2021 Peterbilt 389 Wiper Blade Sizes & Replacement Guide

Quick reference

Best aftermarket replacements

When it's time to replace the wiper blades on your 2021 Peterbilt 389, you have a wealth of excellent aftermarket options. These blades are designed to offer superior performance and durability compared to standard options, ensuring clear visibility in all weather conditions.

• Bosch ICON: (Premium Price Tier) Known for their beam blade technology, Bosch ICON wipers provide excellent all-weather performance and a long lifespan. They feature a spoiler that helps with downforce at highway speeds, crucial for a truck like the Peterbilt 389.
• Rain-X Latitude: (Mid-Premium Price Tier) These beam blades are designed to conform to the curvature of your windshield for a smooth, streak-free wipe. They are also known for their all-weather durability and easy installation.
• Trico Force: (Mid-Price Tier) Trico Force blades are robust and designed for tough conditions. They often feature a spoiler for improved high-speed performance and a high-glide treated rubber element for a smooth wipe.
• Michelin Stealth: (Mid-Price Tier) Michelin Stealth wipers combine the aerodynamic properties of a beam blade with the sturdy construction of a conventional blade. Their "Smart-Flex" design adapts to the curvature of your windshield.
• PIAA Si-Tech: (Premium Price Tier) PIAA Si-Tech wipers use silicone rubber, which provides a long-lasting, streak-free wipe and helps to repel water from the windshield, an added benefit for truck drivers.

Attachment style

The 2021 Peterbilt 389 primarily utilizes a J-hook attachment style for its wiper blades. This is one of the most common and versatile attachment types, making replacement straightforward. While some vehicles use side pin or push-button attachments, the J-hook is standard for this model, simplifying the selection of aftermarket blades.

How to install

Replacing wiper blades on your 2021 Peterbilt 389 is a simple process that can be done in a few minutes. Here's a general guide:

1. Lift the wiper arm: Gently pull the wiper arm away from the windshield until it locks into the upright position. Be careful not to let it snap back against the glass.
2. Remove the old blade: Most J-hook attachments have a small tab or button on the underside of the wiper arm. Press this tab and slide the old blade off the J-hook. You might need to wiggle it a bit.
3. Attach the new blade: Slide the J-hook through the adapter on the new wiper blade until you hear a click or feel it lock into place. Give it a gentle tug to ensure it's secure.
4. Lower the wiper arm: Carefully lower the wiper arm back onto the windshield. Repeat the process for the other side.

Note: If your aftermarket blades come with multiple adapters, ensure you select the one compatible with the J-hook attachment. Always refer to the specific instructions provided with your new wiper blades, as there can be slight variations between brands.

When to replace

Wiper blades are critical for safe driving, especially in a large vehicle like the Peterbilt 389 where clear visibility is paramount. It's generally recommended to replace your wiper blades every 6 to 12 months, or sooner if you notice any of the following signs of wear:

• Streaking: If your wipers leave lines or streaks across the windshield, the rubber element is likely worn or cracked.
• Chattering or skipping: When wipers stutter or skip across the glass, it often indicates a hardened or warped rubber blade, or insufficient pressure from the wiper arm.
• Squeaking or screeching: Loud noises during operation can be a sign of a worn blade or an improper angle.
• Incomplete clears: If areas of your windshield are consistently missed, the blade is no longer making full contact.

Regular inspection and timely replacement of your wiper blades will ensure optimal visibility and safety on the road.

Need wipers swapped fast? Find a shop on Repairius.