Range of products comprising: brake pads, brake discs, wheel-cylinders,
master cylinders, pressure regulators, pre-mounted brake shoe kits
with self-adjustment, brake drums, clutch master and slave cylinders.
Hi-tech, fully automated processing, assembly and control machinery
permit utmost product dimensional precision, with consequent maximum
reliability and safety thanks to 100% functional testing of finished
All the products comply with standards set for safety parts by major
A significant part of production, in fact, is dedicated
to OEM and the supply of major European braking system manufacturers.
A brake pad is always composed of two main elements: the back plate and the friction material itself.
The steel back plate, is the support layer for the friction material, transferring more uniformly the pressure coming from the brake caliper piston toward the friction material.
Between the back plate and the friction material, because of very different characteristics of these two elements, there may be interposed a under layer that have the dual function of being a first thermal shield and providing a good adhesive surface for bonding.
The function of the brake disc is to slow and stop a moving vehicle.
Brake discs have gradually replaced brake drums everywhere in the
All cars now have brake discs on the front axle and an increasing
number of cars also have brake discs on the rear axle.
belong to two categories:
- full discs
- self-ventilating discs (provided
with radial perforations) so that when they spin, they are cooled
by the principle of centrifuge pump action: they draw in cool air
from the center and disperse it through the holes around the circumference,
eliminating heat and reducing the danger of a progressive loss of
The essential requisites of the discs are:
- sturdiness, to withstand
the mechanical stresses to which they are subjected;
- they must resist distortion, to enable the calipers to grip a surface
that is always flat and does not cause any vibration;
to abrasion, for long-lasting properties and uniform friction in time;
- they must be good conductors of heat so as to cool rapidly;
must be lightweight, to keep the masses connected to the wheel (called
unsuspended masses) to a minimum and thereby facilitate continuous
contact with the ground even on rough terrain.
Metelli brake discs
are made using raw materials of the highest quality and with the chemical
compositions best suited to application on the vehicle on which they
The mechanical processing is done with the finest machinery
and special equipment designed to eliminate any possibility of geometrical
Scrupulous controls of roughness, parallelism, oscillation,
centering, balancing and bench tests of Metelli discs make them a
guaranteed product for maximum safety, comfort and reliability in
As well as brake pads are working against the brake surface of the disc, brake shoes are working on the inside of the drum brake’s diameter.
Is realized at once how the pressure that is applied is generally lower than the pressure undergoes in a brake pad, on the other hand the surface of contact with the cast iron is much higher.
The effectiveness of a solution adopting the brake drum is not less than the disk one, which remains superior in its ability to withstand the high temperatures and better dissipate the heat generated during braking.
The design features are quite similar, even in the brake shoes there is a metallic substrate that supports the friction material itself.
Pre-mounted Brake Shoes Kit
Normally jobs done on brake blocks only involve replacing shoes and
cylinders and re-utilising pins, washers, adjusters and springs.
old parts are used, the risk exists of negatively affecting the reliability
of the braking system with imbalances caused by lower elastic force
which reduces braking stability and safety.
Not only - the brake drums
could wear quicker and become noisy.
The Metelli rapid kit features
shoes with pre-fitted brake play recovery device, brake cylinders
and a series of accessories, thereby making it possible to replace
all those parts subject to wear and offers:
1) Easy and quick assembly of brakes and shoes on plate;
precision and reliable repair;
3) Big time-saving.
Rotating cylindrical part connected to the wheel; on its inner surface
operate friction seals fixed on brake shoes.
Is an effective kind
of brake, as it requires a limited strain on pedal in order to give
a considerable braking power (unlike discs, servo-brake is not needed).
It is also of cheap realization.
In comparison to disc it overheats
more rapidly, loosing efficacy and also weights more.
is still used on rear axle of small and medium size cars.
The drum brake consists of the following parts: positioned inside
the drum are two shoes covered with friction material, a cylinder
and a number of springs that allow the shoes to move. The most recent
models feature a play recovery device.
The shoes are generally secured
at one end, while at the other end they are in contact with the cylinder
pistons. Brake cylinder tightness is provided by the seal while the
spring ensures integral connection between the pistons and the shoes,
preventing any brake pedal idle strokes in case of the pistons detaching
from the shoes.
The job of the boots is to prevent external agents
(dirt or impurities) penetrating inside the brake cylinder and causing
malfunctions or breakage.
The brake cylinder features a screw for
releasing any air bubbles generated when the braking system is loaded
with special fluid or the shoes are replaced.
Upstream of the braking
system is the master cylinder (brake pump) linked to the cylinder
by means of specific pipes resistant to high pressures through which
flows a special fluid (brake fluid). Braking action occurs by means
of pressure on the master cylinder that conveys the fluid inside the
cylinder, causing the expansion of the pistons.
This in turn forces
the shoes to produce friction on the drum.
Brake Master Cylinders
Transforms the force placed on the brake pedal into a liquid pressure,
which is transmitted via piping and wheel cylinders or calipers to
the shoes or brake pads.
Since about thirty years, all brake master
cylinders have been split in two separate control circuits.
made up of a cylindrical body inside which run two pistons fitted
with sealing rings; one of the two is controlled by a push rod connected
to the servo brake membrane, the other is moved by the pressure of
the liquid located between the two pistons.
The system piping is linked
to the system by means of threaded fittings.
Pressure Regulating Valves
During braking, load is transferred to the front of the vehicle,
with consequent lightening of the rear and loss of grip. In order
to control this load transfer, the front brakes will have to brake
more than the rear brakes.
To achieve this, a device exists called
pressure regulating valve, that adapts the braking capacity of the
rear wheels according to changes in load condition, as well as to
the pressure placed on the brake pedal by the driver.
Clutch Master Cylinders