If you're unable to release the parking brake on your Chevy Silverado, Tahoe, Suburban, GMC Sierra, Yukon, or Denali a broken parking brake cable is likely the problem. The parking brake release cable and handle are a single unit that allow you to disengage the parking brake on your Chevrolet or GMC truck. Stepping on the parking brake pedal engages the parking brake but in order to release the brake you must pull the release handle which pulls the release cable and allows the brake to disengage.