From CHiPs Online:
Ponch and Bobby chase after car radio thieves and Ponch takes a big spill over a car and into a van. At the hospital, Bobby is pretty worried about Ponch, but he comes out with just a broken left arm.
Two weeks later, he's begging Getraer to let him work again. Getraer gives him light duty with the CHP Explorers (aka Brat Patrol). On patrol, Bruce witnesses a drug deal and chases after the dealer. He catches the dealer after he gets flat tires.
Back at Central, Getraer chews out Bruce for doing it solo and arresting without evidence. He assigns Bruce to assist Kathy in the follow up. Meanwhile, Ponch meets the rag-tag group of kids known as the Brat Patrol. After sending them home to get in uniform, they meet the LAPD Explorers and challenge them to a race. They lose. After they finish washing all the LAPD and CHP cars, Kathy and Bruce are out looking for the drug dealer.
Later on, the Brat Patrol spots guys breaking into cars. Ponch and Bobby make the bust. Back at Central, the Brat Patrol wants more and listens to the LAPD on a scanner. They're spotted by the police and returned to Ponch. Meanwhile, Bruce and Kathy bust the drug dealer.
While the Brat Patrol is practicing, Ponch talks to C.T.'s mother to convince her to let C.T. stay an Explorer. When they meet the LAPD Explorers in a rematch of the relay race, Artie finishes just barely in front of the LAPD racer.