I did some research and believed that one of my rotor is glazed. Right now the whole rotor ( rear passenger ) is covered by substance that looks like rust. I can occasionally hear dragging noise from the passenger side when I drive and when I let go of the brake pedal. My question is what is causing the glaze? And how do I resolve this issue without replacing the rotor and the pad. The rotors are brembo blank replaced 5 years ago and the pads are 3 years old. I need some feedbacks please.

 

You might have a frozen caliper

 

the caliper is frozen.. glazing is when they have a mirror like surface.. check the slide pins if they are lubed its a caliper

 

+1 on what f550 and Kevlo said

 

When the caliber is frozen, does it mean that the brake pad is making contact with the rotor all the time?

 

Not necessarily. It may not be opening all the way. Jack up one of the rear wheels and spin freely by hand and listen for any contact being made with the rotor.

 

depends on the last position of the caliper before it finally rusted. It could've rusted while it was wide open so no contact is made at all or while its shut, meaning you'll smell brake pads in the air and you'll notice some drag as well as poor MPG

 

I jacked the wheel up and it spun freely without any noise.

 

Your pins are rusted "open" dis-allowing contact between rotor and pad, and allowing rust to build up on the outer surface of the rotor. Your inner pad is likely still making contact and producing SOME work.

 

I'm going to take a look and maybe lube it up. If it fails, can I just buy the pins or I need to replace the whole caliper plus the bracket?

 

Rust and glaze are 2 opposites. Rust, which is dull looking, red and fuzzy, happens when the metal it not being rubbed by the brake pad. Glaze is very shiny and happens when the brake pad rubs the rotor so hard and long that the rotor gets extremely hot (overheated) which may make the rotor a bluish color.

 

ok, my rotor is definetly coated with rust.

 

You may be able to clean thaem and then lube. Try rolling sand paper up and sticknig in the bore, beyond that maybe a gun bore brush .38 or 9mm oughtta be close, maybe a lil big.

 

I think my rears may be frozen are they supposed to spin completely freely because I'm able to spin them but then they stop and they are hard to get past a certain point on the rotor it seems then they spin easily if I turn them past that point

 

Your rotor is warped, causing the brakes to be tighter in one spot, The fronts can do the same thing as well as be un-parallel. A sticking caliper would compound the problem, but is not the primary concern in your case.

 

wouldn't he have a pulsation in the pedal if the rotors were warped?

 

No pulsation plus rotors are not even a year old and they are cross drilled if that makes a difference

 

The rotors can be a little bit warped and not cause any problems. Spinning the wheel by hand is not an easy way to tell if you have a problem. On many cars the wheel does not spin freely and always stops in one spot. Driving and stopping will tell you more.

 

if there is ANY rust in the pad contact area of the rotor, you have a warped rotor. A rotor that is being used and isn't warped will always be shiny.

If the wheel cathes slightly in one spot, it is not a cause for alarm, but a strong catch + rust on the contact area of the rotor = warpage.