What causes brakes to do this?

[Bernoff]

My Mazda cars rear brakes are like this. Is it because too hard of brake pads, not using the E brake when parked, thanks for advice.

 

[northern bear]

Guessing the sliding pins are seized. Not allowing force to be applied to both pads equally. Betting the inside one is worn out considerably more.

 

[Frankenytro]

I agree with northern bear. Pull them apart and likely find that you need a whole brake job. Big tip would be to make sure you clean and lube the slide pins with silicone lube when reassembling. Clean frames and abutment clips with clean and well lubed slide pins make for a happy disk brake system.

 

[firstdoo]

Bernie, that's from only using the gas pedal. hahahaha

 

[AreWeThereYet]

I am going to go out on a limb and say possible small wheel hub runout. Is the brake disc shiny on the top inner side like it is on the bottom outer side? Sticking slider pins will usually cause excessive wear to the inner pad over the outer,.. or vice versa,.. I can't remember

 

[Bernoff]

Thanks Guys I haven't taken anything apart yet. Appreciate the Advice though.

 

[seen46]

See this all the time. Basically on most cars, the rear brakes provide minimal braking contribution during normal driving. So, flakes of Rust from the rotor. Are breaking off and getting embedded in the pad and rotor surface, before they can burn off... You can try driving more aggressively, try a harder pad material, or a coated rotor to try to prevent the rust from forming as long a possible.

 

[tex78]

Yup, see it all the time

Coated new rotor will last the longest

Washing out wheels of salt makes a big difference too

 

[Bernoff]

Can a guy use that copper antiseize instead of silicon lube? Yes i am NOT a really aggressive driver. LOL.

 

[CatMan16]

Can a guy use that copper antiseize instead of silicon lube? Yes i am NOT a really aggressive driver. LOL.

Don't recommend that copper coat gets sticky when it is cold. Will cause other issues.

 

[DaveB]

Don't recommend that copper coat gets sticky when it is cold. Will cause other issues.

What about old school Nev’r Seize....zinc I think....? I tend to use that chit like Frank’s Red Hot....

 

[ABMax24]

What about old school Nev’r Seize....zinc I think....? I tend to use that chit like Frank’s Red Hot....

Bostik Nevr Seize is copper and graphite based.

Anti-seize really isn't designed for constantly moving parts like slider pins. It hardens up over time, it works well on threads because it forms a layer between the threads making eventually removal easier.

Regular bearing grease would probably be a better idea. Personally I just use the silicon pin grease, but I don't screw around with brakes, if there's one system on a vehicle I always want to work that's it.