IK0400019 Service Bulletin/Repair Instructions

IK0400019 - Air Powered (SAAR) Park Brake Troubleshooting (Service "P" Light Comi...
Countries:
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BAHAMAS, BOLIVIA, BELIZE, CANADA, CHILE,

TAIWAN, COLOMBIA, COSTA RICA,

DOMINICAN REPUBLIC, ECUADOR, EL

SALVADOR, TRINIDAD AND TOBAGO, UNITED Document

STATES, URUGUAY, VENEZUELA, ARUBA,

IK0400019

ID:

NICARAGUA, PERU, PUERTO RICO, Curaçao,

GUAM, GUATEMALA, GUYANA, HAITI,

HONDURAS, JAMAICA, KOREA, SOUTH

KOREA, PANAMA
Availability: ISIS, FleetISIS, IsSIR
Revision: 6
Major

System:
BRAKES
Created:
English
Last

9/3/2019

Modified:
Current

Language:
Other

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Author:
4/9/2007
David

Horner
15280

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Title : Air Powered (SAAR) Park Brake Troubleshooting (Service "P" Light Coming on)

Applies To : All HPV with Air Powered Park Brake (SAAR)
CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

09/03/2019 - Added MV circuit diagrams, added installation images, update author for feedback purposes

04/04/2018 - Author updated for feedback purposes

04/16/2015 - Added BC session



DESCRIPTION

The SAAR parking brake is an air powered parking brake for hydraulic brake vehicles. Unlike the hydraulic powered parking brake (SAHR) used on

school buses, the air SAAR parking brake is controlled by the ESC.
SIGNALS TO WATCH

BCM session
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ESC session
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TROUBLESHOOTING

NOTE:

On the Pre-2007 trucks with ESC's, the Service P light would go out whenever the DTC went inactive. On the Post-2007 trucks with Body

Controllers(BC), the Service P light will stay on even after the code goes inactive. So in order to get the light to go out, you need to clear

all inactive codes.
1: Is this a problem with the auto-apply only? The auto-apply potion of this parking brake is hard wired and has nothing

to do with the ESC or BC. There is a switch in the shifter that grounds a solenoid which dumps the air out of the SAAR

can, allowing the spring to apply the park brake. See the circuit diagrams below.

2: Does the parking brake actually work? Does it apply and release with the switch? If the parking brake is actually

working with the switch, that tells you that the mechanical and air part of the system is working properly.

a: Measure the SAAR rod travel is it should be about ~1.65 inches (~42mm). If it is above this there is an

adjustment issue. If it is correct and you have an electrical problem.

3: Monitor the Park_Brake_SAAR_Travel_Signal and Park_Brake_Switch_Signal in DLB. If the Service P light is

coming on, it's because these 2 signals do not agree. You need to figure out which one is wrong and then troubleshoot

that circuit.
CIRCUIT DIAGRAMS

•

•

•

•

•

•
For Travel Switch wiring on pre-2007 click here

For Travel Swith wiring on post-2007 click here

For electrical circuit diagrams on pre-2007 click here

For electrical circuit diagrams on post-2007 click here

For electrical circuit diagrams on MV click here

For all other diagrams refer to MSI Home Page
The diagram pictured here, only shows the Auto-apply portion of the park brake wiring. Not all trucks with air powered park brakes have this

feature.
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Figure 1: Auto-Apply SAAR Circuit
COMPONENT LOCATIONS
Figure 2: Air Park Brake Switch Location (Steering Column Support View)

• (1813) Park indication pressure switch
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• (1800) Driver control module (DCM) connector
Figure 3: SAAR Cable installation

• Note: The orientation of the bracket in circle "F" is critical
Figure 4: SAAR Cannister
For more component locations, click here.
WARRANTY INFORMATION

Warranty Claim Coding:

Refer to the Warranty Coding Manual for Group and Noun Codes.

Standard Repair Time(s):
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Refer to the SRT Manual for Repair Times
OTHER RESOURCES

Master Service Information Site
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Copyright © 2019 Navistar, Inc.
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