In Gonzales v. Carmenita Ford Truck Sales, Inc. (1987) 192 Cal.App.3d 1143, the plaintiff was injured when the brakes of his truck failed. The plaintiff asserted claims for negligence and products liability against the defendant, which had sold and serviced the truck. (Id. at p. 1146.) At trial, the court declined to instruct the jury on the plaintiff's theory that the defendant had failed to give adequate warnings about the necessity for regular adjustments to the truck's airbrakes. (Id. at pp. 1147-1152.) In determining that the denial was error, the appellate court stated that warnings are in order when necessary to prevent a product from becoming unreasonably dangerous. (Id. at p. 1151.)