Rely on tested quality and order your exhaust gas flap directly online.

Safety and performance in the exhaust system

A reliable exhaust flap is crucial for the thermal management and braking performance of modern commercial vehicle engines. Whether as a classic engine brake flap to support deceleration or as part of complex exhaust gas aftertreatment – the exhaust flap must remain absolutely smooth-running even at extreme exhaust gas temperatures. At FZB Fahrzeugbedarf, you will find exhaust flaps in OEM quality that have been specially developed for the tough conditions in long-distance traffic and on construction sites. Our components guarantee precise control of the exhaust gas flow, reduce wear on the service brake and contribute to compliance with applicable emission guidelines.

Reliable spare parts

Our range includes pneumatically and electrically controlled models that impress with their high temperature resistance, precise workmanship and long service life. This ensures that your truck works reliably and downtimes are minimized. An important aspect of replacement is the accuracy of fit. That’s why we offer exhaust flaps with exact specifications, tailored to different truck brands and vehicle types. This means you can quickly find the right spare part and carry out your repair or maintenance efficiently and reliably.

Exhaust gas flap

ACCURACY OF FIT

The so-called OE number (original equipment) and dimensions (diameter, installation type) are decisive.

MATERIAL AND CONTROL

Pneumatic, electrical or mechanical – depending on how the truck exhaust system is designed and what load or stress is expected.

LOADABILITY

The temperature and pressure conditions in the flue gas system should match the specifications of the damper.

The exhaust flap as a safety-relevant engine brake
In heavy trucks, the exhaust flap often acts as a dynamic pressure brake. By selectively closing the exhaust tract, a counter-pressure is built up which slows down the piston movement and thus decelerates the vehicle without using the wheel brakes. This protects the brake disks and pads massively. A high-quality exhaust flap is characterized by a heat-resistant bearing and a precise mechanism that does not tend to seize even under continuous load.

Exhaust flap defective? Signs and replacement instructions
A defect in the exhaust flap is often noticeable through a loss of power, increased fuel consumption or warning lights in the cockpit. Common causes are coking due to soot particles or corroded return springs. As the exhaust flap communicates directly with the engine electronics, even the smallest deviations in the flap position lead to emergency running programs. With spare parts from FZB, you can rely on custom-fit solutions that enable quick repairs and restore the full functionality of your exhaust system.

Expert FAQ: Things to know about truck exhaust flaps & engine brakes

It regulates the exhaust gas flow, supports vehicle deceleration as an engine brake and helps with the thermal management of exhaust gas aftertreatment (e.g. regeneration of the particulate filter).

Typical signs are a reduced engine braking effect, rattling noises from the exhaust tract, error messages in the on-board computer or a noticeable loss of power.

The main causes are extreme heat cycles and soot deposits, which make the damper shaft stiff or block the adjustment mechanism.

Pneumatic flaps are controlled by compressed air cylinders, while electric versions use actuators that provide more precise feedback to the control unit.

In some cases, special cleaners dissolve soot deposits. However, if the shaft bearing is worn out or thermally deformed, the flap must be replaced.

It is essential for reaching the operating temperature in the catalytic converter and particulate filter. A malfunction can worsen the emission values and jeopardize the approval.

This depends on the damage pattern. Often only the mechanical flap unit is defective, but the actuating cylinder or electric motor should always be checked for full function.

Due to the extreme heat and chemical stress, only high-quality alloys in original equipment quality can withstand this over the long term without warping.

Your truck exhaust flap makes the difference!

Optimum control, extended brake life and reduced downtime for reliable driving in all conditions. Buy online now and provide optimum support for your vehicle’s engine brake!