DAIMLER

Daimler Trucks North America
Stan Weiss

DSM SE Region

Field Service

11/19/2018

Subject: Brakes very noisy when stopping ABS light coming on

cee

Our records indicate that you are the owner of certain vehicles, which experience brake noise and shake
when coming to a stop, and also have an ABS light coming on. DTNA has decided to proactively perform
SB-42-077 service bulletin for this issue to resolve this issue for units built prior to 7/17/2018.

This documentation applies to Freightliner, New Cascadia, 2017, and early production 2018 vehicles.

We hope you find this information addressing this complaint beneficial in resolving this matter.

Sent Via “email”

Trucks built prior to 7/16/2018 will be repaired to improve brake performance. SB 42-077 applies to the
repairs involved in resolving this issue; there are 16 units out of the 44 in your fleet that will require
having the service bulletin performed per the effected list attached to this communication.

Applicable vehicle’s should be coordinated to have SB 42-077 performed at authorized Freightliner dealer
location.

For Claim approval, please contact
Stan Weiss- District Service Manager Daimler Trucks of North Americe ia

Claim guidelines are out lined in the service bulletin and will be sent to Stan Weiss code SE for policy
approval.

Daimler Trucks North America, LLC
4747 N. Channel Avenue
Portland OR 97217-7699

Steer Axle Brake Chatter 42-077

FLA COE Century Class Conventional Business Class M2 i i

FLB COE Argosy COE Cascadia Freightliner
FLD Conventional Cargo 108SD/114SD Service Bulletin
Business Class Columbia > New Cascadia

FLC 112 Conventional 1228D and Coronado

General Information

Some New Cascadia vehicles equipped with a Meritor stamped spider steer axle drum brake package have
experienced brake chatter (noise) when the service brakes are applied at lower speeds. Examples of brake
chatter can be heard in the following videos:

ABS Brake Noise https://dtnacontent-dtna.prd.freightliner.com/content/dam/techlit/video/
ABS_Brake%20Noise.mp4

This issue can be resolved by replacing the stamped spider plates with cast plates (part number TDA KIT8341)
using the instructions below.

General Safety Precautions
A WARNING

When replacing brake pads, shoes, rotors, or drums, always replace components as an axle set.
¢ Always reline both sets of brakes on an axle at the same time.
¢ Always replace both rotors/drums on an axle at the same time.

« Always install the same type of linings/pads or drums/rotors on both axle ends of a single axle at
the same time. Do not mix component types.

Failure to do so could cause uneven braking and loss of vehicle control, resulting in property damage,
personal injury, or death.

When working on or around a vehicle, observe the following precautions:

Park the vehicle on a level surface and apply the parking brakes. Shut down the engine and chock the
tires.

If the vehicle is equipped with air brakes, make certain to drain the air pressure from all reservoirs before
beginning any work on the vehicle. Depleting air system pressure may cause the vehicle to roll. Keep
hands away from brake chamber pushrods and slack adjusters, which may apply as air pressure drops.

Disconnect the batteries.

Never connect or disconnect a hose or line containing compressed air. It may whip as air escapes. Never
remove a component or pipe plug unless you are certain all system pressure has been released.

Never exceed recommended air pressure. Always wear safety glasses when working with compressed air.
Never look into air jets or direct them at anyone.

Do not remove, disassemble, assemble, or install a component until you have read and understand the
service procedures. Some components contain powerful springs, and injury can result if not properly
disassembled. Use the correct tools and observe all precautions pertaining to use of those tools.

Replacement hardware, tubing, hose, fittings, etc. should be the equivalent size, type, length, and
strength of the original equipment.

Make sure when replacing tubes or hoses that all of the original supports, clamps, or suspending devices
are installed or replaced.

Replace devices that have stripped threads or damaged parts. Repairs requiring machining should not be
attempted.

Freightliner Service Bulletin, 10/30/2018 Page 1

42-077 Steer Axle Brake Chatter

ightli FLA COE Century Class Conventional Business Class M2
Freightliner . FLB COE Argosy COE Cascadia
Service Bulletin FLD Conventional Cargo 108SD/114SD
Business Class Columbia > New Cascadia
FLC 112 Conventional 122SD and Coronado

* Prior to returning the vehicle to service, make certain all components and systems are restored to their
Proper operating condition.

Disassembly and Inspection
A WARNING

Before working on or around air brake systems and components, review the General Safety
Precautions. Failure to do so may result in personal injury.

When performing these instructions, refer to Fig. 1.

1102/2016 421684
4. Anchor Pin 9. Capscrew, Dust Shield 17. Camshaft-and-Chamber Bracket

2. Anchor Pin Bushing 10. Dust Shield 18. Grease Fitting

3. Retaining Spring 11. Camshaft Snap Ring 19. Chamber Bracket Seal

4. Brake Shoe and Lining Assembly 12. Washer (spacer) 20. Return Spring

5. Cam Roller 13. Automatic Slack Adjuster 21. Return Spring Pin

6. Roller Retainer 14. Washer (thick spacer) 22. Brake Spider

7. Capscrew, Chamber Bracket 15. Camshaft Grease Seal 23. Camhead Thrustwasher

8. Plug 16. Camshaft Bushing 24. S-Head Camshaft

Fig. 1, Q Plus Brake (other than MX500 Series)

1. Park the vehicle on a level surface, shut down the engine, and set the parking brake. Chock the tires on the
rear axle.

2. Raise the front axle and place safety stands under the frame or axle. Be sure the stands will support the
weight of the vehicle.

Page 2 Freightliner Service Bulletin, 10/30/2018

Steer Axle Brake Chatter

42-077

FLA COE

FLB COE

FLD Conventional
Business Class

FLC 112 Conventional

Century Class Conventional Business Class M2

Freightliner

Argosy COE Cascadia a
Cargo 108SD/114SD Service Bulletin
Columbia > New Cascadia

1228D and Coronado

3. Remove the front wheels. For instructions, see Section 40.00, Subject 100 in the New Cascadia Workshop

Manual.

4. Remove the front hubs. For instructions, see Section 33.01 in the New Cascadia Workshop Manual.
5. Remove the brake drums. For instructions, see Section 33.01 in the New Cascadia Workshop Manual.

IMPORTANT. Meritor recommends that the brake drum not be turned or rebored (resurfaced). Turning
or reboring drums can decrease the strength and heat capacity of the drum.

6. Inspect the brake drum, as follows. See Fig. 2.

11/10/2016 £420690a

A. Check for diameter and out-of-round.
B. Check for cracks, heat checks, glazing, and
grooves.

Fig. 2, Brake Drum Inspection

6.1 Check the drum for cracks. Replace any cracked drum.

6.2 Check the drum for severe heat-checking, heat-spotting, scoring, pitting, distortion, and out-of-round.
Some drums that are glazed, grooved, or out-of-round can be repaired. For detailed instructions, see
Section 33.01 in the New Cascadia Workshop Manual.

6.3 Using a drum caliper or other measuring device, measure the inside diameter of the drum in several
locations. Replace the drum if it exceeds the maximum diameter stamped on it.

7. Disconnect the slack adjuster from the pushrod clevis, as follows. For detailed instructions, see Section
42.11 for Haldex, or Section 42.12 for Meritor automatic slack adjusters in the New Cascadia Workshop

Manual.

7A Remove the cotter pin from the clevis pin; remove the clevis pin. See Fig. 3.

NOTICE

For a Meritor automatic slack adjuster, disengage the pull-pawl before turning the manual adjusting nut.
Failure to do so could damage the pull-pawl teeth. The brake clearance will not automatically adjust if

the pull-pawl is damaged.

Freightliner Service Bulletin, 10/30/2018, Page 3

42-077

Steer Axle Brake Chatter

Freightliner
Service Bulletin

FLA COE Century Class Conventional
FLB COE Argosy COE

FLD Conventional Cargo

Business Class Columbia

FLC 112 Conventional 1228D and Coronado

11/10/2016 £42047 1b
1. Clevis Pin 4. Control Arm
2. Clevis 5. Adjusting Hexnut

3. Anchor Bracket

Fig. 3, Disconnecting Slack Adjuster from Clevis

Business Class M2
Cascadia
108SD/114SD

> New Cascadia

7.2 For a Meritor automatic slack adjuster, disengage the pull-pawl on the side of the adjuster. Using a
screwdriver or an equivalent tool, pry the pawl button out about 1/32 inch (0.8 mm) and wedge the
tool in place. See Fig. 4. Pull-pawls are spring-loaded. When the tool is removed, the pull-pawl will
engage the teeth automatically.

11/10/2016 1422461

A. Insert a screwdriver here to pry the pull-pawl! out
about 1/32 inch (0.8 mm).

Fig. 4, Meritor ASA Pull-Pawl Disengagement

Page 4

Freightliner Service Bulletin, 10/30/2018

Steer Axle Brake Chatter 42-077

FLA COE Century Class Conventional Business Class M2 ightli

FLB COE Argosy COE Cascadia Freightliner
FLD Conventional Cargo 408SD/114SD Service Bulletin
Business Class Columbia > New Cascadia