Matiti Valve in Trucks: What It Means, How It Works, and Price in Kenya

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Why a Truck “Matiti Valve” Releases Air Every Few Seconds (Actros, Volvo, Scania Explained)

Heavy trucks like the Mercedes Actros, Volvo FH, and Scania rely on compressed air systems to operate their brakes safely. One important component in this system is what many mechanics in Kenya call the “Matiti valve.”

If you hear air releasing from this valve every few seconds, many drivers worry something is wrong with the truck. However, in some cases this behavior is normal, while in others it may indicate a problem in the air brake system.

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What Is a Matiti Valve in a Truck?

The part commonly called the Matiti valve is a type of air brake protection or pressure regulating valve found in heavy trucks.

Its main job is to:

• Distribute compressed air to different brake circuits

• Protect the air brake system from pressure overload

• Release excess air when tanks are full

• Maintain safe pressure for braking systems

Because the valve has several round chambers on top, mechanics jokingly call it “matiti” (Swahili slang for breasts).

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Why the Matiti Valve Releases Air

When a truck builds air pressure through the compressor, the system must maintain a safe limit.

If the pressure becomes too high, the valve will release air automatically to prevent damage to the air tanks or brake system.

This process is sometimes called “blowing off air.”

Drivers may hear a short pssst sound from the valve when this happens.

Estimated Matiti Valve Price in Kenya

Truck releasing air? It could be the Matiti Valve.
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When Air Release Is Normal

In many trucks, releasing air occasionally is completely normal.

For example:

• When air tanks are full or almost full

• When the compressor stops pumping

• When the system reaches the cut-out pressure level

This is why some mechanics say:

“Isipo chemua compressor itapiga hewa.”
(When the compressor stops pumping, it releases air.)

 

When It Might Indicate a Problem

However, if the valve releases air every few seconds, it may indicate a fault somewhere in the air system.

Common causes include:

1. Air Leak in the Brake System

A small leak in hoses, valves, or brake chambers can cause pressure to drop repeatedly.

2. Faulty Air Governor

The governor controls when the compressor starts and stops pumping air.

If it fails, the system may cycle too frequently.

3. Worn Out Matiti Valve

If the valve itself is worn, it may release air too often or continuously.

4. Faulty Air Dryer

Moisture or dirt in the air system can cause valves to malfunction.

Trucks That Use This Valve

You will commonly find this valve in:

• Mercedes Benz Actros

• Volvo FH trucks

• Scania trucks

• Isuzu heavy trucks

• Trailer braking systems

These trucks rely heavily on compressed air braking systems, which makes valves like this critical for safety.