After You Lower It: Alignment Timing, Driver-Assist Calibration and Headlight Aim
Get an alignment after coilovers go in, but only once the car has settled and the ride height is final. Then ask whether your driver-assist cameras, radar and headlights need checking, because a height change can affect all three.
The coilover kit is on. The stance looks right. It is tempting to drive straight to the alignment shop. Settle the car and confirm the height first. The order you do things in decides whether you pay for one alignment or three. This guide covers when to align, what to tell the shop, why driver-assist systems may need calibration and how to handle headlight aim.
Why Ride Height Changes Your Alignment
Your suspension moves in arcs, not straight lines. When you lower the car, the control arms sit at new angles. That changes camber and toe at every corner, even if you never touched an alignment bolt. Any ride height change calls for an alignment. That holds whether you dropped it an inch or raised it back up for winter.
Toe is the big one for tires. A small toe change scrubs the tread across the road on every mile. Camber matters too. Lowering often adds negative camber, which wears the inner edge if it goes too far for how you drive. Our guide to suspension geometry and alignment covers the angles in depth.
When to Get an Alignment After Coilovers
Do not align before the car has settled on its wheels. Let everything settle first. New springs seat into their perches, and bushings take a set under the car's weight. If height moves after the alignment, so do camber and toe.
Step 1: Set ride height and lock it. On full-length kits like BC Racing and Fortune Auto, you set height at the lower mount. The spring perch sets preload. Tighten every locking collar.
Step 2: Settle it. Roll the car and bounce each corner before you measure. Then drive gently, straight to the alignment shop.
Step 3: Re-measure. Measure hub to fender at all four corners on level ground. If anything moved, reset it and settle it again.
Step 4: Corner balance, if you plan to. Corner balancing changes the height at each corner, at the spring perch or the lower mount. Do it before the alignment, not after.
Step 5: Align. Now the numbers will hold.
Drive gently until then. If the car pulls hard or the steering wheel sits far off center, the toe is likely way out. Get to a shop sooner rather than wear a tire bald on the way. Our guides on how to set ride height on coilovers and corner balancing walk through steps 1 to 4.
What to Tell the Alignment Shop
A good alignment tech can work with any coilover kit. They just need to know what they are looking at. Bring this information with you.
Tell the shop
The car has coilovers, and which brand. Your measured ride height at each corner, so they can confirm nothing moved. Whether you have camber plates or camber-adjustable upper mounts. The specs you want: factory, or a street or track setup you have chosen. How you use the car: daily, autocross, track days or drift.
Ask for a printout of the before and after numbers. Keep it. If the car changes later, you have a baseline.
Lowered cars sometimes run out of factory camber or toe adjustment. That is where adjustable parts come in. BC Racing kits ship with camber-adjustable upper mounts on most applications. Some BC Racing listings, like the BC Racing 2005 to 2007 Impreza STI kit, note rear camber plates are ordered separately. We list rear camber plates for BC Racing coilovers for certain models. Whiteline makes camber adjusting bolts, such as the Whiteline KCA417 front camber bolt listed for older Toyota Camry and Celica models. It also makes adjustable arms, such as the Whiteline KTA216A rear lower arm assembly for camber and toe correction. Confirm fitment for your car before ordering either.
Driver-Assist Cameras and Radar After Lowering
This is the part most people miss. Lane-keep assist, adaptive cruise and automatic emergency braking rely on cameras and radar. Those sensors are aimed at the road from a known height and angle. Change the height or the rake of the car, and that aim can shift.
Manufacturers say so in their service information. As of October 2026, here is what three sources show:
Ford. Ford's Collision Position Statement is dated May 1, 2026. It says Ford's driver-assist systems are designed and tested for the original ride height, wheel offset and suspension geometry. Ford says it does not validate or support ADAS performance on cars with non-OE suspension components, such as lowering kits.
Toyota. I-CAR's OEM calibration database lists a change in ride height as a calibration trigger for several cameras on the 2024 Grand Highlander Hybrid.
Subaru. The same database lists steering angle sensor calibration on the 2016 Crosstrek "If wheel alignment is performed". It also lists it "If suspension parts are removed, adjusted, or replaced". The rear height sensor needs it if suspension parts are removed, installed or replaced.
These are examples, not rules for every car. Requirements vary by make, model, year and system. Before your alignment, look up your car in the manufacturer's service information, or ask a shop that does ADAS calibration. Some alignment shops do both in one visit.
Watch for warning lights or odd behavior after the install. A lane-keep system that tugs the wheel or an emergency-braking warning on an empty road is a sign to get it checked. Passive coilovers have no wiring of their own, so the coilover is not the fault. The new height is.
One more check while the wheels are off. Lowering does not change the gap between the ABS sensor and its tone ring, because they move with the hub. The real risk is a sensor cable that gets stretched or rubs at the new height. Route and clip it so it has slack at full droop and full lock.
Headlight Aim After a Height Change
Headlights are aimed with the car at its factory height and rake. Drop the front more than the rear and the beam points lower. Drop the rear more and it climbs toward oncoming drivers. Either way, have the aim checked after your coilover kit is set.
Many alignment and inspection shops can check aim with a screen or an aiming tool. If your car has automatic headlight leveling, ask whether its ride height sensors need resetting. The Subaru example above is a reminder that height sensors are on the calibration list for some cars.
Some places also set rules on headlamp height. Rules vary by state and province, so check the rules where you live. This is general information, not legal advice.
A Simple Order of Operations
Put it all together and the sequence looks like this.
After lowering
Install and torque to spec. Set ride height and lock the collars. Roll and bounce the car, then re-measure. Corner balance if you plan to. Align. Check ADAS calibration needs for your car. Check headlight aim. Re-check torque on the coilover hardware after the first week of driving.
If you change ride height again later, run the list again from the start. That includes winter height changes on a daily driver.
A note on unsprung weight, since people ask: an alignment does not change it. Unsprung weight is the mass the springs do not carry, like the wheel, tire, hub and brakes. Alignment changes angles, not mass. What it does change is tire wear, straight-line stability and how the car turns in.
Brands, Kits and Getting It Right the First Time
Every brand we carry needs the same after-care. KW, Bilstein, TEIN, Öhlins, BC Racing and Fortune Auto kits all change geometry when they change height. The kit decides how much adjustment you have. Your spring rate and damping choices decide how the car feels. The alignment after coilovers decides whether your tires last and whether the car tracks straight.
If you run BC Racing, Swift Springs SPEC-R springs are an upgrade option on most fitments. Ask about them when you order. Any spring change means re-checking ride height and alignment, so plan it with the rest of the setup.
Good performance suspension is the whole setup working together. Height, alignment, sensors and lights all have to agree before the job is done.
Frequently Asked Questions
How soon should I get an alignment after coilovers?
After the car has settled and the ride height is final. Set height, roll and bounce the car, re-measure and reset if needed. Corner balance if you plan to, then align. Recheck height after the first week of driving, and realign if it has moved.
Do I need an alignment every time I change ride height?
Yes. Any height change moves camber and toe. Even a small adjustment can change toe enough to wear tires. Re-align whenever you change ride height, including seasonal changes.
Does lowering my car affect lane-keep assist or emergency braking?
It can. Cameras and radar are aimed from the factory height. Ford says it does not support ADAS performance on cars with non-OE lowering parts. Some manufacturers list ride height changes as a calibration trigger. Check your car's service information or ask an ADAS calibration shop.
Does a wheel alignment reset the steering angle sensor?
Not on its own on every car. Some cars need a separate calibration after an alignment. For example, the 2016 Subaru Crosstrek lists steering angle sensor calibration after a wheel alignment. Ask your shop to check what your car needs.
Should I adjust my headlights after installing coilovers?
Have the aim checked. A change in height or rake moves the beam up or down. Some places also have headlamp height rules, so check the rules where you live. This is general information, not legal advice.
Should I corner balance before or after the alignment?
Before. Corner balancing changes the height at each corner, at the spring perch or the lower mount. That changes the alignment. Balance first, then align.
What if the shop runs out of camber adjustment?
That happens on some lowered cars. Camber plates, camber-adjustable upper mounts or camber bolts can add range. BC Racing kits ship with camber-adjustable upper mounts on most applications. Call us with your car and we will check what fits.
Questions About Setup After Your Install?
Getting the order right means fewer alignments and longer tire life. If you are unsure how far to drop, what camber parts fit or which kit gives you the range you need, call 1-800-460-9106. Tell us your car and how you drive it, and we will help you plan the setup.
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