WIPER SYSTEMS

Wiper Systems For Peterbilt Trucks

A functioning wiper system is essential for safe operation in rain, snow, and road spray — and on a Class 8 Peterbilt covering long distances through varying weather, wiper reliability isn't something to leave to chance. Commercial truck wipers use a pneumatic or electric motor to drive the wiper arms, and the system includes the motor, linkage, wiper arms, and blades. We carry wiper motors, wiper arms, wiper blades, and wiper linkage components for Peterbilt trucks to keep visibility clear in any weather.

Frequently asked questions about wiper systems

Why do my Peterbilt wipers move slowly or stop in mid-sweep?

Slow or stalling wipers on a pneumatically driven system are most commonly caused by restricted air supply — a clogged air filter on the wiper motor inlet, a kinked supply line, or low system air pressure can all reduce motor speed. On electric wiper systems, a failing motor, high-resistance wiring connection, or seized linkage pivot creates similar symptoms. Check the wiper motor air filter first on pneumatic systems — it's a frequently neglected maintenance item that dramatically affects motor performance when clogged.

How often should wiper blades be replaced on a Peterbilt?

Wiper blade replacement every 6–12 months is a reasonable baseline for most operating conditions, but drivers in dusty or abrasive environments — unpaved roads, construction zones, agricultural areas — may need more frequent replacement. A blade that streaks, skips, or leaves uncleared bands across the windshield in light rain has degraded past its useful life and should be replaced immediately. Running worn wiper blades risks windshield scratching from the hardened rubber or exposed metal wiper insert, which is an expensive consequence of a low-cost maintenance item.

What size wiper blades fit a Peterbilt truck?

Wiper blade sizing varies by Peterbilt model and year — the 579 and 389 series use different blade lengths and attachment styles. Common stud-mount and pin-style wiper arm connections require a blade with the matching adapter. Always verify blade length and attachment type for your specific model before purchasing — an inch of difference in blade length can cause the blade to contact the A-pillar or wiper motor housing at the end of its sweep. Peterbilt parts catalogs and wiper manufacturer application guides cross-reference blade size to model and year.

Other parts you might need

Shop cab filters for Peterbilt trucks