SERVICE PROCEDURE
18506
June, 2018
SUBJECT:

SAFETY RECALL
Brake Air Line Routing on certain IC Bus® CE
Series school bus models built 25 December 2018
thru 01 February 2018 with feature code 04091
(dual air brake system) and 04AZS (Antilock Brake
System [ABS] with 4 channel Electronic Stability
Protection [ESP])

DEFECT DESCRIPTION
The roll stability valve air supply line may be incorrectly routed. This condition
does not affect normal brake operation. However, during a stability control
oversteer event and with slippery road conditions, the parking brakes may be
modulated unintentionally. Modulation of the parking brake during a stability
control oversteer event could lead to loss of control or a vehicle crash.

MODELS INVOLVED
This Safety Recall involves certain IC Bus® CE Series school bus models built 25
December 2018 thru 01 February 2018 with feature code 04091 (dual air brake
system) and 04AZS (Antilock Brake System [ABS] with 4 channel Electronic
Stability Protection [ESP]).

ELIGIBILITY
This procedure applies ONLY to vehicles marked in the International® Service
Portal℠ with Safety Recall 18506. Also complete any other open campaigns
listed on the Service Portal at this time.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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PARTS INFORMATION
Part Number
2017511C2
2015727C1
20990R1
2643441R2
1687803C1
4039319C1
25222R1 or
Source Locally
25519R1 or
Source Locally
120380 or Source
Locally
289862C1 or
Source Locally
306132C1 or
Source Locally

Part Description
FITTING, ELBOW QUICK CONNECT 90 DEGREE
1/4 NPT X 3/8”
FITTING, “T” QUICK CONNECT FLEX TUBE 3/8” F
X 3/8” F X 3/8”
FITTING, PLUG 3/8” NPT
HOSE, FLEX AIR NYLON, (3/8 OD-ORANGE)
EXTENSION, CLIP
GUIDE, HOSE AND CABLE, 2-WAY

Quantity
1
1
1
1
1
1

BOLT 1/4” X 3/4”

1

NUT, HEXAGON TYPE 8 1/4” UNC

1

WASHER, LOCK, 1/4" REG STEEL / ZNC 1/4”

1

STRAP, CABLE LOCK

2

STRAP, CABLE LOCK

1

SERVICE PROCEDURE
WARNING! To prevent property damage, personal injury, and / or death,
park vehicle on hard flat surface, turn the engine off, set the parking brake
and install wheel chocks to prevent the vehicle from moving in either
direction.
WARNING! To prevent property damage, personal injury, and / or death, if
the vehicle must be raised, do not work under the vehicle supported only
by jacks. Jacks can slip or fall over.
WARNING! To prevent personal injury and / or death, always wear safe eye
protection when performing vehicle maintenance.
WARNING! To prevent property damage, personal injury, and /or death,
allow engine / vehicle components to cool before servicing.
WARNING! To prevent property damage, personal injury, and / or death,
keep flames or sparks away from vehicle and do not smoke while servicing
the vehicle’s batteries. Batteries expel explosive gases.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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1. Park vehicle on flat surface.
2. Shift transmission to Park or Neutral and set parking brake.
3. Turn ignition to Key OFF position.
4. Install wheel chocks.

Figure 1. ATR-6 Brake Valve
1.
2.
3.
4.

Ladder extension
Cable tie strap
Airline
ATR-6 brake valve

5. Locate Antilock Traction Relay (ATR-6) brake valve (Figure 1, Item 4)
mounted on driver-side frame rail.
6. Remove cable tie strap (Figure 1, Item 2) securing airline (Figure 1, Item
3) located just above ATR-6 brake valve (Figure 1, Item 4).
7. Remove ladder extension (Figure 1, Item 1) and save fasteners for reuse.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

3

Figure 2. Cable Strap Configuration
1.
2.
3.
4.
5.
6.

Thin cable tie strap
Wide cable tie strap
Extension clip
Airline along frame
2-way hose and cable guide
T-fitting

8. Install new extension clip (Figure 2, Item 3) to frame rail using previously
removed fasteners and tighten.
NOTE: Do not tighten tie straps at this time.
9. Place two thin cable tie straps (Figure 2, Item 1) around each end of Tfitting (Figure 2, Item 6).
10. Insert wide cable tie strap (Figure 2, Item 2) through 2-way hose and
cable guide (Figure 2, Item 5), extension clip (Figure 2, Item 3), T-fitting
cable tie straps, and around airline along frame rail (Figure 2, Item 4).
11. Tighten all cable tie straps, cut and discard strap ends.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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Figure 3. ATR-6 Valve Line and Fitting Removal
1.
2.
3.
4.
5.
6.
7.

ATR-6 brake valve
Control port
3/8-inch fitting
ORANGE 3/8-inch airline
Steer axle delivery port
3/8-inch elbow
ORANGE 3/8-inch airline

12. Disconnect ORANGE 3/8-inch airline (Figure 3, Item 7) from 3/8-inch
elbow (Figure 3, Item 6) of ATR-6 steer axle delivery port (Figure 3, Item
5).
13. Remove and discard 3/8-inch airline elbow (Figure 3, Item 6) from ATR-6
steer axle delivery port (Figure 3, Item 5).
14. Disconnect ORANGE 3/8-inch airline (Figure 3, Item 4) from 3/8-inch
fitting (Figure 3, Item 3) of ATR-6 control port (Figure 3, Item 2).
15. Remove and discard 3/8-inch fitting (Figure 3, Item 3) from ATR-6 control
port (Figure 3, Item 2)

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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Figure 4. ATR-6 Valve Port Connections
1.
2.
3.
4.
5.
6.
7.

T-fitting
12.6-inch length 3/8-inch ORANGE airline
90-degree elbow
Control port
3/8-inch plug
Steer axle delivery port
ATR-6 brake valve

Note: Always assemble Dryseal American Standard Taper Pipe Thread
fittings into internal thread until hand tight and then an additional 1 1/2
to 2 revolutions. Do not back off (loosen) fitting.
16. Install 3/8-inch plug (Figure 4, Item 5) into ATR-6 steer axle delivery port
(Figure 4, Item 6) until hand tight.
17. Tighten plug 1 1/2 to 2 full revolutions.
Note: Always assemble Dryseal American Standard Taper Pipe Thread
fittings into internal thread until hand tight and then an additional 1-1/2
to 2 revolutions. Do not back off (loosen) fitting.
18. Install 90-degree elbow (Figure 4, Item 3) to ATR-6 control port (Figure 4,
Item 4) until hand tight.
19. Tighten fitting 1 1/2 to 2 full revolutions.
VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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20. Install one end of 12.6-inch (320 mm) length 3/8-inch ORANGE airline
(Figure 4, Item 2) into 90-degree elbow (Figure 4, Item 3) on ATR-6
control port (Figure 4, Item 4).
21. Install remaining end of 12.6-inch (320 mm) length 3/8-inch ORANGE
airline (Figure 4, Item 2) into 3/8-inch T-fitting (Figure 4, Item 1).

Figure 5. T-Fitting Airlines
1. 3/8-inch ORANGE airline
2. T-fitting
22. Install two 3/8-inch ORANGE airlines (Figure 5, Item 1) previously
removed in Steps 12 and 14 into each end of 3/8-inch T-fitting (Figure 5,
Item 2).
23. Verify there are no air leaks when brake pedal is depressed.
24. Remove wheel chocks.

END OF SERVICE PROCEDURE
LABOR INFORMATION
Operation Number
A40-18506-1

Description
Correct Airline Routing to ATR-6 Valve

Time
0.8 hrs

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with this
campaign must be marked with a CTS-1075
Campaign Identification Label.
Complete the label and attach on a clean surface
next to the vehicle identification number (VIN) plate.

ADMINISTRATIVE / DEALER RESPONSIBILITIES
WARRANTY CLAIMS
Warranty claim expense is to be charged to Warranty. Claims are to be
submitted in the normal manner, making reference to Safety Recall 18506.
Section 7 of the Warranty Policy and Procedures Manual contains further
information related to the submission and processing of AFC / Recall claims.
As with all claim submissions, items acquired locally must be submitted in the
“Other Charges” tab. The cost of any bulk items (such as a bag of cable tie
straps, roll of wire, barrel of oil, or tube of silicone) should be prorated for the
cost of the individual pieces / amount used during each repair.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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UNITED STATES AND POSSESSIONS
The National Traffic and Motor Vehicle Safety Act, as amended, provides that
each vehicle that is subject to a vehicle recall campaign must be adequately
repaired within a reasonable time after the owner has tendered it for repair. A
failure to adequately repair within 60 days after a tender of a vehicle is prima
facie evidence of failure to repair within a reasonable time. If the condition is not
adequately repaired within 60 days, the owner may be entitled to replacement
with an identical or reasonable equivalent vehicle at no charge, or to a refund of
the purchase price less a reasonable allowance for depreciation.
Dealers must correct all vehicles subject to this campaign at no charge to the
owner, regardless of mileage, age of vehicle, or ownership, from this time
forward.
Dealers should proceed immediately to make necessary correction to units in
inventory. All inventory vehicles subject to this recall campaign must be
corrected prior to sale, transfer or delivery. If vehicles have been sold or
transferred and you are in receipt of Customer Notification Letters and
Authorization for Recall Service cards for those vehicles, the transfer location or
customer must be notified immediately from your dealer location.
Dealers must make every effort to promptly schedule an appointment with each
owner to repair his or her vehicle as soon as possible. However, consistent with
the customer notification, dealers are expected to complete the repairs on the
mutually agreed upon service date.
Dealers involved in the recall process will be furnished a listing of owner names
and addresses to enable them to follow up with owners and have the vehicles
corrected. Use of this listing must be limited to this campaign because the list
may contain information obtained from state motor vehicle registration records,
and the use of such motor vehicle registration data for purposes other than this
campaign is a violation of law in several states.
CANADA
Dealers must correct all vehicles subject to this campaign at no charge to the
owner, regardless of mileage, age of vehicle, or ownership, from this time
forward.
Dealers should proceed immediately to make necessary correction to units in
inventory. All inventory vehicles subject to this recall campaign must be
corrected prior to sale, transfer or delivery. If vehicles have been sold or
transferred and you are in receipt of Customer Notification Letters and
Authorization for Recall Service cards for those vehicles, the transfer location or
customer must be notified immediately from your dealer location.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

9

Dealers must make every effort to promptly schedule an appointment with each
owner to repair his or her vehicle as soon as possible. However, consistent with
the customer notification, dealers are expected to complete the repairs on the
mutually agreed upon service date.
Dealers involved in the recall process will be furnished a listing of owner names
and addresses to enable them to follow up with owners and have the vehicles
corrected. Use of this listing must be limited to this campaign because the list
may contain information obtained from state motor vehicle registration records,
and the use of such motor vehicle registration data for purposes other than this
campaign is a violation of law in several states.
EXPORT
Export Distributors should proceed immediately to make necessary correction to
units in inventory. All inventory vehicles subject to this recall campaign must be
corrected prior to sale, transfer or delivery. If vehicles have been sold or
transferred and you are in receipt of Customer Notification Letters and
Authorization for Recall Service cards for those vehicles, the transfer location or
customer must be notified immediately from your distributor location.
Export Distributors are to submit warranty claims in the usual manner making
reference to this recall number.
Export Distributors are expected to provide full cooperation and follow-up with
respect to this important subject matter. If you have any questions or need
further assistance, please contact the Regional Service Manager at your regional
office.

NAVISTAR, INC.

VEHICLE RECALL 18506
© 2018 Navistar, Inc. All rights reserved. All marks are trademarks of their respective owners.

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