DIY

How to Replace a Front Lower Control Arm

Reading Time: 4 minutes

Control arm replacement can be difficult—especially if the vehicle’s suspension is rusted and corroded. Separating the ball joint from the steering knuckle can be tricky, too, if you’ve never done the job before. And, oh yeah, you’ll want to get your car’s alignment checked after replacing the control arm.

Front Lower Control Arm Replacement Cost

If you decide to have a professional replace your control arm, which is a smart move if you’re uncertain of your mechanical prowess, expect to pay anywhere from around $500 to well over $1,000. The job can be even more costly if you have a high-end luxury or performance car.

Should you decide to tackle the job yourself, expect to pay anywhere from approximately $50 to $100 for a new control arm. Once again, if you’ve got a fancy car, the cost may be higher.

What Tools Do You Need to Replace Your Front Lower Control Arm?

The tools needed to replace a front lower control arm vary, depending on what type of car you have. But, in general, you’ll need:

Should You Do the Job Yourself?

Front lower control arm replacement is straightforward on some cars. But on others, it can be a real challenge. The level of difficulty depends a great deal on the vehicle’s suspension design. If you’re dealing with a MacPherson strut suspension, generally, the job is pretty easy. On the other hand, if you’re working on a torsion bar suspension… well, good luck.

If you have any doubts, it’s a good idea to leave the job to a professional. You’ll save yourself a lot of blood, sweat, and tears.

If you have any doubts you can pull off control arm replacement yourself, it’s best to leave the job to a professional mechanic.

Front Lower Control Arm Replacement

Now we get to the fun part: control arm replacement. Are you ready to grab a wrench and get dirty? Good.
Before we start, however, keep in mind that all vehicles are different. Be sure to follow the repair information for your specific application. Repair manuals, such as those from Chilton, are useful but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information.

Warning: In some instances, the vehicle’s suspension spring must be compressed before removing the control arm. Failure to do so can result in severe personal injury.

Note: The following are general guidelines for educational and entertainment purposes only. Consult your vehicle’s factory information for specific repair instructions and recommended safety procedures.

The outline below describes the replacement of a front control arm in a MacPherson strut style suspension.

Control Arm Removal

1. Put on your safety glasses.

2. Use a breaker bar to loosen the wheel lug nuts. Do not remove the nuts completely at this time.

3. Safely raise and support the vehicle using a jack and jack stands. Chock the rear wheels and set the parking brake.

4. Remove the lug nuts by hand. Then remove the wheel and tire assembly.

5. Unbolt the sway bar link (if equipped) from the control arm.

6. Remove the cotter pin from the castle nut. There are many ways to do this; I prefer to use a pair of long-handled diagonal cutting pliers. Grip the circular (closed) end of the cotter pin with the pliers. Then pull the pin outward, while pushing the pliers against the steering knuckle to gain leverage.

7. Remove the castle nut from the ball joint.

8. Separate the ball joint from the steering knuckle (the joint has a taper fit and will not come out by hand). There are multiple ways to separate the two components:

9. Remove the bolts securing the control arm to the frame.

10. Remove the control arm from its mounting brackets on the frame. If the arm does not come out easily, you may need to pry it out with a pry bar.

Note: Make sure the axle shaft does not get over-extended during the control arm removal process. Damage may result.

Control Arm Installation

1. Compare the new control arm to the old control arm to be sure both are the same design.

2. Install the new control arm into the mounting bracket in the frame.

3. Reinstall the bolts that secure the control arm to the frame. Do not tighten the bolts down all the way at this time; you will torque them to specification later.

4. Slide the ball joint stud into the steering knuckle.

5. Install the castle nut on the ball joint stud. Use a torque wrench to tighten the castle nut to the manufacturer’s specification.

6. Install a new cotter pin (the control arm may come with a replacement) into the castle nut.

7. Reattach the sway bar link (if equipped) to the control arm. Use a torque wrench to tighten the retaining nut to the manufacturer’s specification.

8. Reinstall the wheel/tire assembly on the lug nuts.

9. Tighten the lug nuts until they’re snug using a ratchet and socket.

10. Safely remove the jack stands and lower the vehicle.

11. Use a torque wrench to tighten the lug nuts to the manufacturer’s specifications.

12. With the vehicle at its normal ride height, use a torque wrench to tighten the control arm bolts to the manufacturer’s specifications.

13. Take the vehicle to a repair shop and have the alignment checked by a professional.

Front Control Arm Replacement Tips

The most important tip is to read the factory repair information before attempting this job. Failure to do so can result in personal injury and property damage.

Also, if you encounter parts that are rusted or seized, apply a good penetrating oil, such as PB Blaster or, my personal favorite, Kano Kroil. Allow the penetrant to sink in overnight before you try to loosen the parts again in the morning.

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Author

Mia Bevacqua

Chief Mechanic at CarParts.com

Mia Bevacqua is an automotive expert with over 15 years of industry experience. She holds ASE Master, L1, L2, and L3 Advanced Level Specialist certification, as well as a bachelor's degree in Advanced Automotive Systems.

Throughout her career, Mia has applied her skills toward automotive failure analysis inspections, consulting, diagnostic software development, and of course, freelance writing. Today, she writes for companies around the world, with many well-known clients showcasing her work.

Mia has a passion for math, science, and technology that motivates her to stay on top of the latest industry trends, such as electric vehicles and autonomous systems. At the same time, she has a weakness for fixer-upper oddballs, such as her 1987 Chevy Cavalier Z-24 and 1998 Chevy Astro Van AWD.

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