Open the hood on your Honda and look at the brake fluid reservoir first. An ABS warning light that appears right after a brake service falls into three predictable categories, and the first one has nothing to do with the ABS module itself. Driven Auto Care of San Jose works with Santa Clara Honda owners from our San Jose shop on exactly this scenario, and the answer is almost never the expensive part the customer fears. Here are the three things that cause the light, in the order we check them. Cause One: Fluid Level Dropped Too Low During Pad Retraction Installing new brake pads on a Honda requires pushing the caliper piston back into its bore to make room for the thicker pad material. That retraction displaces brake fluid from the caliper back toward the master cylinder reservoir. A tech who opens the caliper bleeder screw during retraction (the right move on a VSA-equipped Honda, because it prevents dirty fluid from flowing backward through the modulator) can lose enough fluid from the reservoir to trip the low-level sensor if the level started on the low side. The ABS module sees the level drop and sets a code. The fix is a fluid top-off and a code clear, and the light stays off permanently. Cause Two: A Wheel Speed Sensor Got Bumped Out Of Alignment The wheel speed sensor on a Civic, Accord, or CR-V mounts near the hub and reads a toothed tone ring on the axle. The sensor wire routes through the caliper bracket area on 2006–2011 Civic, 2008–2012 Accord, and 2007–2011 CR-V, which means a caliper pulled off without care can tug the wiring or shift the sensor position by a fraction of a millimeter. A shifted sensor reads an inconsistent signal, and the ABS module stores a wheel speed sensor fault code. We test each sensor's output with the car on a lift and a scan tool running live data, and we reseat the sensor or replace a damaged pigtail connector as needed. Cause Three: The VSA Modulator Has Trapped Air From A Fluid Flush If the brake service included a fluid flush, the trapped air explanation applies. Honda's VSA modulator has internal hydraulic chambers that need their own bleed cycle during a flush. A manual bleed at each caliper alone leaves air trapped inside the modulator valves, and the system detects the pressure differential and sets a code that no amount of wheel bleeding will clear. The Insider Beat Most Shops Skip Honda's documented VSA bleed procedure requires a scan tool capable of activating the modulator solenoids in a specific sequence while the tech bleeds each wheel. The scan tool cycles the internal valves and pushes air out of the modulator chambers that a manual bleed cannot reach. Shops without the right scan tool coverage finish the job, return the car, and watch the customer pull into their next shop asking why the ABS light came on after a brake service. Driven Auto Care of San Jose runs the VSA bleed correctly every time, because the repair is incomplete without it. What We Won't Do, And What We Will We won't clear the code and send you home, hoping it stays off. We'll diagnose which of the three causes triggered your light, correct the underlying procedure step that got missed, and verify the system with a road test and a second scan before you drive away. Call Driven Auto Care of San Jose at (408) 295-3786 for a second opinion on your Honda's post-brake-service ABS warning this week.