What to Do If Your Brakes Fail: ABS, Engine Braking, and Emergency Parking Brake

© A. Krivonosov

If the brake pedal sinks to the floor or the car stops slowing down, the first moves have to keep the vehicle under control. Don’t immediately shut off the engine, shift into P, or yank the mechanical parking brake hard: any of those can rob you of power steering assist, lock the rear wheels, or damage the transmission.

Start by lifting off the gas, switching on the hazard lights, and warning nearby traffic with the horn. At the same time, look for an open lane, an uphill grade, an emergency runaway ramp, or any stretch of road where the car can bleed off speed without a head-on impact.

What to do with the pedal depends on how it fails. If it sinks straight to the floor, a few rapid pumps can sometimes temporarily rebuild pressure in the hydraulic circuit. If the pedal stays firm and the car has a working four-channel ABS, press hard and hold: the system modulates pressure on its own and doesn’t need “pumping.” On a car without ABS, repeated pumping helps avoid a prolonged wheel lock-up.

The next tool is engine braking. On a manual, downshift progressively—don’t jump straight from a high gear to first. On an automatic, use the manual mode, positions 3, 2, 1, or L, depending on how the transmission is set up. Slamming into the lowest gear at high speed can trigger a skid and overload the drivetrain.

Apply the parking brake gradually. A mechanical lever should be pulled smoothly, keeping the option to ease off if the rear end starts to slide. On many cars with an electronic parking brake, emergency braking is triggered by holding the EPB button, but the exact procedure should always be checked in that specific model’s manual. Hyundai, Ford, and Toyota explicitly build in this mode, with a warning that stopping distance will increase.

Don’t kill the engine before the car has fully stopped. Doing so can sharply cut power assist for the brakes and steering, and on some cars it disables part of the safety electronics too. Shifting to neutral isn’t a good idea either, as long as the engine can still help slow the car.

Deliberately scraping the car along a guardrail isn’t a standard stopping technique. It’s a last resort, for when there’s no open path left and a collision is already unavoidable. It’s far better to steer toward an emergency ramp, an uphill grade, or a soft, open shoulder, keeping the car as straight as possible.

Once stopped, don’t keep driving even if the pedal suddenly feels normal again. The cause could be a fluid leak, overheating, a failed master cylinder, a bad vacuum booster, or an electronic fault. The car needs to go to a shop on a flatbed.

Expert Dmitry Novikov advises studying the manual gearbox mode and the electronic parking brake in advance. That’s especially relevant as brake-by-wire systems spread: SPEEDME.RU has previously reported how Brembo began replacing the mechanical link with electronic brake control.

Prevention lowers the risk of a full brake failure. Check not just pad thickness, but also fluid level and service life, line integrity, rotor condition, and any ABS warnings. The outlet has previously explained why summer car prep should start with a brake inspection, not a random parts swap.