Wabco 12739086VT Expansion Unit

Description

The Expander Unit 500 is a critical component within the brake drum assembly of braking systems. It’s designed to facilitate the efficient expansion of brake shoes against the brake drum, enabling effective braking performance. This unit is manufactured by Wabco with MPN 12739086VT and adheres to OE specifications, ensuring a precise fit and reliable operation. Its dimensions are 63 x 197 x 203 mm. By maintaining optimal contact between the brake shoes and drum, this expander unit maximizes braking force and contributes to enhanced safety and control.

Key Features & Benefits

This little piece basically pushes the brake shoes outward against the inside of the brake drum. It’s what makes the brakes actually grab and stop the car. It uses a cam action – as the wheel cylinder pushes on it, it expands, forcing those shoes out. Some have multiple parts working together to get that expansion. It's all about converting hydraulic pressure into mechanical force. It lives inside the brake drum, right there with the brake shoes and wheel cylinder. It’s a key part of drum brakes – if you still have drum brakes, that is. It’s what takes the energy from the hydraulics and turns it into the stopping power you feel when you push the pedal. You’ll find one on each brake assembly, working in tandem with the other components.

Symptoms, Risks & Replacements

Well, without this working right, your brakes just won’t grab. It's like trying to squeeze something without anything to push against. If it's worn or damaged, you'll experience longer stopping distances, pulling to one side when braking, or even a spongy brake pedal. It acts like a shield, protecting the rest of the system from excessive wear. It might seem small, but it’s a pretty critical piece of the braking puzzle. You'll notice if one fails, usually as a dragging brake or a really bad vibration. A lot of folks order these from Fixparts Online because they have a good selection and decent prices, but any reputable parts store should have what you need.

Warranty Information

Wabco Expansion Unit (MPN 12739086VT) comes with a 1-year warranty.