new brake discs?

[qwertyjjj]

It is difficult to see the wear at the edge of the rotor but not sure it's that bad. How much wear could they get before needing to be replaced, just 3mm wear or is it much more?
The pads look plenty at the back.
The front, well, less but not sure it's down to 3mm yet. The edge I took the picture of is the leading edge so should be more worn than the rest?
Any thoughts?

FRONT

BACK

[oragex]

The rear discs seem really tired while the pads are still very good. If replacing the rear rotors, it would be wise to closely inspect/replace the handbrake shoes that sit inside the rotor, they tend to delaminate and cause damage.

Front discs seem decent, while the pads are a bit worn but personally I wouldn't change them yet, they may still be good for quite a few thousand miles.

[qwertyjjj]

The rear discs seem really tired while the pads are still very good. If replacing the rear rotors, it would be wise to closely inspect/replace the handbrake shoes that sit inside the rotor, they tend to delaminate and cause damage.

Front discs seem decent, while the pads are a bit worn but personally I wouldn't change them yet, they may still be good for quite a few thousand miles.

What is the thickness of the calipers vs the pads that you can see in the shot so I can estimate width of the pads left? ie if claiper is 0.5 cm thick then pad would be 0.4 or less.
What is it on the rear rotor that makes them look tired in case I can get a better photo t be sure?

[oragex]

Front pads seem to be around 4mm remaining, I would replace at 2mm given the wear is uniform. This is the material that is contacting the disc surface, it's the wear material of the pads, same that on the rear wheels pads is ticker on your car.
Rear discs seem to have uneven wear across the surface and the outer edge seems very rusted sign of age

[qwertyjjj]

Front pads seem to be around 4mm remaining, I would replace at 2mm given the wear is uniform. This is the material that is contacting the disc surface, it's the wear material of the pads, same that on the rear wheels pads is ticker on your car.
Rear discs seem to have uneven wear across the surface and the outer edge seems very rusted sign of age

I meant how can I tell that exact thickness left? I can only compare to the thickness of the caliper but I don`t know what the thickness of the caliper is.

Is it necessary to replace the rotors at front if just the pads are replaced? Or can you just put new pads on?
Given the back, I should just drive it until the pads wear thin then replace the back pads & rotors together but not yet maybe in another 2 years?

[nsjames]

watch that.

[qwertyjjj]

watch that.

You have to take the wheel off to do that
I was trying to see if there is a known caliper width for the v70 to eye estimate how much pad was left

[abscate]

You can't evaluate brakes like that safely. On an old car, you never know if the parts are OEM, and replacements can easily have different specs.

You should be able to peer in with a flashlight and see the brake pad and friction surface to evaluate without pulling the wheel.

Rough rule - if the friction material is as wide as the metal back plate, you are ok, if thinner, its time to order parts.

[oragex]

Front pads seem to be around 4mm remaining, I would replace at 2mm given the wear is uniform. This is the material that is contacting the disc surface, it's the wear material of the pads, same that on the rear wheels pads is ticker on your car.
Rear discs seem to have uneven wear across the surface and the outer edge seems very rusted sign of age

I meant how can I tell that exact thickness left? I can only compare to the thickness of the caliper but I don`t know what the thickness of the caliper is.

Is it necessary to replace the rotors at front if just the pads are replaced? Or can you just put new pads on?
Given the back, I should just drive it until the pads wear thin then replace the back pads & rotors together but not yet maybe in another 2 years?

The brake pad has two parts: one thick plate of metal that doesn't wear, on top of the pad can be seen on pictures facing the camera, and a second wear material part that sits on the brake disc surface.

Using a plastic rule, try measuring the thickness of the metal plate (the one that faces the camera) of the pad. This will give an indication about how much wear material is remaining. On my pads, this metal plate is 5mm thick. If yours is the same, then your front pads wear material must be around 2mm thick so it's about time to replace it. If your metal plate is thicker, say 7-8mm, there might be enough wear material remaining.

My personal opinion which differs than many other owners/mechanics point of view, is a good brake disc does not need replaced only because new pads are installed. I expect a brake disc to outlast 2 or 3 sets of brake pads. The discs normally wear much slower than the brake pad wear material.
Same goes when replacing the discs, while keeping an old but still good set of brake pads. I see not problem with this either.

[qwertyjjj]

Front pads seem to be around 4mm remaining, I would replace at 2mm given the wear is uniform. This is the material that is contacting the disc surface, it's the wear material of the pads, same that on the rear wheels pads is ticker on your car.
Rear discs seem to have uneven wear across the surface and the outer edge seems very rusted sign of age

I meant how can I tell that exact thickness left? I can only compare to the thickness of the caliper but I don`t know what the thickness of the caliper is.

Is it necessary to replace the rotors at front if just the pads are replaced? Or can you just put new pads on?
Given the back, I should just drive it until the pads wear thin then replace the back pads & rotors together but not yet maybe in another 2 years?

The brake pad has two parts: one thick plate of metal that doesn't wear, on top of the pad can be seen on pictures facing the camera, and a second wear material part that sits on the brake disc surface.

Using a plastic rule, try measuring the thickness of the metal plate (the one that faces the camera) of the pad. This will give an indication about how much wear material is remaining. On my pads, this metal plate is 5mm thick. If yours is the same, then your front pads wear material must be around 2mm thick so it's about time to replace it. If your metal plate is thicker, say 7-8mm, there might be enough wear material remaining.

My personal opinion which differs than many other owners/mechanics point of view, is a good brake disc does not need replaced only because new pads are installed. I expect a brake disc to outlast 2 or 3 sets of brake pads. The discs normally wear much slower than the brake pad wear material.
Same goes when replacing the discs, while keeping an old but still good set of brake pads. I see not problem with this either.

Must a rotor always be resurfaced when a set of new pads is put on or can you just replace the pads and go?
Guess the question is how much does a resurface cost? Think most garages just find it easier to charge for the new rotor given there shouldn't be any problems.
I'm assuming for my back rotors, I can just wait until the pad is worn and then change both out - no need to do it now.