Knudtsen Chevrolet› Blog› Electric Steering and eBoost Brakes: Why the 2027 HD Drives Differently The 2027 Silverado HD drives differently because GM swapped the hydraulic power steering for an electric system and added an electronic brake booster it calls eBoost. GM says both are firsts for the heavy-duty pickup segment. The new diesel gets the headlines, but when HD shoppers test drive one at Knudtsen Chevrolet in Post Falls, these are the two changes we expect them to notice first. Our 2027 Silverado HD overview covers engines, pricing and technology for the whole truck, and the Silverado HD trim levels page compares all six trims. For the full list of 2027 changes, see everything new on the 2027 Silverado HD. About 30% More steering power than the hydraulic HD system (GM) 14.6-inch Front brake rotors 4-piston Fixed front calipers 0 Power steering pumps, hoses or fluid New Inventory Pre-owned Inventory New Vehicle Specials Contact Us What is electric power steering on the 2027 Silverado HD? It's an electric rack-and-pinion system that replaces hydraulic steering, and GM says it has about 30% more power than the hydraulic gear on current HD trucks. There's no steering pump, no hoses and no fluid. The practical difference is that GM says the electric system delivers full assist regardless of engine speed. Think about backing a gooseneck into a tight spot at the shop, or working a plow truck back and forth across a lot at walking pace. That's low rpm, heavy front end, lots of steering input, and it's where the new setup should earn its keep. GM also says the system has redundancy built in. And because the assist is electronic, the truck can change how the steering behaves by drive mode, which comes up again below. What is eBoost? eBoost is GM's electronic brake booster for the 2027 Silverado HD, and GM pairs it with bigger brake hardware. GM says the new system shortens pedal travel and can catch problems like brake fade or a leak sooner. Brake system change What GM has announced Brake boost eBoost electronic brake boost, a segment first per GM Front rotors 14.6 inches, larger than before Front calipers New four-piston fixed calipers Rear brakes Upgraded hardware Pedal Shorter travel Driver assistance Supports Adaptive Cruise Control and Automatic Emergency Braking Diagnostics Detects fade or leaks sooner GM describes the brake hardware for the 2027 Silverado HD lineup. Detailed brake specifications by trim and configuration are not yet released. Shorter pedal travel is the part you'll notice on a test drive, especially if you're stepping out of an older HD you've driven for years. Why split steering and brakes apart? GM says the electric steering and eBoost together eliminate the shared hydraulic source that steering and braking used to rely on. In plain terms, the two systems no longer draw on the same fluid circuit. For owners, that means fewer parts in common between the two things you least want to lose on a loaded truck. Add GM's built-in steering redundancy and the earlier brake fault detection, and the design is clearly aimed at heavy, long-haul use. There's a maintenance angle too. With no power steering pump, hoses or fluid, there's no power steering fluid to top off. Bring the truck to our Knudtsen Chevrolet service department for its scheduled visits and ask our technicians what's changed under the hood. How do the new steering and brakes work with a trailer? In Tow/Haul mode, the 2027 Silverado HD adjusts both steering and brake boost for the load, and Chevrolet says it adds steering damping for better trailer control. Chevrolet's stated goal for that extra damping is trailer control. On the brake side, Tow/Haul works alongside the exhaust brake and grade braking so the service brakes do less of the work on long downhills. We cover that part in detail in our 2027 Silverado HD towing guide, including the I-90 passes east of town. Bigger rotors matter most here. A truck at its gooseneck limit with the 8.3L Duramax is asking a lot of its brakes, and that's where larger front rotors and fixed calipers earn their place. What is Terrain Mode? Terrain Mode is a one-pedal off-road setting on the 2027 Silverado HD ZR2. It works in 4HI and 4LO, and when you lift off the accelerator, the truck applies the brakes for you. GM says it's a first for its heavy-duty trucks. Off-Road mode is a separate setting that lets the wheels slip more before traction control steps in. Terrain Mode goes further and lets you control speed on slow, rough ground with one foot. Chevrolet lists Terrain Mode for the ZR2. See the ZR2 on our 2027 Silverado HD trim comparison. Do the new steering and brakes come on every 2027 HD? GM presents electric power steering and eBoost as part of the 2027 Silverado HD, not as trim options or packages. Chevrolet hasn't released full equipment lists by trim yet, so we'll confirm on the specific truck you're looking at. If you're deciding whether these changes are worth waiting for, our 2026 vs 2027 Silverado HD post weighs them against the trucks still available. Drive the 2027 Silverado HD in Post Falls Steering and brakes are hard to judge from a spec sheet. Browse 2027 Silverado HD inventory or ask our team to set up a drive so you can feel the difference yourself. Frequently Asked Questions Does the 2027 Silverado HD have electric power steering? Yes. The 2027 Silverado HD uses electric rack-and-pinion power steering in place of hydraulic steering. GM says it has about 30% more power than the current HD hydraulic system and gives full assist at any engine speed. What is eBoost on the 2027 Silverado HD? eBoost is GM's electronic brake booster. It shortens pedal travel, supports Adaptive Cruise Control and Automatic Emergency Braking, and can detect brake fade or a leak sooner. GM says it's a first for the heavy-duty segment. How big are the 2027 Silverado HD front brakes? GM lists 14.6-inch front rotors with new four-piston fixed calipers for the 2027 Silverado HD, plus upgraded rear brake hardware. Does the 2027 Silverado HD need power steering fluid? No. GM says the electric power steering system has no pump, no hoses and no fluid. What is Terrain Mode on the Silverado HD ZR2? Terrain Mode is a one-pedal off-road driving mode on the 2027 Silverado HD ZR2 that works in 4HI and 4LO. Lifting off the accelerator applies the brakes, and GM says it's a first for its heavy-duty trucks.