MONTREAL (AP) _ Police arrested 53 people and broke up a Canadian car theft ring that made $3.25 million in seven months and peddled stolen car parts in the United States, a Quebec provinicial police spokesman said Thursday.

Spokesman Michel Martin said the center of the operation was Brady's Auto Parts Inc., a scrapyard in La Plaine, Quebec, 15 miles north of Montreal, which contained more than 800 vehicles.

He said the vehicles were stolen in Canada, brought to the yard and stripped of marketable parts which were then sold to garages throughout eastern Canada, in New York state and in New England states bordering Canada.

''If the part wasn't in stock, the caller was asked to check back in a couple of days. By then a car, bearing the badly needed part, would have been stolen,'' Martin said.

The arrests were made in 77 early-morning raids Wednesday following a seven-month investigation.

All of the suspects are Canadians, mostly from Quebec. Martin said they faced a variety of charges in court.

He said one is an official of Quebec's vehicle bureau who will be charged with complicity in the marketing of stolen cars and parts.

''It's the biggest organized (car theft) ring ever smashed in Canada,'' he said.

Martin said police still were investigating some of the garages that ordered the parts to determine if they knew they were obtaining stolen goods.