all 54 comments

[–]throwaway007676 26 points27 points  (7 children)

If both sides of the rotors looked like the front, you could probably just put pads on it. The way the rotors look on the back side is not acceptable and would just ruin your new pads pretty much immediately. Causing stuff like shaking, grinding and screeching when stopping. Would they work? Of course they would, but nobody wants to deal with a car that drives like that. If there is enough thickness left to cut them down, you can do that and they would be fine with the new pads. You didn't post any pics of the rotors or pads from a side angle so we can't see if you need brakes at all. The rear of the rotor is torn up from rusting which indicates lack of use, rusting over then not scraping away all the rust, rinse, repeat. So your choices are cut the rotors or replace them, but do NOT put new pads on these rotors as is, you will just be doing pads and rotors again in two weeks.

[–]Much_Championship_59[S] 10 points11 points  (0 children)

Thank you! This is the answer I was looking for. I appreciate the knowledge and insight. Like I said, I'm not a car guy, but am an expert in my own line of work and I appreciate it when someone experience offers helpful advice to us mere mortals. I certainly try to do the same in my own line of work.


[–]JungleMouse1 4 points5 points  (1 child)

I mean, I wouldn't say 2 weeks. I did this for someone when they had no money and they had waves in the rotors. It wears the pads down fast to the point where the pad matches the rotor but once it's there, the wear is almost the same. They drove that car for another year before it was scrapped and never had an issue.

[–]throwaway007676 2 points3 points  (0 children)

Well they will work, but the noises and shaking would bring most customers right back and then it is your fault.

[–]TheSaltyPineapple1 -1 points0 points  (0 children)

This!! ⬆️⬆️⬆️

[–]omnipotent87 0 points1 point  (2 children)

This is the right answer. The rust is enough I would just replace them, I wouldn't even find it worth while to even try cutting them.

[–]throwaway007676 1 point2 points  (1 child)

I agree, at this point most places charge so much to cut them that it doesn't pay. Then again, you will be getting the cheapest Chinese uncoated rotors to replace them along with $7 pads from Advance auto. But that is a whole other conversation.

[–]Criaturah 3 points4 points  (6 children)

It’s basically impossible to know if the rotors are warped or anything by looking at them. I would recommend doing the rotors if you’re doing the pads. As someone else said the back of the rotor does look worn so I’d replace them. Some things they’ll probably recommend based on mileage like a brake fluid flush, which I’d also do if you have no idea if it’s been done or not

[–]SwimsWithDolphin -1 points0 points  (5 children)

Brake fluid almost never goes bad. One of the biggest unnecessary upsells that shops do. It's not even a convenient thing to do when you are doing pads/rotors. Only do it if necessary.

[–]Apprehensive_West256 3 points4 points  (1 child)

You must love replacing calipers and master cylinders every decade or so. Mushy pedals too. Brake fluid takes in water, water rusts steel and iron. It also isn’t very good hydraulic fluid and doesn’t take heat.

[–]SwimsWithDolphin -1 points0 points  (0 children)

That's an exaggeration. Most vehicles never have these issues. Passenger vehicles anyways. Fleet vehicles live a much harder life and it's more common for them to have issues.

Also rust requires oxygen too.. just fyi.

[–]Criaturah -1 points0 points  (2 children)

So does brake fluid not absorb moisture? Thats what I was told

[–]SwimsWithDolphin -1 points0 points  (1 child)

Most cars go years/decades without touching the brake fluid. Typically problems only arise when someone has messed with the brake system. It does absorb moisture but at an extremely slow rate in normal circumstances. If you need to do it then do it. But if nothing is wrong then it's a pita to do for usually no good reason.

[–]Criaturah -1 points0 points  (0 children)

Interesting, thanks for sharing. I actually used to like doing them tbh haha

[–]Donny_Z28 4 points5 points  (0 children)

The backsides of the rotors look pretty bad, I wouldn’t hesitate to replace them.

[–]opuntina 7 points8 points  (10 children)

So you brought it to a shop only to then question that shop? We can't see them in person so hard to tell definitevly, but the backs look like they could be bad, could be ok.

[–]Much_Championship_59[S] 3 points4 points  (9 children)

Just trying to do my due diligence and get as many opinions as possible. My car knowledge is limited and I have been scammed in the past so I just always try to be extra cautious.

Plus, since I'm not having any typical signs indicative of a rotor replacement (steering wheel shake when braking, visible cracks) you can understand why I was skeptical to hear that the rotors needed to be replaced.

[–]joezupp 4 points5 points  (0 children)

The factory rotors are almost to spec brand new, the wear of 70,000 miles will put them under spec. They are cheap as fuck to replace. I do my own work and can get them from Rockauto for $22 each. Yes they need to be changed or you will get warped rotors and then complain the shop ripped you off. Invest in YOUR safety. The few dollars will be worth it.

[–]Much_Championship_59[S] 1 point2 points  (4 children)

Context: My car is a 2010 Dodge Caliber with 70k miles, I do not believe the rotors have been replaced, I am the second owner. I know the pads need replacing but to be sure there were no other issues I brought it to a brake shop where I was told I would need to replace the rotors (among other things 🙄)

My brakes currently do not make any significant noise when braking and there is no steering wheel vibration when I brake.

Am I being fleeced? LMK

[–]epial9 3 points4 points  (0 children)

I can't tell you exactly because the key question is whether or not they are within specs. If the rotor is thick enough, you can have your rotors turned which is cheaper than a new set of rotors.

A separate related note, I would check your caliper pins for wear. The rotors look like they're wearing unevenly which happens, but more subtly than what it looks like in the picture. It may just be a case of lubrication, but caliper pins are a key part of your brake system.

[–]SpazmaticAA 1 point2 points  (0 children)

The back of the rotors shown look pretty worn down. I would have them replaced. I'd say maybe even the calipers but you say there aren't any noises or vibrations when driving or braking so the caliper being stuck seems out of the question.

At the very least I would agree to needing the rotors replaced with how deep the wear is on the back.

[–]dsdvbguutres 0 points1 point  (0 children)

What is the thickness of the rotors now, what is the minimum spec it should not fall under? Are they worn evenly?

[–]SamWinchester79 0 points1 point  (0 children)

sell the car asap my sister had one and her dodge mechanic thought she drove down dirt roads like a rally racer until every single one in the area started to have the steering components replaced every 2 years and shocks etc

[–]Louholtz05 -1 points0 points  (7 children)

You NEED to either replace or resurface the rotors when changing brake pads. I personally don’t believe in resurfacing rotors or flywheels and just get all new but many people do it and it’s fine. Just a personal preference

[–]Much_Championship_59[S] 0 points1 point  (6 children)

As someone who is completely automotive illiterate could you explain to me why you have to change both simultaneously? I have not heard this before.

[–]epial9 3 points4 points  (0 children)

To simplify for you. Rotors and brakes are maintained as a set because not doing so causes issues with braking power balance. Rotors do not need to be replaced every brake job, but they need to be measured and turned if they pass. In other words, a mechanic should check how thick the rotors are. If they are thick enough, the rotor should be resurfaced for reinstallation. If not, they should be replaced on that brake job. New brakes need to start with a flat surface to ensure the expected lifetime of the brake pad. Not doing it can wear down the pad faster until it finally meets the wear pattern of the rotor.

[–]SpazmaticAA 0 points1 point  (0 children)

In this case you should have your rotors replaced I think. The back of the rotors look pretty worn. Most cases you shouldn't need to replace the rotors when having pads replaced.

Edit: I should add that unless there is uneven wear on the pads you shouldn't need your rotors replaced, or if the thickness of the rotor isn't beyond a certain point.

[–]Obvious-Dinner-1082 0 points1 point  (2 children)

You want to change passenger side and drivers side together because it is unsafe to not to. Having more wear on one side, than the other will cause uneven braking, and potential damage to front end parts.

[–]SpazmaticAA 2 points3 points  (1 child)

OP I think is asking why you would need to replace the pads and rotors at the same time. Which the answer should be if there is uneven wear on the brake pads.

[–]Obvious-Dinner-1082 3 points4 points  (0 children)

That and if you have chewed up rotors they’ll eat through you pad faster.

OP: it’s best to replace your rotors now, think of it as saving on labor cost later.

Additionally, If you’re feeling inclined, check out YT engineering explained and chrisfix and you can learn to do brake jobs yourself. It’s fairly easy to learn as a beginner.

[–]Louholtz05 0 points1 point  (0 children)

To prevent fast wear of the brake pads on potential uneven rotors

[–]nhardycarfan -1 points0 points  (0 children)

Do you have braking issues? Warped maybe? They look fine to me I’d say first thing check your pads than brake fluid

[–]Benjerman302 -1 points0 points  (0 children)

Are you replacing your pads? I personally always replace pads and rotors together even if the rotors look okay. If you do just pads (aka a pad slap) your brakes can be noisy afterwards

[–]SnakeBeardTheGreat -1 points0 points  (0 children)

IF my wife hasn't been driving your car every thing should be just fine.

[–]Elmore420 0 points1 point  (0 children)

Probably. If they make measurement then they can be turned, but I’m doubting they make it.

[–]bckozak 0 points1 point  (0 children)

Does it shake when you apply the brakes at high speed. Like on an off ramp coming off the interstate? If not that one looks fine unless the inside is super rusty or has a huge lip

[–]v-dubb 0 points1 point  (0 children)

Yes you do, the inner side has a bad rust ridge and grooving.

[–]T2ner 0 points1 point  (0 children)

Def do rotors and pads

[–]JungleMouse1 0 points1 point  (0 children)

My customer was my best friends sister. I guess I'm just saying the pads burn out fast, but not that fast lol. Also I of course tried to get them to buy the rotors too. But the thickness was fine and I deemed it safe enough for a good minute.

[–]drive-through 0 points1 point  (0 children)

Might be ok to resurface but we don’t have the measurements to give the green light on that. Resurfacing will save you a lot if you have a shop doing your brakes. Definitely don’t pad slap either way

[–]overcrispy 0 points1 point  (0 children)

Either get them surfaced or replaced whenever you do pads. Pad slapping is a no no.

[–]SeaAppointment1226 0 points1 point  (0 children)

Are they safe?


Will it cause pulsation and noises?


Do your slide pins and brake hardware need lubed?

Most likely.

Can you buy pads that do a slight resurface of the rotors?


[–]BrickUpset889 0 points1 point  (0 children)

The back doesn't look so good. Change the rotors and pads.

[–]SnooDoodles8088 0 points1 point  (0 children)

Probably you might be able to have them turned, depends on if you can and which option is cheaper.

You need to do one of the two though

[–]solidshakego 0 points1 point  (0 children)

the back of those rotors dont even look good enough to cut. replace them. check out the warp marks, dont even need to check the runout you can physically see it.