68143491AB | Genuine Mopar® Anti-Lock Brake Hydraulic HCU For Ram 2500, 3500

An Anti-Lock Brake Hydraulic component 68143491AB refers to the hydraulic part of an Anti-Lock Braking System (ABS). It’s usually called the ABS hydraulic control unit or hydraulic modulator.

General Specifications

Fitment

Fitment can vary by engine build and options. Match the part number on the part you are replacing, or contact us with your vehicle details before ordering.

Purpose & Function

1. Prevents wheel lock-up

The hydraulic unit rapidly adjusts brake pressure so the wheels keep turning instead of skidding.

• 2. Maintains steering control
• Because the wheels don’t lock, you can still steer around obstacles while braking.

• 3. Reduces stopping distance on many surfaces
• By preventing skids, the vehicle can stop more consistently and efficiently.

• 4. Stabilizes the vehicle
• ABS hydraulic modulation helps keep the car stable during sudden or emergency stops.

• 5. Works automatically
• The hydraulic unit responds faster than a human can, pumping the brakes many times per second.

Signs of a Bad Anti-Lock Brake Hydraulic

1. ABS Warning Light On

• The most common symptom.
• Your dashboard ABS light comes on and stays lit.

2. Brake Pedal Feels Weird

You may notice:

• Spongy or soft pedal

• Pedal sinks to the floor

• Pulsating pedal even when ABS shouldn’t activate

• Hard or stiff pedal

3. Brakes Lock Up

If the unit can’t modulate pressure:

• Wheels may lock up during hard braking

• Car can skid or slide

4. ABS Engages at the Wrong Time

The ABS might activate:

• At low speeds

• On dry pavement

• For no reason
  This means the hydraulic valves may be sticking.

5. Brake Fluid Leaks

A failing hydraulic unit can leak:

• Near the ABS unit (under the hood)

• Along brake lines connected to it
  Low fluid can cause poor braking performance.

6. Pump Motor Runs Constantly

If the pump inside the ABS unit fails to regulate pressure:

• You may hear a buzzing or humming sound that doesn’t stop

7. Longer Stopping Distance

If the hydraulic valves can’t control pressure correctly, braking efficiency goes down.

About Mopar

Mopar is the official parts, service, and customer care brand for Chrysler, Dodge, Jeep, Ram, and Fiat vehicles. Originally short for “Motor Parts”, Mopar was established in 1937 and is now a global brand under Stellantis.

Mopar supplies genuine OEM parts, accessories, and performance upgrades, and it supports dealerships and technicians with tools, diagnostics, and factory-backed service. Known especially among enthusiasts for its muscle car heritage, Mopar is also a major presence in motorsports and custom vehicle culture.