OPINION OF THE COURT

This appeal raises the issue whether the trial judge erred in refusing to admit into evidence a service letter distributed by the Ford Motor Company to its dealers indicating a possible defect in the construction of certain vehicles. Here, the driver of a 1963 Ford Econo-line appeals from an adverse jury verdict in his products liability action.

It was appellant’s contention at trial that while he was driving home after work, after spending several hours in a roadside tavern, his vehicle veered out of control and struck a guard railing, causing him to sustain serious injuries. At trial, he advanced the theory that the right front brake hose was installed with a “reverse twist” at the time of manufacture, and that this improper installation caused the brake hose to become abraded and to blow out, causing his vehicle to swerve into the railing.

He offered to introduce into evidence a service letter sent by Ford to its dealers, approximately two years prior to the accident, warning that in certain Eeonolines “some front brake wheel supports * * * may have been bent out of proper position.” The trial judge ruled the service letter inadmissible.

The trial court has great discretion in determining the admissibility of evidence, which will not be disturbed on appeal absent a finding of abuse. Control Data Corp. v. International Business Machines Corp., 421 F.2d 323 (8th Cir. 1970).

We find that the trial court did not abuse its discretion. Indeed, the letter was irrelevant to appellant’s theory of the case. Appellant contended that an improperly installed brake hose caused the accident. The service letter, however, spoke of the possible improper installation of front brake wheel supports. Although appellant urged that the improperly installed front brake wheel support rubbed against the brake hose causing it to become abraded and eventually blow, he presented no testimony that the condition described in the service letter existed on the subject vehicle. Clearly, *317 brake hose abrasion can result from causes other than friction from the brake wheel support.

The judgment of the district court will be affirmed. 1