Friction Materials Types and Terms
Types of Friction Materials
- used
to be the most common type of friction materials, but due to connections
to lung disease,
they are being phased out of the market.
- use friction material to slow vehicles by pressing against the brake disc.
- is the heat-resistant material that creates friction in braking devices.
- are
very popular because they eliminate squeal and audible vibrations.
They are also less abrasive to rotors
and their brake pads tend to have a longer life-span than those of
other materials.
- are
used to maintain lower coefficients of friction, which provide smooth
and stable clutch engagement/disengagement.
They help reduce clutch chatter, are available in molded and woven
compositions
and can be found with asbestos or asbestos-free materials.
- squeeze the rotor to slow the disc.
- are resilient and adaptable, and help maximize
the consumption of power and energy. They were created especially
for high speed and energy applications.
- are new to the market, and are currently being
tested for durability, preservation of rotors and drums and
noise level.
- metal plates bonded with friction materials that are used to brake.
- are
used in applications that have a higher temperature because of their
good energy absorption. These kinds of materials help hold in heat
for a long period of time.
- includes all friction materials made without
asbestos, due to concern over the affect of asbestos on
health. These tend to
be more abrasive and accelerate rotor wear.
- have some of the best performance of the friction
materials. They are made of fibers and fillers and, after
the addition of water,
are dried and compressed into a sheet.
- are high performance and designed
to prevent fade and squeal. They handle heat better
than many others.
- are compacted friction modifiers and metallic
powders, and work best with very little oil flow.
They have the ability to operate in very high temperatures.
Friction Material Terms
- Refers to the stability between the
front and rear brakes.
- The process by which overheated or spoiled brake fluid
and air bubbles are removed from the brake system.
- Metal housing bolted to an axle and vehicle wheel
that looks like a large jar lid. Brake shoes are forced against the drum
to stop rotating wheels.
- Heat-resistant
friction material that presses against the disc/drum to create braking
force.
- Made of friction materials and bonded to metal plates.
Brake pads need to be replaced occasionally due to heavy wear.
- Process of wearing in brakes so that the contact between
the friction material and the rotor or drum becomes stable.
- The assembly that
houses the brake pad(s) and applies them to the rotor. This also houses
the hydraulically operated pistons
to which the pads are bonded.
- Any of various contraptions used to engage and disengage
two moving parts of a shaft or shaft and driving mechanism. When changing
gears, the clutch pedal is pressed, disengaging the clutch and allowing
the gear change; when released, the clutch engages and transfers the
rotating motion throughout the entire driveshaft.
- The ratio of force necessary to move
an object compared to the weight of the object itself.
- Consists of brake pads, caliper and rotor. This is
the part of the brake system that actually stops the vehicle.
- A large circular metal
housing that looks like an oversized jar lid and is bolted to a vehicle's
axle and wheel. Brake shoes are forced against the inner section of the
drum, which then stops the
rotating wheel.
- Apparatus in a laboratory used to test brake system
performance.
- Temporary reduced braking power. Fade results from overheating
of the friction material.
- Grooves on friction material that help dispel
heat, get rid of fluid and eliminate noise.
- The cylinder that contains hydraulic fluid and
a piston. It is connected directly to the brake pedal and transmits pressure
to the brake operating system.
- The return of braking performance to a normal level
after fade has diminished. This measures friction materials' ability
to perform after overheating.
- Also referred to as a disc or drum, this is the circular
metal object to which the brake pads are applied, creating friction to
slow and stop the vehicle.
- A steel semicircular form coated with a friction agent that
presses against the inside of a drum when activated.
- High-pitched noise made when braking. Squeal indicates
that brakes should be inspected for wear.