If you don't have the owner's manual, you can try:
* Online resources: Search online for "[your year] Chevy Express van fuse box diagram" or "[your year] Chevy Express van relay location." Many websites and forums dedicated to vehicle repair have diagrams.
* A repair manual: A Haynes or Chilton repair manual specific to your van's year and model will have detailed diagrams of the fuse and relay boxes.
* A local auto parts store: Auto parts store employees often have access to diagrams and can help you locate the brake relay based on your van's information.
Keep in mind that the brake system might not *have* a dedicated relay in some models; the braking system's electrical components might be controlled directly by the Body Control Module (BCM) instead of a relay. So, even after finding a relay that seems like a candidate, verifying its function is important.
