48 votes
Accepted

Dealership says European cars need rotors replaced with every pad change because they use softer metals in rotors

You are right to be skeptical, the 'softer metals in european rotors' is complete horsedung. A bit of rust is completely normal, the rest of your criteria for replacing rotors is right on the money, ...
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  • 14.5k
31 votes

Do I need to replace my rotors?

While I cannot see the back rotors very well, I can tell you without a doubt, the front rotors are brand new. You can still see the crosshatching on the surface which means it was prepped. It doesn't ...
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16 votes

What can cause perfect holes in brake rotors?

These are stomata (gas bubbles) in the cast iron or cast steel of your brake rotors. Stomata are usually perfectly round, but may be teardrop-shaped. They are sometimes not visible in the original ...
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  • 1,108
12 votes
Accepted

Can I fit thinner disc brakes to my car?

You have ordered the incorrect discs, or the supplier has made an error. You will need the correct vented, thicker, disc as the caliper has a « jaw » sufficiently large for the combined thickness of ...
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  • 34.4k
11 votes

What causes brakes to pulsate right after rotor and pad replacement?

I've done countless brake jobs at the shop I worked at; without hearing/seeing the car here are some things that can cause noise/pulsating: Non-burnished brakes - like others have stated after ...
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  • 428
11 votes
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Replace driver side first, then passenger side brakes?

I'm going to assume you have a very good reason for not taking the other car out of the garage to give yourself more room... People replace either the front or rear brakes together because they are "...
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  • 13.2k
11 votes
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Is grinding the "ear" of a disc brake pad ok to make it fit?

This is acceptable practice. Low quality brake pad backing plate edges can be very rough and the dimensions are often off spec. Higher quality pads usually have a better formed edge that fits ...
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  • 11.5k
10 votes

What causes brakes to pulsate right after rotor and pad replacement?

The Myth (Or, how to blame customers for bad brake jobs, since the problems usually take a while to show up) What is passed off as a "warped rotor", and blamed on the user running through a puddle ...
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  • 2,139
10 votes

Rotor Replaced and MY Car is only 3 years old

The only way to know if a rotor needs to be replaced is measuring it with a micrometer and comparing that to the manufacturers specifications, so, no, we can't tell you if it needed to be replaced. ...
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  • 13.2k
10 votes

What do you do when brand new pads are rubbing on new rotor? It smokes and smells so bad and it seems like it is going to catch on fire

It does sound like the caliper is not releasing, which means it is bad, or at least needs some repair. You might have corrosion on the slides, or the caliper pistons. The caliper needs to be replaced ...
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  • 14.5k
9 votes

When do brake rotors really need to be replaced?

The direct answer is that you have to replace your rotors when they look like this:
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9 votes

When do brake rotors really need to be replaced?

It's pretty obvious from reading all these replies, that the mechanic shops want you to always replace your rotors, and pay them to do it. Rust on the edges is normal and will happen with new rotors ...
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  • 121
9 votes
Accepted

What grade of bolts should I use for motorcycle brake hardware?

No, A2 bolt is not safe. You can use the calculator here: http://www.tribology-abc.com/calculators/e3_6b.htm ...for bolts of grade 8.8 and M8 thread. It will say that the maximum tightening torque is ...
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  • 13.5k
9 votes

Is a rubbing disc brake dust cover the first symptom of a bad wheel bearing?

Your understanding of how it's connected together makes sense, however, if you are rubbing a brake dust cover (backing plate) it doesn't mean the bearing is going bad. The first thing I'd be looking ...
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9 votes

Dealership says European cars need rotors replaced with every pad change because they use softer metals in rotors

No, rotors can go through 2 or 3 sets of pads. But if a stone or piece of grit causes scoring then they need replacing. Sometimes resurfacing is sufficient but often the time needed is more than ...
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  • 34.4k
9 votes

If my brakes are making a metal on metal noise, it is pretty much guaranteed I should replace my rotors along with my brake pads?

Squeaky brakes are often the wear sensor, when the pads get low on material they're designed to squeal so you know they need attention. So, you'll almost certainly need pads. As to whether you need to ...
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  • 14.5k
8 votes

When do brake rotors really need to be replaced?

This is a great question, so let me help. First, I am the owner an auto repair center in New Hampshire and rusted brake rotors are almost an everyday occurrence here. If you live in an area that uses ...
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8 votes

What causes brakes to pulsate right after rotor and pad replacement?

More than likely you didn't bed your brakes correctly. If you read this from Centric Parts, you find out exactly what I'm talking about. The specific part I'm talking about is the portion on an even ...
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8 votes
Accepted

How much disc brake drag is acceptable?

What is a freely spinning wheel? Of course, you should be able to spin the wheel by hand, but beneath the brake, bearing and transmission can apply lots of drag. My rear wheels do about 1.5 to 2 turns,...
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  • 6,997
8 votes

Do I need to replace my rotors?

There's nothing wrong with your rotors as far as can be seen from your pictures, it's totally normal to have the edges rusty, it doesn't impair them. What's important is that the disk surfaces are in ...
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  • 14.5k
8 votes

What can cause perfect holes in brake rotors?

It looks like the car sat for awhile in the past and the (worn) pads developed rust. The rusting rivets on the pads probably ate those holes into the rotor. Look at all the other rotor surfaces. Brake ...
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7 votes
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What causes brakes to pulsate right after rotor and pad replacement?

Paul, I'd like you to open up those brakes again and examine the rotors very carefully. I just finished a conversation with a fella who described symptoms identical to yours. I walked him through a ...
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  • 2,534
7 votes

Rotor Replaced and MY Car is only 3 years old

You cannot tell from just looking at them (in most cases) ... you have to measure the thickness of the rotor to see if they need replaced. Also, it's hard to tell from the picture how deep the wear is ...
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7 votes
Accepted

What are the visual signs that brake rotors must be replaced?

Overheated rotors can show some tell-tale signs. Once the metal has been overheated, it can weaken or warp which are both bad things. Some signs: Bluing Cracks These "spider cracks", "heat cracks"...
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  • 13.2k
7 votes
Accepted

What type of Brake Lube to use

Two lubes are needed to properly lubricate caliper type brakes. Silicone is used on the slider pins and anything that touches rubber. A generous amount that completely coats the pin, hole wall and ...
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  • 11.5k
6 votes
Accepted

What is causing this terrible grinding/groaning noise when I come to a slow stop sometimes? (but not always!)

Well, the new rotors and pads were the answer. I'm surprised that the EBC OEM replacements gave me so much trouble, but the new EBC Red Stuff (ceramic) pads and slotted rotors have been wonderful. ...
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  • 381
6 votes

Remaining life expectancy of brake pads and rotors

Paulster2 offers sound advice when he says the pads need to be replaced sooner rather than later. I recently took a picture when I performed a brake pad swap that offers a stark comparison of what ...
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  • 39k
6 votes

Remaining life expectancy of brake pads and rotors

2mm of friction material is not much. I would suggest you change the pads as they have. They may last a bit longer, but at what point are they going to go metal-on-metal and greatly reduce your ...
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6 votes

Disk rotors wear

Unless the rotor shows obvious signs of damage there is no way to tell by a photo. The only way to be sure is to measure the rotor with a micrometer. The most accurate method is with a micrometer ...
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  • 19.7k
6 votes
Accepted

would turning the rotors make my front end go out of alignment?

It is not normal for the front end to go out of alignment when getting the front rotors turned, but it would not be unheard of. Any time you mess with the front end of the vehicle you run the risk of ...
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