IK0400019 Service Bulletin/Repair Instructions

IK0400019 - Air Powered (SAAR) Park Brake Troubleshooting (Service "P" Light Comi... Page 1 of 4
Countries:
CANADA, UNITED

STATES
Document ID: IK0400019
Availability:
ISIS, FleetISIS
Revision:
1
Major System:
BRAKES
Created:
4/9/2007
English
Last

Modified:
11/2/2012
Author:
Rob

Marvel
Current

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Other Languages: NONE

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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)
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
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IK0400019 - Air Powered (SAAR) Park Brake Troubleshooting (Service "P" Light Comi... Page 2 of 4
TROUBLESHOOTING

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 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
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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IK0400019 - Air Powered (SAAR) Park Brake Troubleshooting (Service "P" Light Comi... Page 3 of 4
COMPONENT LOCATIONS
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IK0400019 - Air Powered (SAAR) Park Brake Troubleshooting (Service "P" Light Comi... Page 4 of 4
Air Park Brake Switch Location (Steering Column Support View)

(1813) PARK INDICATION PRESSURE SWITCH

(1800) DRIVER CONTROL MODULE (DCM) CONNECTOR
For more component locations, click here.

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Copyright © 2012 Navistar, Inc.
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12/3/2012

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