IK0400088 ­ Brake Single Hot Wheel End Service Procedure

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Document
IK0400088
ID:

Availability: ISIS, IsSIR

Revision: 13

Major
System:

BRAKES

Created:

9/26/2011

English

Last
Modified:

10/17/2017

Author:

James
Santos

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Title : Brake Single Hot Wheel End Service Procedure
Applies To : ALL Models

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
10/17/2017 - Linked IK0400151
6/29/2017- Removed SRT links
9/7/2014- Added Warranty noun and SRT times
8/24/2014­ Updated with Step Based Process and Updated with Supplier Maintenance Document
8/18/2014 - Updated keywords

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DESCRIPTION
• Single wheel end brake overheat - procedure to resolve issue.

SYMPTOMS
• Single smoking or over heated wheel end predominantly on drive axles.

SPECIAL TOOLS

Tool Description

Comments

Brake Drum Micrometer

Obtain Locally

RESOLUTION
NOTE: Refer to IK0400151 for additional info on LT and RH chassis with 15,000 miles or less.

Step
1

Step
2

Action
Measure BSAP and free stroke to confirm and document over adjusted brakes Adjustment
Worksheet

Decision
Yes: Proceed to step 2

Are the brakes over adjusted?

No: Determine if issue is with
drive train or rolling wheel end
i.e. Bearing, Axle, wheel hub,
wheel seal.

Action
Is there any visible damage to the Brake Drum, Linings or Slack Adjuster?

Decision
Yes: Proceed to step 3
No: Proceed to Step 4

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IK0400088 ­ Brake Single Hot Wheel End Service Procedure

Step
3

Action
Remove components and inspect.
Is there any progressive damage present i.e. cracked or out of round drums, chunked or
cracked linings, torn or physical damage to actuator and boot? Note: minor bluing of the
drum surface is acceptable, if drum is within 0.010 out of round limit.
Note: Linings are reusable if there is no damage present.

Page 2 of 3

Decision
Yes: Replace damaged parts
and Proceed to step 4
No: If there are no damaged
parts Proceed to Step 4

Note: Slack adjuster is reusable if it passes supplier inspection in suppliers maintenance
document and no damage found.

Step
4

Action
Perform Reset Initial brake adjustment in section A of this article

Decision
Yes: Proceed to step 5

Is free stroke within 0.5 and 0.625 inches ?
No: Repeat Step 4

Step
5

Action
Check for proper function of S-Cam and lubrication of Tube in Section B of this article.
Do Brakes release freely ?

Decision
Yes: Release vehicle to
customer
No: Proceed to Step 6

Step
6

Action
Preform repair procedures as stated in Section B of this article and following suppliers
maintenance document.

Decision
Yes: Release vehicle to
customer

Do brakes release freely after repair?

No: Recheck Diagnostic steps
and make certian none were
missed.

Section A
Reset initial brake adjustment with the following procedure.
• With the wheels chocked and park brake released, air up the tractor until the system purges and air system is full
• Measure the distance from the centerline of the clevis pinto the face of the brake chamber can. (Should be 2.25 inches) Record the dimension.
• with a bar pull the chamber pushrod until it stops and measure the distance again from the centerline of the clevis pin to the face of the brake

chamber can. Record the dimension.
• Subtract the first measurement from the second. It should be 0.5 to 0.625 inches.
• If not in that range, remove the clevis pins connecting the slack to the brake chamber clevis and adjust the slack to the brake chamber centerline

per the suppliers maintenance document.After properly adjusting the slack to the brake chamber clevis pin hole centerline, at 2.25 inches,
reinstall the clevis pins and clips.
• After the pins are reinstalled, adjust the brake shoe to drum clearance with the suppliers maintenance document. (Tighten till drum won’t turn,
then back off adjuster a 1/2 turn, check for free rotation).

Section B
Check for proper lubrication of S-Cam tube.

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IK0400088 ­ Brake Single Hot Wheel End Service Procedure

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Page 3 of 3

Have an assistant apply and release the service brake. Check that brake releases completely
Lubricate the S-Cam tube until grease is noted to be flowing out around the entire circumference of the chamber end of the S-Cam tube.
If the brake does not release completely or is "grabby" repair of the S-Cam and bushing is required.
Proper repair would consist of replacement of the S-Cam bushing and buffing any rust off of the S-Cam with emery cloth. The S-Cam is reusable if not badly
pitted.
Reassemble the S-Cam assembly per the suppliers maintenance document.

STANDARD REPAIR TIMES
Description

SRT Link

Brake Adjustment Reset Single Wheel

A04­T1

Front Axle ASA replacement

A04-242

Rear Axle ASA replacement

A04­240

Front Drum replacement outboard mounted single wheel

A04-110

Front Drum replacement outboard mounted both wheels

A04-111

Rear Drum replacement outboard mounted wheels single wheel

A04-120

Rear Drum replacement outboard mounted wheels one axle

A04-121

Rear Drum replacement outboard mounted wheels two axles

A04-122

Shoe replacement front outboard mounted single wheel

A04-152

Shoe replacement front outboard mounted both wheels

A04-157

Shoe replacement rear outboard mounted single wheel

A04-153

Shoe replacement rear outboard mounted one axle

A04-158

Shoe replacement rear outboard mounted two axles

A04-159

WARRANTY INFORMATION
Warranty Claim Coding:
Group: 04091
Noun:

013

OTHER RESOURCES
WWW.MERITOR.COM

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