•m)

4.7

Control Line to
Secondary Dryer
(CFL)

M16x1.5

18 + 3 ft-lb
(25 + 5 N•m)

4/29

Compressor
Control Line

M16x1.5

18 + 3 ft-lb
(25 + 5 N•m)

*Can be used as a tire filler
Table 1 – Air Connections

3

DISASSEMBLY
Core Module (Attached Variant)
NOTE: Identify and mark all connections on the core module
for ease of installation.
1. D
isconnect all air line connections from the core module
and air dryer.
2. Disconnect the electrical connector from the core module.
3. Remove and retain the five (5) M12 mounting bolts that
secure the air dryer and attached core module to the
vehicle.
4. To remove the air dryer from the core module, first remove
the air dryer cartridge to access the mounting bolts from
the air dryer to the core module.
5. Using an appropriate filter wrench, loosen the old air
dryer cartridge and remove it from the air dryer housing
by turning in a counter-clockwise direction. Be careful
not to allow dirt or other contaminants to fall into the air
dryer housing.
NOTE: If using a filter wrench, place the filter wrench on
areas A or B as shown in Figure 2 to avoid damage to
the cartridge. If a filter wrench is used in the middle of the
cartridge, damage may occur.

Figure 2 – Desiccant Cartridge Filter Wrench Placement

6. Once accessible, remove the carbon filter from the air
dryer body and discard.
7. Using a T-30 Torx® drive, remove the four (4) M6 mounting
bolts that secure the air dryer to the core module and
set them aside for reuse.

ASSEMBLY
Core Module (Attached Variant)

M6 Mounting
Bolts

1. Before mounting the air dryer to the core module, install
the seal (included in kit) into the seal groove of the air
dryer mounting surface. Ensure the orientation tabs are
located in the correct slots, and fully seat the seal into
the groove.

Seal

Figure 4 – Seal Installation

M6 Mounting
Bolts

Figure 3 – M6 Mounting Bolts

8. The air dryer can now be removed by pulling it away from
the core module, taking care to not damage the alignment
pins and the heater connection. Discard the existing seal
(a new seal is provided in this kit). See Figure 4.
9. Clean both mounting surfaces on the air dryer (between
the air dryer and the cartridge and between the air dryer
and the core module) with a clean cloth as the air dryer
will be reused.

2. Align the air dryer mounting alignment holes with the
alignment pins on the core module. Take care not to
damage the exposed heater connection pins.
3. Seat the air dryer to the core module. The heater pins
of the core module will engage with the air dyer heater
so long as the alignment pin features are used.
4. Secure the air dryer to the core module with the four (4)
M6 screws set aside during disassembly.
5. Using a T-30 Torx® drive, torque the air dryer to
the control module mounting screws to 71 in-lbs
(8 N•m) in a cross pattern.
6. Install the new air dryer cartridge and carbon filter per the
installation instruction S-1693, Bendix® GSAT® (Global
Scalable Air Treatment) Air Dryer Cartridge and Carbon
Filter Kits for Volvo® Trucks, which is shipped with the
replacement kit and can be found on B2Bendix.com.

Core Module (Detached Variant)
NOTE: Identify and mark all connections on the core module
for ease of installation.
1. Disconnect all air line connections from the core module.
2. Disconnect the electrical connector from the core module.
3. Remove and retain the three (3) M12 mounting bolts
that secure the core module to the vehicle.
4. Remove the core module.
Figure 5 – Carbon Filter Installation

4

7. Spin the air dryer cartridge onto the air dryer housing in
a clockwise direction until the seal makes contact with
the air dryer housing. Using an appropriate filter wrench
– if necessary – tighten the air dryer cartridge by ½ turn.
NOTE: Place the filter wrench only on areas A or B as shown
in Figure 2 to avoid damage to the cartridge.
8. Secure the core module to the vehicle using the five (5)
original M12 mounting bolts that were removed during
disassembly. Torque to 55 ft-lbs (75 N•m).
9. Connect all air line connections to the new core module
as marked during the disassembly process.
10. Reattach the electrical harness to the core module
connector interface; lock it into place with the integrated
tab.
11. Before placing the vehicle back into service, perform the
Required Programming and Operational Test.
Core Module (Detached Variant)
1. Secure the core module to the vehicle using the three
(3) M12 mounting bolts that were removed during
disassembly. Torque to 55 ft-lbs (75 N•m).
2. Connect all air line connections to the new core module
as marked during the disassembly process.
3. Reattach the electrical harness to the core module
connector interface; lock it into place with the integrated
tab.
4. Before placing the vehicle back into service, perform the
Required Programming and Operational Test.

REQUIRED PROGRAMMING
Before placing the vehicle in service, the Bendix® GSAT
(Global Scalable Air Treatment) system for Volvo® must be
programmed to the OE configuration to properly function.
1. Use the Volvo diagnostic tool to update the configuration
software per the Vehicle Identification Number (VIN).
2. When replacing the air dryer cartridge, the cartridge
lifetime wear and wetness content will need to be reset.
Use Bendix® ACom® Diagnostic Software, or a Volvo®
diagnostic tool, to initiate the cartridge reset routines.

5

OPERATIONAL TEST
Before placing the vehicle in service, perform the following
tests.
1. Close all of the reservoir drain cocks.
2. With the engine at 1800 rpm, build up system pressure
to system cut-out while observing that both the front axle
(secondary) and rear axle (primary) service reservoir
dash gauges rise equally in pressure from 0 psi (0 kpa)
to system cut-out. If either gauge fails to display this
condition, stop testing and check the installation. Note
that the GSAT system regenerates/purges with an audible
escape of air when system cut-out pressure is reached.
NOTE: The service reservoir pressures will drop during
regeneration/purge.
3. Fan down the service brakes to reduce system air
pressure to system cut-in. Note that the system – once
again – builds to full system pressure and is followed
by a regeneration/purge event at the GSAT air dryer
primary exhaust.
4. To verify proper park brake function, use the Hand Control
Unit (HCU) to release and apply the tractor park brakes
several times. The HCU and/or dash cluster should
illuminate, indicating a proper park state.
5. It is recommended that the following items be tested for
leakage to ensure the GSAT will not cycle excessively:
a. A
ir brake system (Refer to the Bendix® Air Brake
Handbook, BW5057, on B2Bendix.com)
b. C
ompressor unloader mechanism per manufacturer's
recommendation
c. GSAT core module
d. D
rain cock and safety valve in first (supply) reservoir
(if equipped)
e. A
ll air connections leading to and from the first
(supply) reservoir (if equipped)

TECHNICAL ASSISTANCE
For additional assistance, the Bendix Tech Team can
be reached by email at techteam@bendix.com or by
phone at 1-800-AIR-BRAKE (1-800-247-2725), option 2.
Representatives are available Monday through Thursday,
8:00 a.m. – 6:00 p.m., and Friday, 8:00 a.m. – 5:00 p.m. ET.

24/7/365 ACCESS
FULL SERVICE AT YOUR FINGERTIPS

1-800-AIR-BRAKE (1-800-247-2725)
TECHTEAM@BENDIX.COM

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Any references in this document to VOLVO, MACK, and any other company or trademark
are solely for identification and cross reference purposes.
Unless otherwise indicated, the trademarks used in this document, including Bendix,
are United States trademarks owned by, or licensed to, Bendix Commercial Vehicle Systems LLC.

6

S-1695 Rev 003 © 12/2025 Bendix Commercial Vehicle Systems LLC, a member of Knorr-Bremse • All Rights Reserved