Joints > Ball Joint

A guide to hinges: everything you need to know

Ball joints are important parts of a car's suspension system, ensuring the vehicle's smooth and controlled movement. They connect the control arm to the steering knuckle, allowing the wheels to move and maintaining stability. In this guide, we'll cover the function of ball joints, types, symptoms of failure, and maintenance tips.

What is a hinge?

The pivot is a spherical joint that connects the wishbone to the steering knuckle. It acts as a pivot point between the suspension and the wheels, allowing both vertical movement and limited lateral movement. This flexibility is essential for smooth steering and a comfortable ride.

types of hinges

load-bearing hinge : carries the weight of the vehicle and is usually located in the lower control arm.
control pivot: does not carry the weight of the vehicle, but supports wheel movement and steering, often located in the upper control arm.
Closed vs. lubricated hinges: Closed hinges are maintenance-free and filled with grease at the factory, so they cannot be re-lubricated later. Lubricated hinges require periodic lubrication, which extends their service life and prevents premature wear.

failure symptoms

Over time, hinges wear out due to constant movement and dirt from the road surface. Typical signs of wear include:

• rattling or knocking sounds from the front axle
• uneven tire wear , which indicates incorrect wheel alignment
• vibration in the steering wheel , especially with increasing speed
• poor steering or difficulty maintaining straight-line driving
• wobbly wheels , which can cause dangerous driving conditions

How to check the wear of the hinges?

The following methods can be used to check the condition of the hinges:

1. Visual inspection : look for torn rubber seals, leaks, or severe rust.
2. Jack and lever testing : Raise the car and use a lever to check for excessive movement.
3. Shake test : move the wheel from side to side and up and down to detect excessive play.

hinge replacement and maintenance

When the hinges are worn, their timely replacement is essential to ensure driving safety and performance. Here are the important points:

• When to replace? Typically, the joints should be checked every 50,000 km, but replacement depends on driving conditions and the type of vehicle.
• DIY replacement vs. professional replacement: Although experienced or skilled hobbyists can replace hinges at home, it is recommended to have the work done by a professional workshop to ensure accurate installation and safety.
• Choosing the right hinge : Use quality aftermarket or OEM parts to ensure durability and fit.
• Preventative maintenance : If your hinges are greaseable, grease them regularly to extend their life and prevent breakdowns.

summary

The ball joint is a small but very important part of your car's suspension system. Regular inspection, proper maintenance, and timely replacement will help prevent accidents and costly repairs. If you notice signs of wear, fix the problem immediately to ensure a safe and smooth ride.

You can find additional car maintenance instructions and tips on our blog!