Fleet Maintenance - 74

GUEST EDITORIAL
» (Left) Fleets have experienced reduced
stopping distances with ADBs, providing
payback in the form of fewer accidents.
Photo courtesy of Petro Canada Lubricants.

» (Below) Meritor offers ADB maintenance
and service information through Meritor
DriveForce, with a team that visits fleets to
perform on-site training and provide technical
support; and through Meritor Parts Xpress,
with links to online training, suggested
stocking lists, and technical literature.
Photo courtesy of Meritor Inc

Differences servicing
ADBs versus drum brakes
The adoption of air disc brakes
will continue due to the time
and labor savings for fleets.
A growing number of fleets are adopting air
disc brakes (ADBs). In fact, some forecasts show
30 percent of the North American market will
be specifying ADBs by 2020, compared to 10
percent in 2010.
Fleets have experienced reduced stopping
distances with ADBs, providing payback in the
form of fewer accidents.
ADBs provide substantial savings in time and
labor when it comes to maintenance and repair.
However, any new technology comes with a
learning curve, and ADBs are no exception.
It is important for technicians to know how
to inspect and maintain ADBs, both to protect
equipment and ensure the fleet experiences the
full benefit of their investment. It is a case where
a little training pays off in a big way.

By Justin McCoy

AFTERMARKET SENIOR PRODUCT MANAGER,
DISC BRAKES, MERITOR
Headquartered in Troy, Michigan, Meritor is a global
supplier of drivetrain, mobility, braking, and aftermarket
solutions for commercial vehicles. McCoy is the Meritor
aftermarket senior product manager for disc brakes. He
has 30 years of experience in the trucking industry. He
started in the heavy duty aftermarket industry working
for a western Canadian warehouse distributor. He holds
an undergraduate degree in Economics and a Master of
Business Administration.

74 Fleet Maintenance | October 2019

Inspection routines
to consider
Fleets can start by implementing an inspection
routine that includes intermittent wheels-on
inspections as well as more comprehensive (but
less frequent) wheels-off inspections to keep
their calipers in working order.
Wheels-on inspection for ADBs
The technician can take a quick look at each
brake for pad wear and rotor condition,
followed by an adjustment test. Further, the
caliper can be inspected for any loose or missing caps, plugs, and mounting bolts.
This type of inspection should be done during
the fleet's or manufacturer's chassis lubrication
schedule or at least four times between pad
changes - whichever is most frequent.
Wheels-off inspection for ADBs
This is a more thorough inspection that
allows the technician to check the slide pin,
tappet boots, and pad abutments. The technician can then check for caliper free play,
which is an indicator of bushing or slide pin
wear. This should be done during a wheel
service or tire replacement.
While this may sound complicated, ADBs
are easier to service than drum brakes
because they are built with fewer components. Reduced labor costs and increased
vehicle uptime represent enormous potential
benefits to fleets.
Manufacturers of ADBs are the best sources of maintenance and service information on
their systems.

Comparing maintenance
by brake type
Drum brake maintenance often involves
inspecting brake linings and lubricating cam
bushing and slack adjusters, while servicing
ADBs often requires only checking for pad wear
as well as making sure the boots and seals are in
good working condition. Consider the following
comparison of changing brake pads on the two
systems.
Installing new pads on a drum brake is a
10-step procedure:
1. Remove wheel
2. De-adjust slack adjuster
3. Remove drum
4. Pull off retainer springs
5. Remove old brake pads
6. Install new brake pad shoes, anchor pins,
and springs
7. Lubricate S-cam and automatic slack
adjuster
8. Measure applied stroke
9. Reinstall drum
10. Reinstall wheel
Total time: 90 minutes
Installing new pads for an ADB system
involves the following:
1. Remove wheel
2. Remove pad retainer strap
3. Remove old brake pads
4. Back off caliper piston
5. Inspect boots, pad abutments, and caliper
free play
6. Install new brake pad
7. Reinstall pad retainer strap
8. Set running clearance
9. Reinstall wheel
Total time: 30 minutes
The time saved is multiplied by the number
of wheels to be serviced, meaning the time
savings can be significant.
As service managers and technicians
become more familiar with ADBs and the best
practices for service and maintenance, fleets
continue to experience the benefits and accelerate adoption.



Fleet Maintenance

Table of Contents for the Digital Edition of Fleet Maintenance

Uptime: Are all systems secure?
Cover Story: Connecting to the future
Vehicles: Engine trends impacting performance and fuel efficiency
In the Bay: Understanding tire pressure monitoring and management systems
Shop Operations: How fleets can benefit from RCM
Management: Are you a good global citizen?
Economic Outlook: WDTKAWDTKI?
Powertrain: What are fault code action plans, and how can they help improve the vehicle diagnostic process?
Braking & Collision Avoidance: How will electric vehicles impact commercial truck braking systems?
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest Editorial: Differences servicing air disc brakes versus drum brakes
Fleet Maintenance - 1
Fleet Maintenance - 2
Fleet Maintenance - 3
Fleet Maintenance - 4
Fleet Maintenance - 5
Fleet Maintenance - 6
Fleet Maintenance - 7
Fleet Maintenance - Uptime: Are all systems secure?
Fleet Maintenance - 9
Fleet Maintenance - Cover Story: Connecting to the future
Fleet Maintenance - 11
Fleet Maintenance - 12
Fleet Maintenance - 13
Fleet Maintenance - 14
Fleet Maintenance - 15
Fleet Maintenance - 16
Fleet Maintenance - 17
Fleet Maintenance - 18
Fleet Maintenance - 19
Fleet Maintenance - Vehicles: Engine trends impacting performance and fuel efficiency
Fleet Maintenance - 21
Fleet Maintenance - 22
Fleet Maintenance - 23
Fleet Maintenance - 24
Fleet Maintenance - 25
Fleet Maintenance - 26
Fleet Maintenance - 27
Fleet Maintenance - 28
Fleet Maintenance - 29
Fleet Maintenance - 30
Fleet Maintenance - 31
Fleet Maintenance - 32
Fleet Maintenance - 33
Fleet Maintenance - In the Bay: Understanding tire pressure monitoring and management systems
Fleet Maintenance - 35
Fleet Maintenance - 36
Fleet Maintenance - 37
Fleet Maintenance - 38
Fleet Maintenance - 39
Fleet Maintenance - 40
Fleet Maintenance - 41
Fleet Maintenance - 42
Fleet Maintenance - 43
Fleet Maintenance - Shop Operations: How fleets can benefit from RCM
Fleet Maintenance - 45
Fleet Maintenance - 46
Fleet Maintenance - 47
Fleet Maintenance - 48
Fleet Maintenance - 49
Fleet Maintenance - Management: Are you a good global citizen?
Fleet Maintenance - Economic Outlook: WDTKAWDTKI?
Fleet Maintenance - Powertrain: What are fault code action plans, and how can they help improve the vehicle diagnostic process?
Fleet Maintenance - 53
Fleet Maintenance - Braking & Collision Avoidance: How will electric vehicles impact commercial truck braking systems?
Fleet Maintenance - 55
Fleet Maintenance - Fleet Parts & Components
Fleet Maintenance - 57
Fleet Maintenance - 58
Fleet Maintenance - 59
Fleet Maintenance - 60
Fleet Maintenance - 61
Fleet Maintenance - Tools & Equipment
Fleet Maintenance - 63
Fleet Maintenance - 64
Fleet Maintenance - 65
Fleet Maintenance - 66
Fleet Maintenance - 67
Fleet Maintenance - 68
Fleet Maintenance - 69
Fleet Maintenance - 70
Fleet Maintenance - 71
Fleet Maintenance - 72
Fleet Maintenance - Classifieds
Fleet Maintenance - Guest Editorial: Differences servicing air disc brakes versus drum brakes
Fleet Maintenance - 75
Fleet Maintenance - 76
Fleet Maintenance - I1
Fleet Maintenance - I2
Fleet Maintenance - S1
Fleet Maintenance - S2
Fleet Maintenance - S3
Fleet Maintenance - S4
Fleet Maintenance - S5
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Fleet Maintenance - S7
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Fleet Maintenance - S16
Fleet Maintenance - S17
Fleet Maintenance - S18
Fleet Maintenance - S19
Fleet Maintenance - S20
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