2019 Freightliner Cascadia — Wiper Blade Sizes & Replacement Guide

Quick reference

Notes: The 2019 Freightliner Cascadia tractor does not use a rear wiper. OEM part numbers vary by VIN/build and are best verified with a Freightliner dealer; we do not publish OEM PNs here.

Best aftermarket replacements

These popular beam-style blades are widely available. Select the 28-inch size and ensure the package specifically lists compatibility with a large/12 mm J-hook (heavy-duty) arm or includes the correct adapter.

• Bosch ICON — premium ($$–$$$). Excellent all-weather performance and longevity. For large J-hook arms, use versions/adapters that state heavy-duty or 12 mm hook compatibility; Bosch also offers HD/commercial lines if ICON packaging doesn’t list 12 mm.
• Rain-X Latitude Water Repellency — mid-to-premium ($$). Applies a water-repellent coating to the glass. Confirm the SKU includes a large-hook adapter.
• Trico Force or Trico Heavy Duty series — mid-range ($$). Designed for high-wind environments; Trico’s HD catalog specifically supports commercial truck arms and is often the easiest direct fit for Cascadia.
• Michelin Stealth Ultra — mid-range ($$). Hybrid beam design with multi-fit adapters; verify large-hook support.
• PIAA Si-Tech — premium ($$–$$$). Silicone rubber for longer life and quiet sweep; check for 12 mm hook adapter in the kit.

Tip: If a retail automotive blade only lists 9x3 or 9x4 mm J-hook (passenger car size), it will not lock correctly on the Cascadia’s larger hook. Look for “truck,” “HD,” or “12 mm J-hook” compatibility in the specifications.

Attachment style

Most 2019 Cascadias use a large J-hook (12 mm/approximately 1/2 inch). This is different from the smaller 9 mm hooks found on cars and light trucks. Some vocational or special-order arms may differ, but a standard on-highway Cascadia typically uses the 12 mm hook. If your current blade uses a side pin or bayonet/push-button, select an aftermarket blade kit that includes the appropriate adapter or consult your dealer for the exact arm type.

How to install

1. Park the truck on level ground. Switch off wipers and ignition, then lightly lift the wiper arms off the glass.
2. Identify the adapter: for a 12 mm J-hook, press the release tab on the blade’s adapter and slide the old blade off the hook.
3. Prepare the new blade. If multiple adapters are included, choose the 12 mm/large-hook piece and snap it onto the blade body.
4. Slide the arm’s hook through the adapter opening and pull until it clicks/locks. Tug gently to confirm it’s secure.
5. Lower the arm carefully to avoid snapping the blade onto the windshield.
6. Cycle the wipers and washer to verify smooth, quiet operation.

Note: If your arm uses a side pin or push-button/bayonet style, follow the insert-and-lock procedure shown in the blade’s instructions using the provided adapter. The concept is the same—secure engagement with an audible/firm click—just a different connector.

When to replace

Replace wiper blades every 6–12 months, or sooner if you notice:

• Streaking, smearing, or haze that doesn’t wash away
• Chattering, skipping, or noisy operation in rain
• Cracked, split, or hardened rubber; bent frames or damaged spoilers
• Reduced performance after exposure to extreme heat, cold, or de-icing chemicals

Fresh, properly sized blades improve visibility and reduce driver fatigue in bad weather.

Need wipers swapped fast? Find a shop on Repairius.