How to tell if brake pads and rotors actually need replacing
Visual surface rust and pad thickness determine whether brakes require replacement, but superficial oxidation on rotors is often normal and doesn't always demand new parts. Confusing rust with structural wear can lead to replacing functional hardware prematurely or missing actual friction material degradation.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Asking online mechanics forums for visual inspections of photos
- 2replacing all engine mounts
- 3cutting out old rubber and filling mounts with rubber pieces or polyurethane adhesive
- 4Inspecting tread wear visually, driving with extra caution in bad weather conditions, purchasing tires from discounted retailers, and taking them to specialized tire shops for mounting.
- 5inspecting for trapped debris or pebbles
- 6continuing to drive if the grooves are minor
- 7driving them for another 10k miles or installing new brakes to learn the process and get a longer lifespan
- 8continuing to drive without replacement
- 9Asking a mechanic during an oil change
- 10Inspecting the belt visually for cracks or dry rotting
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Checked my serp belt a couple weeks ago and saw some dry rotting, I asked the mechanic during my oil change to look at it and he recommended replacing it, so I did. Was it the right call? Might be the original as I haven’t replaced it in 8 years of ownership and the car is 13 years old. There’s no harm replacing other than the $ but wasn’t sure if this belt was high risk to fail.”source ↗
“what causes grooves in 1 year old rotors? do I need to replace them?”source ↗
“I feel like the engine moves a around a bit more than it should.”source ↗
“I’ve had this car since nov 2023. It’s a 2024 nissan versa. Got it new. It’s currently at 50k miles and I’ve never changed the tires before on it. Is it time?”source ↗
“Could I still drive this for another 2-3 months before changing or do I need to change it asap?”source ↗
“Thoughts on these brake pads and rotors on this Prius? In my very uneducated opinion, the front rotors (top image) look like they have more superficial rust than the rear rotors (bottom image).”source ↗
“Should I replace front and rear brake pads, as well as front and rear rotors?”source ↗
“Are you able to tell me if the brake pads are fine? How long will they last?”source ↗
“New to car repair, I don't like the look of how glossy these are, but there seems to a decent bit of material left”source ↗
Where this came up
People with this problem also raised
- 7How to tell if car suspension bushings need to be replaced
- 4When should I preemptively replace a car battery?
- 6How to tell if a worn timing belt actually needs replacing
- 6Should I change my transmission fluid at 60k miles?
- 3Finding individual brake parts for an older car
- 3How to tell if a broken car part needs immediate repair