Wabco 4721951130 ABS Modulator Valve

Description

The Wabco 4721951130 is an ABS Modulator Valve, a critical component within an automotive Anti-lock Braking System (ABS). This valve modulates brake pressure during braking events, preventing wheel lockup and maintaining vehicle control. It's typically found as part of the ABS Hydraulic Unit. With dimensions of 71x20 mm between mounting holes, this device features a rotatable exhaust venting guide and is built to OE specification standards. It connects via Bayonet ISO 15 170 A1-3.1-Sn/K1, supports port threads of 1/2 - 14 Dry seal NPTF for both ports, and operates within a temperature range of -40°C to +80°C at 12 V with a rated current of 2220 mA. Its robust IP 68 / 69 K ISO 20653 protection class ensures reliable operation even in harsh environments, while its maximum operating pressure of 11.0 bar guarantees consistent performance and durability.

Key Features & Benefits

This valve is basically the heart of your anti – lock braking system. It controls the brake pressure to each wheel individually. It rapidly opens and closes, increasing or decreasing pressure as needed, allowing your wheels to keep turning even during hard braking. It works with the wheel speed sensors and the ABS control module to make all this happen. It’s a pretty complex piece, with a bunch of valves inside all working together. Think of it as the traffic cop for your brake fluid. Your master cylinder sends fluid to this modulator, and it decides how much goes to each wheel. It gets signals from your car's computer telling it what's happening with each wheel's speed. If it detects a wheel starting to lock up during braking, the modulator quickly adjusts the pressure to that wheel, letting it keep spinning. It’s all about preventing skids and helping you maintain steering control.

Symptoms, Risks & Replacements

Well, without it, you lose the anti – lock braking function altogether. Your brakes will still work, but you won’t have that extra layer of safety. It acts like a shield against losing control during a panic stop or on slippery surfaces. You’ll notice if this thing goes bad because the ABS light on your dashboard will illuminate. Sometimes you’ll feel a pulsing sensation in the brake pedal when you brake, and that might disappear, or you might have trouble stopping smoothly. It’s a safety item, so definitely something you want to address if you suspect an issue. You can often find a replacement at places like Fixparts Online, but getting it diagnosed properly first is always the best approach.

Warranty Information

Wabco ABS Modulator Valve (MPN 4721951130) comes with a 1-year warranty.