Why Your Subaru Shakes When Braking: Rotors, Tires, Suspension or Something else?

When your Subaru shakes while braking, you may be assuming the rotors are going bad. While that’s often the problem, there are several other factors that could be at play.

         At Suba Rupair in the Denver neighborhood of Englewood CO, we see a lot of brake vibration issues that are caused by more than just pads and rotors. While rotors are the most common culprit, there are several components that play a role in keeping your vehicles braking experience smooth and responsive. The feeling of your cars braking can also be affected by tires, alignment, suspension, or even chassis problems.

What do the “brake shakes” feel like?

Its can be described a few ways:

·       Shaking in the steering wheel when slowing down

·       Pulses in the brake pedal under foot

·       Shuddering in the front of the car

·       A general rough/unstable feeling when coming to a stop

If this is happening to your Subaru, its time to take a closer look.

Below we’ll talk about the causes with the most common first.

Rotors

Rotors are metal discs that are part of a vehicles wheel assembly. The rotor’s job is to give the brake pads something to grab onto in order to slow the vehicle via friction.  What’s often known as a “warped” rotor is more so uneven wearing on the rotors surface where the brake pads made contact. Once this begins, it only gets worse over time as it creates a negative feedback loop where pressure is applied more and more unevenly to the rotors surface. With this uneven friction/pressure the vehicles braking will also begin to feel progressively more uneven/shaky.

How Suba Rupair addresses failing rotors

At Suba Rupair LLC we always opt to replace the rotors when they are failing instead of machining them(resurfacing).

Why? Because we want the repairs to last.

Machining and resurfacing rotors often works for a time but, in our experience, they have far less reliable longevity. So considering the labor involved in installation, we always prefer to install brand new rotors and avoid having the sporadic failures which we’ve seen occur in as little as 10k miles(Two oil changes later). 

other components on your Subaru that can contribute to rough braking/deceleration

Subaru inspection guidance also includes things like:

• tire condition

• tire pressure

• wheel alignment

• ball joints

• tie rods

• Suspension related wear items

That matters because your brakes only work as well as the rest of the car allows them to. If the tires are worn unevenly, the alignment is off, or front-end parts are loose, your Subaru may feel shaky or unstable under braking even if the pads still have life left.

Tires

Tires can make braking feel worse and can play a bigger role than people realize. If your tires are unevenly worn, underinflated, or just in poor shape, your Subaru may not feel planted when you slow down. Instead of a smooth stop, you may get vibration, pulling, or a general sense that the car does not feel right.

That is one reason why a good brake inspection should never stop at “you need pads.”

But what can cause tires to wear unevenly and independently impair braking/deceleration?

suspension:

Worn suspension or steering parts can also make braking feel worse. If parts in the front end are loose or worn out, the car may not stay as stable when weight shifts forward during braking. That can make the vibration feel more noticeable, and it can make the vehicle feel less controlled overall.  Suspension is also responsible for keeping your wheels aligned (bushings,control arms, tie rods etc) and evenly on the ground(struts and shocks). The more unstable your ride, the more the wheels will have uneven stress applied to them causing irregular wear. 

Struts

Struts can cause a dipping/diving sensation that prevents the vehicle from stopping properly and can also cause issues if braking through bumps, cracks, potholes ect 

So even though clients come in saying, “my brakes are shaking,” sometimes the real answer is bigger than the brake system itself.

Why this happens so often in Colorado:

For Subaru drivers in Englewood and the Denver Metro Area, there are a lot of things working against the braking system:

• Stop and go traffic

• Rough roads and potholes

• Winter weather

• Mountain driving

• Long downhill braking

All of that adds wear to the brakes, tires, and suspension over time which is why it is so important to look at the whole picture instead of just replacing the cheapest part and hoping the shake goes away.

And this is why diagnosis matters

If you're simply guessing, you can end up throwing money away without a resolution. 

For example:

• If the pads are replaced but bad rotors are ignored

• The rotors are replaced but worn tires or loose suspension parts are ignored you’ll get mixed results

How we look at brake vibration at Suba Rupair

When a Subaru comes in with braking vibration, we want to figure out why it is happening, not just sell the quickest possible brake job.

That may include looking at:

• Pad and rotor wear

• Tire condition

• Uneven wear patterns

• Alignment clues

• Steering and suspension looseness

• The overall stability of the vehicle when braking

Our goal is to solve the problem in a way that makes the car feel solid and dependable again.

The bottom line

If your Subaru shakes when braking, the cause could be:

• Worn rotors

• Brake surface problems

• Tire issues

• Alignment problems

• Worn suspension or steering parts

• Or a mix of several things at once

The important thing is not to simply assume it is only one part.

If you are in Englewood or anywhere in the Denver Metro Area, bring your Subaru to Suba Rupair for a proper brake inspection. We can help you figure out what is causing the shaking and what it will take to make your Subaru feel smooth and to have confidence in its safety.

FAQ

Why does my Subaru shake when braking?

The most common cause is rotor-related brake vibration, but tires, alignment, and worn suspension parts can also make the problem worse.

Does brake shaking always mean bad rotors?

No. Rotors are common, but they are not the only possible cause.

Do you machine Subaru rotors?

At Suba Rupair, we usually prefer to replace rotors instead of machining them because we believe it gives customers a more dependable long term result and less time in the repair shop.

Can bad suspension parts affect braking?

Yes. Worn front end parts can make the car feel less stable under braking and can add to vibration or rough brake feel.