4 post lifts are commonly used in shops, inspection bays and heavy duty service facilities. They provide a simple way to raise a vehicle up to the frame level, but often do not lift the wheels off of the surface of the lift. Bridge jacks are a great tool to provide the additional lift needed for most repairs.
A bridge jack is used between the runways of a 4-post lift. It allows for lifting the frame or axle of a vehicle. Perfect for working on wheels, brakes and suspension. Make sure to choose the correct size for easy service in your shop.
What Is a Bridge Jack?
A bridge jack, also known as a rolling jack, is a hydraulic lifting device that is used on a 4-post lift system. This type of jack will roll along rails that run between the lift runways, allowing it to lift either the front or the rear of the vehicle.
Bridge jacks are commonly used for:
- Tire and brake service
- Suspension repairs
- Wheel alignment preparation
- Undercar inspections
Used in repair work that requires hanging the wheels.
Why the Right Bridge Jack Matters
Not all bridge jacks are suitable for every lift. Using the wrong jack model may result in:
- Improper load distribution
- Reduced lifting efficiency
- Compatibility issues with lift rails
- Increased safety risks
Proper bridge jack application will help to ensure that the bridge can be safely lifted and maneuvered for inspection and repair.
Key Factors to Consider When Choosing a Bridge Jack
1. Lift Capacity
Lifting capacity is a very important factor in selecting a suitable jack for your application. The jack will be carrying the weight of the part of the vehicle that you are going to lift.
Common bridge jack capacities include:
- 6,000 lb – Suitable for passenger vehicles
- 7,000–9,000 lb – Ideal for SUVs and light trucks
- 15,000 lb or more – Required for heavy commercial vehicles
Many heavy vehicle workshops use heavier truck jacks.
2. Compatibility with Your 4-Post Lift
Bridges Jacks The width and rail configuration of your bridge jack must match your lift. Here are some important measurements to consider:
- Distance between runways
- Rail design and mounting system
- Minimum and maximum jack width
Choosing a compatible jack ensures smooth movement along the lift tracks.
3. Hydraulic vs Air-Hydraulic Systems
Bridge jacks are typically powered by:
- Manual hydraulic systems
- Require hand pumping
- Suitable for low-volume workshops
Air-hydraulic systems
- Powered by compressed air
- Faster and easier operation
- Ideal for busy service centers
Many professional shops prefer air-hydraulic models because they improve productivity.
4. Lift Height Range
Some repairs require different lift heights than can be provided by a typical scissors lift. A bridge jack can provide additional height. It should be enough to lift the vehicle wheels well above the lift table.
A good lift range ensures:
- Comfortable working height
- Better wheel clearance
- Improved technician access
5. Adjustable Support Arms
Bridge Jacks with Adjustable Lifting Arms Between the solid steel base and hydraulic cylinder, is a sturdy adjustable lifting arm. The arm provides great flexibility in lifting the wide variety of vehicles that have to be jacked.
Adjustable arms help technicians:
- Align the jack with factory lift points
- Support uneven vehicle structures
- Lift both small cars and larger vehicles safely
6. Safety Features
Safety should always be a priority when selecting lifting equipment.
Look for features such as:
- Mechanical safety locks
- Overload protection valves
- Anti-slip lifting pads
- Reinforced frame construction
These features help maintain load stability and prevent accidental lowering.
Benefits of Using the Right Bridge Jack
Choosing the proper bridge in several ways:
Improved Efficiency
Techs can quickly hoist and service the wheels without having to pull the vehicle off of the lift.
Better Safety
Stable lifting reduces the risk of vehicle shifting or jack failure.
Versatility
A properly selected bridge jack can accommodate a wide range of vehicles.
Enhanced Productivity
Faster lifting operations allow workshops to service more vehicles each day.
Bridge Jacks for Heavy-Duty Applications
Some shops have commercial fleets, large buses or trucks and the need for bridge jacks with higher capacities and longer-lasting durability.
In such cases, a truck jack or a high capacity bridge jack is used to lift heavier vehicles.
Conclusion
When it comes to bridge jacks for a 4-post lift, there are a number of things that you should consider. Some of the more important points to keep in mind are the capacity of the jack, the ability of the jack to interface with your lift and other components, hydraulic or pneumatic power, and the level of safety provided by the equipment.
A well designed bridge jack will improve productivity in the workshop, protect the safety of workshop personnel, and provide the necessary capacity to pick up a wide variety of different vehicles. With design advances by companies such as Stan Design, manufacturers have developed high quality, accurate bridge jacks that enable today’s automotive repair facilities to carry out their repair work efficiently and effectively.