Kenworth Makes the Electronic Parking Brake Standard, Retiring the Red and Yellow Knobs

Kenworth has had the hardware since late 2025, when Bendix's Intellipark electronic parking brake became a factory option on Kenworth heavy- and medium-duty models and on Peterbilt's heavy-duty, medium-duty and 520 lines. As Transport Topics reported at the time, the system does considerably more than relocate the control: parking brakes apply automatically if the driver leaves the seat without setting them, trailer brakes release when the tractor begins to move, and a Smart Unpark interlock reads door position, seat belt status and vehicle movement before it will let the truck park or roll.

The function has migrated from a pneumatic valve the driver pulls to a network of switches, sensors and a control module. Kenworth kept the familiar symbols on the new switches, which is sensible for driver training, but it does not change what sits behind the dash.

For a parts counter the practical effect is two populations of Kenworths in service at once. Every 2.1-meter Class 8 truck ordered from here on carries the electronic system; everything already on the road keeps its manual valves, and those trucks have another decade of work in them. A park brake complaint on a 2024 tractor and the same complaint on a 2027 tractor are now different repairs sharing no parts.

The failure modes diverge as well. A manual system fails as an air leak or a sticking valve. An electronic one can fail at a door switch, a seat belt sensor, a harness or the module — a truck that will not release its parking brake because an interlock disagrees with reality is a diagnostic problem, not a pneumatic one. The refreshed cab also prepares these trucks for PACCAR Connect, due to be fully available in early 2027, so more of that diagnosis will run through connected data than through a gauge and a soap bottle.

Two things are worth doing now. First, if you run a mixed Kenworth fleet, establish which park brake architecture each unit actually left the factory with before you order anything — Kenworth drew the line at the 2.1-meter cab rather than at a model name, so a T680 or T880 on either side of the change looks identical on a work order. Checking the model and model-year specs for each Kenworth is the quickest way to pin that down.

Second, do not let the manual valves drop out of your stocking plan. The installed base running them is large and aging, and when one fails on an older unit, running the interchange on the dash valve part number is usually faster than waiting out an OEM backorder. For technicians meeting the electronic system for the first time, start from the symptom rather than the schematic: a park brake that will not release on an interlocked truck is an input problem, and the diagnostic guides for air and park brake symptoms walk those inputs in order.

The new interior is on order sheets now, and the electronic brake is standard on every new 2.1-meter cab Class 8 truck, per Kenworth's announcement. Spec accordingly: it is coming whether or not you asked for it.