Steering Bushings for 2017 Subaru BRZ Series.Yellow

The steering rack is bolted to the subframe through rubber, which means the rack itself can move while you are turning the wheel.

Every millimeter it shifts is steering input that went into the mounting instead of your Subaru BRZ's front wheels.

What a Steering Rack Bushing Does

A rack is a steel housing containing a toothed bar that slides side to side. Turn the wheel, the pinion rotates, the bar moves, and the tie rods push the wheels.

That housing has to be held absolutely still for the system to work as intended. If the housing moves at the same time as the bar, the two movements partly cancel each other out.

Factory mountings use rubber bushings between the rack housing and the subframe, chosen to keep road noise and steering kickback out of the cabin.

Rubber is designed to deflect under load, and under steering load the rack housing shifts sideways against its mounts, and that shift subtracts directly from what the tie rods deliver.

Why Rack Movement Feels Like Slack in Your Subaru BRZ's Steering

The driver experiences it as something quite different to what it is.

Turn the wheel from center and the first fraction of input goes into deflecting the bushings rather than moving the rack bar. The wheels do not respond until that deflection is used up.

That reads as play in the steering, which is why people chase tie rod ends, ball joints and rack internals when the actual movement is at the mounting.

Steering load only makes that problem worse again. The harder you steer, the more the bushings deflect, so the system feels progressively vaguer exactly when you are asking more of it.

Letting go, the bushings spring back, which is part of why worn mounts make a car feel like it wanders rather than tracking straight.

The Toe Change Worn Subaru BRZ Steering Bushings Cause

Here is the consequence that goes beyond feel, and it is the one worth understanding.

Both tie rods attach to the same rack bar. If the entire rack housing shifts left or right in its mounts, both tie rods move with it, in the same direction by the same amount.

That pushes one wheel toward toe-in and the other toward toe-out at the same time. The alignment set on the rack is not the alignment the car has while cornering or braking hard.

The effect is a car that does not hold a line, tires that wear unevenly despite a recent alignment, and a vehicle that behaves differently turning each way because the rack has shifted in one direction more readily than the other.

That is also why a car with worn rack bushings can pass an alignment check and still drive badly.

Steering Box, Pitman and Idler Arm Bushings

Not every vehicle uses a rack, and the older arrangement has its own mounting problems.

A recirculating ball steering box bolts to the chassis rail and drives a pitman arm, which pushes a center link across to an idler arm on the opposite side.

The idler arm pivots on a bushing, and that bushing carries the entire side load of the linkage. When it wears, the center link drops or moves laterally and the steering develops the same vagueness a worn rack mounting produces.

A steering arm bushing or pitman arm bushing does a related job at the other end of the linkage.

Steering gear bushings between the box and the chassis rail matter for the same reason rack bushings do. A box that moves on its mounts is a box that is not transmitting everything you put into it.

These Are Not Steering Column Bushings

Worth separating, because the terms get mixed up and the parts are nothing alike.

A steering column bushing sits inside the column between the steering shaft and its outer tube, supporting the shaft as it rotates. When it wears, the column rattles and the wheel feels loose in the dash.

A steering rack bushing sits outside the steering system entirely, holding the rack body to the subframe. It carries load rather than supporting a rotating shaft.

Column bushing symptoms are a rattle you can feel through the wheel at idle and play when you push the wheel up and down. Rack bushing symptoms are vagueness when you turn and a car that does not hold a line.

If the complaint is noise and movement at the wheel itself, that is a column issue. If it is imprecision at the road, that is the mounting.

What Worn Subaru BRZ Steering Bushings Feel Like

The symptoms are distinctive once you know what separates them from worn joints.

Vagueness around center is the first and most common. The wheel moves through a small arc before the car responds, and the amount changes depending on how hard you are steering.

A delay rather than looseness is the giveaway. A worn tie rod end produces play you can feel as a knock. A deflecting bushing produces a soft zone with no noise at all.

Wander at highway speed follows from it, since the car needs constant small corrections and each one has to overcome the deflection before anything happens.

Uneven tire wear turns up despite recent alignments, because the toe changes under load rather than sitting where it was set.

A clunk under hard steering input appears on badly worn mounts, usually at full lock or when turning while stationary.

Steering that feels different turning left to right is the last one, and it means the rack has been shifting more readily in one direction.

Checking the Mounts Before Buying Parts

A few minutes under the car tells you whether these are the problem.

Have someone rock the steering wheel back and forth a small amount while you watch the rack housing where it bolts to the subframe. Movement of the housing itself means the bushings are deflecting.

Watch the tie rod ends at the same time. If the housing is still and the play is at the joints, the mounting is fine and the tie rods are not.

Look at the bushings directly for cracking, separation from the sleeve or rubber bulging past the mounting bracket.

Check the subframe mounting points for corrosion while you are there, since the rack mounts are low on the car and collect road spray.

Material and the Trade You Are Making

Polyurethane rack bushings hold the housing where it should be, which is the whole point of fitting them.

The rack stops moving against its mounts, so input at the wheel converts to movement at the tie rods rather than being absorbed. Response sharpens noticeably from the first drive, particularly around center.

What comes with it is feedback you did not have before. Road texture, bump steer and kickback that the rubber was filtering out now reach your hands.

On a car being driven for its handling that is information rather than noise, and most owners describe it as the steering waking up.

On a quiet commuter it can be more than wanted, which is worth considering honestly before fitting.

Replacement Cost and Access

The parts are cheap and the access decides the rest.

On some vehicles the rack mounting bolts are reachable from below and the bushings can be changed with the rack supported in place.

On others the subframe has to come down, or the rack has to be unbolted and moved, which turns a modest parts cost into a significant labor figure.

Steering rack bushing replacement is worth combining with other subframe work for that reason, since anything requiring the subframe to be dropped puts the rack mounts within reach.

Check the mounting points on the subframe while access is there, since corrosion around the rack mounts is common and a new bushing in a corroded mount achieves little.

Fitting Subaru BRZ Steering Bushings

Support the rack before releasing the mounting bolts. A rack hanging on its tie rods and the steering shaft puts load into both.

Note the rack's position before anything comes loose. The housing should go back exactly where it was, since moving it laterally changes toe on both wheels at once.

Use the correct lubricant on polyurethane, which means silicone or PTFE based rather than petroleum grease.

Torque the mounting bolts to specification with the suspension at ride height, and check the steering turns lock to lock freely before the wheels go back on.

Have the alignment checked afterward as a matter of course. Any change in rack position shows up as toe, and it is worth confirming rather than assuming.

Find Steering Bushings for Your Subaru BRZ

Sharper steering starts here, with more pivots covered across the Whiteline bushings lineup.

Select your Subaru BRZ to see the steering rack bushings and steering linkage bushings available for it. If the steering feels vague around center and the tie rod ends check out tight, the rack mounting is where to look next.