Metelli Group brake master cylinders are produced with the same technologies from first implant. As the main brake system suppliers, all Metelli Group brake master cylinder components are checked during the production phase to ensure compliance with highest standard. Low pressure pneumatic seal tests are carried out on the 100% of products assembled using high certified equipment precision ensuring product reliability.


The range of Metelli brake master cylinders available in the catalogue includes about 700 references (mainly for left-habd drive vehicles) and covers over 70% of European Car Parc; it is cinstantly increasing with new models launched on the market.

Recently, a new type of compact brake master cylinders has been introduced, called helical brake master cylinders. To date, there are about 80 references available with this technologies for the main car manufacturesrs, enabling us to offer to the market the latest OE spare parts. Where required in the car, our brake master cylinders meet the functional requirements for braking systems equipped with ABS, ESP and ASR. The performance has been approved on a new test bench which enables the simulation of the brake master cylinder activation in ABS and ESP mode, as well as allowing specific tests to be performed on the internal valves.

Our range includes also brake wheel cylinders and brake master cylinders for Iveco Truck industrial vehicles up until the 1990s, when the braking system on trucks was hydraulic.


The material selected and used for the bodies comply with the OEM standard, which are moving towards the use of aluminium for the reduction of weight and, as a consequence, of consumption. To date, the range is divided as follows:

· Cast iron

· Aluminium

These materials guarantee resistence to corrosion both from external agents and from brake fluid. The surface protection does not contain hexavalent chromium, so it complies with the European directive regarding vehicle scrapping standards.

Metelli is certified according to the ISO 14000 environmental standard.


The inner component materials, such as those use for the pistons, comply with the OEM standard and are in anodised aluminium or stainless steel.

Metelli decided to use anodised aluminium pistons to ensure greater resistence to corrosion and to wear and tear caused by sliding.


The rubber gaskets used on Metelli brake master cylinders comply with the OE specifications, guaranteeing:

· High resistance to wear and tear;

· High resistance to brake liquid;

High resistance to traction and breaking;

Low deformation due to compression

Our products are compatible with brake liquids (DOT 3, DOT 4, DOT 5.1, SAE J1703)


Our brake master cylinders come with mounting accessories (nuts, screws, gaskets, pins...) to speed up installation on the car by the end user. Furthermore, the maximum quality and efficiency of the productis guaranteed; it is supplied with thread cover caps and protective covers, in order to prevent contamination from external agents as well as any damage from accidental impacts.


Helical brake master cylinders, know with technical name as plunger brake master cylinders, are the latest generation in brake master cylinders, characterised by the presence of gaskets that are fixed to the masters cylinders body instead of the moving piston. The master cylinder body features helical grooves that facilitate the movement of the brake fluid and air when bleeding.

The main advabntages of a plunger brake master cylinder over a traditional tandem master cylinder are as follows:

· Compact design, making them ideal for smaller spaces;

· Weight reduction of up to 20%;

· Fewer components;

· The presence of smaller gaskets reduces to the minimum the elastic deformation;

· The use of ring gaskets inside the body ensures greater resistence to dirt and wear. thus extending the life of the component.


To guarantee the quality of the product, type-approval tests are carried out in a dedicated test room. These tests are performed according to strict internal procedures, including:

· Endurance and hydraulic pressure test (300,000 cycles run at different temperatures: -20° ambient t./+80°)

· Endurance testing with drives in ABS and ESP operating mode;

· Pneumatic seal test with low pressure;

· Hydraulic tightness test with low pressure (200bar);

· Bursting test (353 bar)