Help identify this 80's movie

A co-worker mentioned a movie he saw in the early 80’s, but couldn’t remember the title or any stars. Here’s what he does know:

Brother and sister are driving along and are run off the road by a van-load of greasy biker-types. Both escape the exploding vehicle, but the sister is raped by the gang and later dies in the hospital. The guy’s father is a cop and warns the son not to seek revenge, but he does so anyway. The rest of the movie shows the brother hunting down and killing the gang members. When the father finds out, he goes to arrest the son, who commits suicide before he can be caught.

I tried searching the IMDB with some of the terms “rape”, “sister”, “revenge”, and so forth, but could not find the movie.
Anyone?

Ack! Lemme bump this one once.

I did a keyword search and found the following:

Young Warriors (1983) (Also Known As: Graduates of Malibu High, The). Sure sounds like what you’re looking for.

Yep, that’s it!

Thanks!