OEM ABS Pump Assembly for 2020-2023 Buick & Chevrolet • Encore GX, Trailblazer

Before buying an ABS pump assembly, consider these factors:

• Condition: Decide whether you want a used, refurbished, or new aftermarket part.
• Warranty: Check the warranty offered. A longer warranty provides more peace of mind.
• Reputation: Buy from a reputable seller with good reviews.
• Compatibility: Make sure the part is specifically designed for your Buick Encore GX or Chevy Trailblazer model year.
• Completeness: Confirm what's included. Some assemblies come with the ABS module, while others don't.

Quality indicators:

• Used OEM: Look for parts that have been tested and inspected to ensure they meet factory standards.
• Refurbished OEM: Check if the part has been professionally restored with new components.
• New Aftermarket: Research the brand and read reviews to ensure the part is reliable.

Typically included:

• The ABS pump motor
• The hydraulic control unit
• Sometimes, the ABS module (ECU) is included, but not always

Replacing an ABS pump assembly can be moderately difficult.

• Difficulty Level: Medium
• Estimated Time: 2-4 hours

Special tools needed:

• Scan tool for ABS bleeding
• Line wrenches
• Socket set
• Torque wrench

Critical steps and tips:

1. Disconnect the negative battery cable.
2. Locate the ABS pump assembly.
3. Disconnect the brake lines and electrical connectors. Be careful not to spill brake fluid.
4. Remove the old ABS pump assembly.
5. Install the new ABS pump assembly.
6. Reconnect the brake lines and electrical connectors.
7. Bleed the ABS system using a scan tool. This is crucial for proper operation.
8. Reconnect the negative battery cable.
9. Test the brakes to ensure they are working properly.

DIY or Professional Installation:

• While a mechanically inclined person can do this job, professional installation is recommended. Bleeding the ABS system requires a scan tool and expertise. Improper bleeding can lead to brake failure.

There are three main options when buying an ABS pump assembly: used OEM, refurbished OEM, and new aftermarket.

• Used OEM: These are genuine factory parts taken from used vehicles. They offer excellent value because they are tested and inspected to meet factory standards but cost less than new parts.
• Refurbished OEM: These are factory parts that have been professionally restored with new components. They offer a balance of quality and affordability.
• New Aftermarket: These are brand new parts made by third-party manufacturers to meet OE specifications. They can be a good option if you want a new part and are on a budget.

Consider replacing these parts at the same time:

• Brake fluid: Old brake fluid can damage the ABS system.
• Brake lines: If the brake lines are corroded, replace them.
• Wheel speed sensors: Faulty wheel speed sensors can cause ABS problems.

Replacing these parts can prevent repeat failures by ensuring the entire braking system is functioning optimally. Contaminated brake fluid or faulty sensors can put extra stress on the new ABS pump assembly.

An ABS pump assembly typically lasts for 100,000-150,000 miles or 7-10 years.

Factors that affect longevity:

• Driving habits
• Environmental conditions (e.g., road salt)
• Brake fluid maintenance
• Quality of the replacement part

• Used OEM: $150 - $350
• Refurbished OEM: $300 - $500
• New Aftermarket: $400 - $700

Labor cost:

• Professional installation typically costs $200 - $400, depending on the shop and location.

Total job cost estimates:

• Used OEM: $350 - $750
• Refurbished OEM: $500 - $900
• New Aftermarket: $600 - $1100

Some 2020-2025 Buick Encore GX and Chevy Trailblazer models have experienced issues with ABS module failure due to internal electrical problems. Check for any Technical Service Bulletins (TSBs) related to ABS issues for your specific model year. Some owners have reported premature ABS pump failure, possibly related to aggressive driving or harsh weather conditions.

After installing the new ABS pump assembly:

1. Start the engine and check for ABS warning lights on the dashboard. The lights should turn off after a few seconds.
2. Drive the vehicle and perform several test stops to ensure the brakes are working properly.
3. Listen for any unusual noises from the ABS system during braking.
4. Use a scan tool to check for any ABS codes.
5. Verify that the ABS system is activating during hard braking on a safe surface. You should feel a pulsation in the brake pedal.

Q: How do I know if my ABS pump is bad?
A: Common signs include the ABS warning light being on, reduced braking power, and unusual noises during braking. A scan tool can confirm the issue.

Q: Can I drive with a bad ABS pump?
A: It's not recommended. While your regular brakes will still work, the ABS system won't function, increasing your stopping distance in emergency situations.

Q: Do I need to bleed the brakes after replacing the ABS pump?
A: Yes, bleeding the ABS system is essential after replacing the pump to remove air from the lines and ensure proper operation. A scan tool is usually required for this process.

Q: What is the difference between a used, refurbished, and new aftermarket ABS pump?
A: A used OEM pump is a genuine factory part from a used vehicle, offering good value. A refurbished OEM pump is a factory part that has been restored with new components. A new aftermarket pump is a brand new part made by a third-party manufacturer.

Q: Is it difficult to replace an ABS pump myself?
A: It's a moderately difficult job that requires some mechanical skill and special tools, including a scan tool for bleeding the ABS system. Professional installation is recommended.

OEM Part Numbers:

• GM: 42708212, 42742904, 60004350, 60005988, 84652993, 84762289, 84857009

Fits Years: 2020 2021 2022 2023