Which way to lower a car jack?

[AddysonLynn]

To lower a car, you always turn the jack's release mechanism counterclockwise (to the left). The exact method varies by jack type: turn the handle on a scissor jack or slowly open the release valve on a hydraulic floor jack. The core safety principle is to lower the vehicle slowly and in a controlled manner, ensuring no one is underneath and that the car is on stable, level ground before you begin.

The process is straightforward but demands strict adherence to safety protocols. Industry data underscores the risk: improper jack use is a leading cause of DIY automotive injuries. A controlled descent is non-negotiable. For hydraulic jacks, a quarter-turn of the release valve is often sufficient to start a gentle descent; further turning increases speed. Scissor jacks require continuous cranking of the handle.

Successful lowering is the final, critical phase of a safe lifting operation. Here’s a comparative breakdown of the two most common jack types:

Jack Type	Lowering Mechanism	Key Action	Critical Safety Note
Scissor Jack	Screw thread	Turn the provided handle/rod counterclockwise.	The car will only lower as fast as you turn. Keep a firm grip.
Hydraulic Floor Jack	Release valve	Locate the valve (usually near the base) and rotate it slowly counterclockwise.	Open the valve minimally. A sudden full open can cause a dangerous, rapid drop.

Before lowering, complete these pre-descent checks. Ensure the vehicle is in "Park" (or first gear for manual) with the parking brake firmly engaged. The immediate work area must be clear of tools, people, and pets. If you used jack stands—which is the only safe way to work under a car—you must raise the car slightly with the jack to remove the stands before lowering. The car's weight should then be fully back on the jack.

Initiate the lowering sequence. For hydraulic jacks, position yourself to the side, not in front of or under the vehicle. Apply slight, gradual pressure to the release valve. The descent should be smooth and slow. If the car drops suddenly, you are opening the valve too quickly. For scissor jacks, maintain control of the handle and crank steadily.

Once the vehicle's tires are firmly on the ground, you can fully release the hydraulic valve or finish collapsing the scissor jack. Stow the jack and any stands properly. The entire procedure, from setup to stowage, should prioritize deliberate, controlled movements to prevent damage to the vehicle and, most importantly, personal injury.

[SanAaron]

As someone who’s been wrenching in my garage for years, here’s my real-world tip. That initial quarter-turn on a hydraulic jack’s release valve is everything. You barely nudge it left. If nothing happens, nudge it a tiny bit more. You’re looking for a slow, almost graceful sink. If it plummets, you screwed up and opened it too fast. Always keep your body parts out from under the chassis. I do a final visual check for forgotten tools or stands under the car before I even touch that release valve. It’s a habit that avoids costly and dangerous mistakes.

[LeLeila]

Let’s make this simple and action-oriented.

First, confirm the car is ready to come down. Parking brake on? Transmission in Park? Jack stands removed? Good.

Now, find the release.

• If it’s the small spare tire jack (scissor jack): Grab the metal rod that came with it. Fit it into the hole on the jack and turn it to the left. The car will go down as you turn. Keep turning until the jack is loose.
• If it’s a big hydraulic floor jack: Look for a small metal dial or rod near the jack’s wheels or pump. That’s the release valve. Turn it to the left, very slowly. Use just your fingers. The car will start to lower. Let it come down gently all the way.

Once the tire is firmly on the ground, you can pull the jack out. Done.

[AmaraFitz]

I learned this lesson the hard way early on. I was in a hurry and gave the release valve a quick twist. The car dropped with a loud thud, startling me and potentially damaging the suspension. It was a wake-up call. Now, I treat the lowering process with as much respect as the lifting. I position myself so I can see the wheel and the jack clearly, and I lower it so slowly it’s almost boring. That “boring,” controlled descent is the mark of a safe operation. The goal isn’t speed; it’s ensuring the several thousand pounds of metal you’re responsible for settles back to earth without incident.

[EdwardMarie]

Understanding the mechanics explains why we turn left. Both common jack types use a simple principle: turning counterclockwise disengages or releases the load-holding mechanism.

A scissor jack is essentially a large screw. The vertical thread is what lifts the car’s weight. Turning the handle clockwise (right) tightens this screw, raising the car. Turning it counterclockwise (left) unscrews it, allowing the threaded column to collapse under the car’s weight, thus lowering it. Your turning directly controls the speed.

A hydraulic jack uses pressurized fluid in a piston chamber to lift. The release valve is a sealed gate holding that pressure. Turning the valve knob counterclockwise opens a small port, allowing the pressurized fluid to flow back into the reservoir. This release of pressure lets the piston retract, lowering the car. The key is that opening the valve just a crack creates a small, manageable escape route for the fluid, resulting in a slow drop. Opening it fully is like opening a floodgate, causing a rapid, uncontrolled descent. This is why the instruction is always to turn slowly—you are metering the flow of hydraulic fluid.