Brake parts

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 pieces.

All the products comply with standards set for safety parts by major vehicle companies.

A significant part of production, in fact, is dedicated to OEM and the supply of major European braking system manufacturers.

 

Brake Pads

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.

 

 


Brake Discs

The function of the brake disc is to slow and stop a moving vehicle. Brake discs have gradually replaced brake drums everywhere in the world.
All cars now have brake discs on the front axle and an increasing number of cars also have brake discs on the rear axle.
Brake discs 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 braking power.
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;
- resistance to abrasion, for long-lasting properties and uniform friction in time;
- they must be good conductors of heat so as to cool rapidly;
- they 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 are installed.
The mechanical processing is done with the finest machinery and special equipment designed to eliminate any possibility of geometrical error.
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 time.

 

Brake Shoes

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.
If 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;
2) Utmost precision and reliable repair;
3) Big time-saving.

 

Brake Drums

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.
Nowadays it is still used on rear axle of small and medium size cars.

 

Wheel Cylinders

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.
It is 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 Slave Cylinders

The clutch slave cylinder is a component that works together with the clutch master cylinder. Under the effect of the hydraulic pressure generated by the clutch master cylinder, it is able to move the clutch disk of the engine flywheel to allow the gear change.
Our range of clutch slave cylinders is produced in different materials including cast iron, aluminum and plastic.

 

Clutch Master Cylinders

The clutch master cylinder converts the force generated by the pressure of the clutch pedal in hydraulic pressure. The hydraulic pressure developed is converted into movement of the clutch disc. Our range of clutch master cylinders includes the use of different types of materials among which we include cast iron, aluminum and plastic.

 
Metelli S.p.A. - Via Bonotto, 3/5 - 25033 Cologne (BS) - Italy - Tel. +39 030 705711 - Fax +39 030 7057376 Reg. Imp. BS - C.F. P. IVA IT01517740989 - R.E.A. 316597 - Cap. Soc. € 15.000.000 i.v.