Wabco 8940404612 Micro Switch

Description

The Wabco 8940404612 Micro Switch is a critical component within air brake systems, specifically air valves. This switch is used to detect the position of moving parts, providing a signal to control the air brake functionality. Measuring 20 x 5 x 20 mm, this OE specification micro switch offers robust performance and ensures reliable activation within demanding applications. Its precise engineering delivers consistent and accurate signaling, contributing to enhanced brake system safety and operational efficiency.

Key Features & Benefits

These little guys are pretty simple, actually. They’re basically electrical switches that get activated when something moves. In your air brake system, they typically monitor the position of things like the brake pedal or the control levers. They don’t directly do the braking, they just tell the system that an action is happening. They have a small plunger or lever that gets pushed in, completing an electrical circuit. Think of it as a messenger. When you push the brake pedal, a micro switch detects that movement and sends a signal to the air brake controller. That controller then tells the air compressor to send air to the brakes. It confirms to the system that you intended to activate the brakes. They're also used to confirm things like the parking brake is fully engaged or disengaged. It's used throughout the air brake system to verify positions and statuses.

Symptoms, Risks & Replacements

They're crucial for safety, honestly. If a micro switch fails, the system might not know you're trying to brake, or it might think the parking brake is engaged when it isn’t. You’ll notice if one goes bad usually – you might get warning lights on your dash, or the brakes could behave erratically. Sometimes it's subtle, but it's definitely something you want to address promptly. They're a relatively inexpensive part, and replacing a faulty one is a lot cheaper – and safer – than dealing with brake failure. You can find a good selection of them at places like Fixparts Online, and they’re usually pretty straightforward to swap out if you’re comfortable doing a little work yourself.

Warranty Information

Wabco Micro Switch (MPN 8940404612) comes with a 1-year warranty.