2587192C94 | Genuine Wabco® ABS Hydraulic Control Module Kit 12V

An ABS Hydraulic Control Module (HCU) 2587192C94 is a key part of a vehicle’s anti-lock braking system (ABS). It’s the component that actually controls brake fluid pressure at each wheel when ABS activates. ABS Hydraulic Control Module 10 coil, 12V Kit For Freightliner, Hino, Kenworth, Mack, Meritor, Peterbilt, Volvo

General Specifications

Purpose & Function

1. Driver presses the brake pedal

• Brake fluid is sent toward the wheels like a normal braking system

• The HCU is initially just passing pressure through

2. Wheels begin to slow

• Wheel speed sensors monitor each wheel

• If one wheel is about to lock, the ABS system detects it

3. ABS system sends command

• The ABS control module (computer) tells the HCU to act

4. HCU reduces brake pressure

• The HCU releases pressure to the slipping wheel

• This prevents the wheel from locking up

5. HCU holds pressure

• It temporarily holds the pressure steady

• Keeps the wheel rotating at a controlled speed

6. HCU reapplies pressure

• It reapplies braking force once traction is regained

7. Cycle repeats rapidly

• This happens many times per second

• Much faster than a human could pump brakes

Signs of Bad ABS Hydraulic Control Module

1. ABS warning light comes on

• First and most common sign

• The system detects a fault in the ABS (often HCU-related)

• You’ll see the ABS light on the dashboard

2. Traction control / stability control warning

• Since these systems rely on ABS, they may also deactivate

• You might see additional warning lights (traction or stability control)

3. Loss of ABS function

• Brakes still work, but ABS no longer activates

• During hard braking, wheels may lock up and skid

4. Unusual brake pedal feel

• Pedal may feel:

  • Too soft (spongy)

  • Too hard

  • Pulsing when it shouldn’t

5. ABS pump running abnormally

• You may hear:

  • Pump running constantly

  • Or not running at all when it should

• This points to a failing motor inside the HCU

6. Inconsistent braking behavior

• Vehicle may:

  • Pull to one side while braking

  • Brake unevenly between wheels

7. Increased stopping distance

• Especially noticeable on:

  • Wet roads

  • Snow/ice

• Because ABS is no longer managing traction properly

8. Brake fluid leaks (less common but serious)

• Internal or external leak in the HCU

• Can lead to loss of braking performance

About Wabco

WABCO (originally the Westinghouse Air Brake Company) is a global leader in vehicle control systems for commercial vehicles such as trucks, buses, and trailers. Founded in 1869 and later becoming a part of ZF Friedrichshafen AG in 2020, WABCO is best known for pioneering advanced braking, stability, and suspension technologies.