From Longman Dictionary of Contemporary Englishslam on the brakesslam on the brakesTTCto make a car stop very suddenly by pressing the brakes very hard → slam
Examples from the Corpus
slam on the brakes• If they don't agree on promotion, the stadium's financial backers may slam on the brakes.• My friend grabbed my arm and yelled and I slammed on the brakes.• Death Horror-struck, all he could do was slam on the brakes and pray.• All she could do was to slam on the brakes and shut her eyes.• I slammed on the brakes, skidding to a stop.• The driver slammed on the brakes; the Jeep screeched to a halt. 