Fleet Maintenance - 20

BEST PRACTICES FOR MAINTAINING
Attentive
monitoring and
maintenance practices
assure operational
efficiency and prolong
the life of the hydraulic
braking system.
By Tyler Fussner

[ BRAKING SYSTEMS ]

F

leets operating Class 1 through 5,
or select Class 6 vehicles, utilize hydraulic braking systems. As with all vehicle systems,
proper maintenance is crucial in ensuring vehicle uptime and
safety. A well-maintained braking system is paramount in establishing an
environment for both fleet vehicles and public motorists to safely maneuver the roadways. Understanding the basic mechanics of the hydraulic braking system unveils the critical
components that fleet technicians need to monitor and service in order to keep the vehicle in
optimal working condition.

Hydraulic brake basics

The hydraulic braking system operates on a fairly simple concept of force. A driver applies force to
the brake pedal, and that force is transferred to the wheel-ends where the brake friction material
contacts the rotor or drum, reducing the kinetic energy and, in turn, reducing the vehicle's speed.
"A hydraulic brake system uses a thick, [virtually] incompressible fluid to transmit the driver's
pedal force to the wheel-ends," says Tom Jendrusch, product design engineer, AERO Light Repair
Engineering, of American multinational automaker Ford Motor Company. "The pedal force is converted to a hydraulic pressure in the master cylinder. With a disc brake, this pressure acts as a force
against the caliper piston, pressing the piston out so that the brake pads attached to the caliper press
against the rotating rotor and generate friction, or heat. With a drum brake, the pressure forces the
brake shoes against the drum to create the friction. The rotor, or drum, which has the wheel and
tire attached, slows down causing the vehicle to slow down."

20 Fleet Maintenance | October 2020

"Cost, packaging,
and ease of
operation are
the most obvious
benefits [of
hydraulic brakes]."
Tom Jendrusch, product design
engineer, AERO Light Repair
Engineering, Ford Motor Company



Fleet Maintenance

Table of Contents for the Digital Edition of Fleet Maintenance

Uptime: How Fleets Can Connect with Tech Schools
Editor's Note: The Aftertreatment Blues
Keys to Maximizing Trailer ROI
Best Practices for Maintaining Hydraulic Braking Systems
Solving the Parts Puzzle
Contending with Accelerated BEV Tire Wear
Cold Weather HVAC Considerations
Management: CMMS Marketplace
Economic Outlook: Signs of Economic Recovery
Diagnostics: Choosing the Right Diagnostic Tool for Roadside Triage
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest Editorial: The Propane-Powered Alternative
Fleet Maintenance - 1
Fleet Maintenance - 2
Fleet Maintenance - 3
Fleet Maintenance - 4
Fleet Maintenance - 5
Fleet Maintenance - 6
Fleet Maintenance - 7
Fleet Maintenance - Uptime: How Fleets Can Connect with Tech Schools
Fleet Maintenance - 9
Fleet Maintenance - Editor's Note: The Aftertreatment Blues
Fleet Maintenance - 11
Fleet Maintenance - Keys to Maximizing Trailer ROI
Fleet Maintenance - 13
Fleet Maintenance - 14
Fleet Maintenance - 15
Fleet Maintenance - 16
Fleet Maintenance - 17
Fleet Maintenance - 18
Fleet Maintenance - 19
Fleet Maintenance - Best Practices for Maintaining Hydraulic Braking Systems
Fleet Maintenance - 21
Fleet Maintenance - 22
Fleet Maintenance - 23
Fleet Maintenance - 24
Fleet Maintenance - 25
Fleet Maintenance - Solving the Parts Puzzle
Fleet Maintenance - 27
Fleet Maintenance - 28
Fleet Maintenance - 29
Fleet Maintenance - 30
Fleet Maintenance - 31
Fleet Maintenance - Contending with Accelerated BEV Tire Wear
Fleet Maintenance - 33
Fleet Maintenance - Cold Weather HVAC Considerations
Fleet Maintenance - 35
Fleet Maintenance - Management: CMMS Marketplace
Fleet Maintenance - 37
Fleet Maintenance - 38
Fleet Maintenance - 39
Fleet Maintenance - Economic Outlook: Signs of Economic Recovery
Fleet Maintenance - 41
Fleet Maintenance - Diagnostics: Choosing the Right Diagnostic Tool for Roadside Triage
Fleet Maintenance - 43
Fleet Maintenance - 44
Fleet Maintenance - 45
Fleet Maintenance - Fleet Parts & Components
Fleet Maintenance - 47
Fleet Maintenance - 48
Fleet Maintenance - 49
Fleet Maintenance - 50
Fleet Maintenance - Tools & Equipment
Fleet Maintenance - Classifieds
Fleet Maintenance - 53
Fleet Maintenance - Guest Editorial: The Propane-Powered Alternative
Fleet Maintenance - 55
Fleet Maintenance - 56
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