Just bought a 2008 LR3 and noticed the rear driver rotors has very large grooves. The passenger side is not as bad but I can feel it with my finger tips. What would cause this? The pads still have a lot of life left. Should I change them out? I bought the rotors and pads since they were cheap.

 

Not exceptional. Generally cheaper pads/rotors do this it seems. But even the type of pad used can cause this more or less than others. Cheap semi-metallics seem to have larger metal bits in the pads. A sticking caliper can sometimes cause this too by letting the pad gently drag along the rotor. After driving for a bit you can touch the hub part of the rotor and see if they match side to side temperature wise. If one is a lot hotter, you have a dragging issue.

 

Grit thrown up from the road can do this and as been said some metallic bits in the pad. Some places will skim them for you.

 

Caliper is not sticking at all. Safe to run? Or would you recommend replacing?

 

Check whether there is a lip at the outer edge of the disk. If so replace, if not then good for more miles

 

I dont see a reason to replace. Maybe to keep an eye on, but they are not really bad. I mean it would not bother me at all.

 

there was a little lip so I decided to swap them. I’m pretty sure previous owner swapped pads but not rotors. For $130 CDN for both rotors and pads and sensor it wasn’t too bad