Extremely fast and uneven rear brake pad wear - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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Old 03-25-2010, 12:18 PM   #1 (permalink)
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Default Extremely fast and uneven rear brake pad wear

Ok guys, here's another one. I had to change out my rear brake pads because it wasn't passing state inspection. I was very surprise as I put them on the same time as my front brake pads (Hawks HPS). When I went to take them out, I noticed that the calipers didn't slide out but had to be pushed off with some good amount of force. When I examined my pads, the drive rear was down to about 4mm while the passenger rear was down to about 2mm. I'm completely surprised. I checked out my front pads and they have plenty of life on it (didn't take it off to measure but definitely visible). I've only had the pads on for about 10k miles too. I have a feeling that the rear calipers were stuck or didn't have much movement at all.

What could be the cause of this? Air in the system? Caliper going bad? When I depress down on my brake pedal, it feels a bit spongy but it still stops me on easily if I need to. How can I go about diagnosing this, besides taking it to a shop?
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Old 03-26-2010, 01:17 PM   #2 (permalink)
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you galiper is seized, I have the same issue
you can try to simply sand blast some of the pieces but best would be to rebuild them
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Old 03-26-2010, 10:45 PM   #3 (permalink)
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Just take a file to the slide points, and also buy a hardware kit with new tabs where the sliding takes place. Those, combined with brake hardware lube and you'll be fine.
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Old 03-26-2010, 11:20 PM   #4 (permalink)
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Quote:
Originally Posted by karlt10 View Post
Just take a file to the slide points, and also buy a hardware kit with new tabs where the sliding takes place. Those, combined with brake hardware lube and you'll be fine.
This. Sounds like guide pins. Rock Auto carries them, but I bought them from Carquest.
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Old 03-27-2010, 12:32 AM   #5 (permalink)
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whoa, thanks for replying but you got me at caliper, then lost me. =D

My knowledge of the braking system is...umm close to minimal except for knowing how to change the pads and bleeding the fluids. Ok, going to do some reading...

Ok, just read up what a seized caliper is. I can imagine that a seized caliper would cause the accelerated wear, however I never saw, smelled, heard, or felt anything funny with the rear brakes. On second thought, there were a few times in which I heard what sounds like something dragging on metal when slowing down (this was with the windows down).

Wow, rebuilding the caliper seems a bit time consuming. With a baby coming ...umm any day now...I won't have time to work on it for a while. Might have to look for a used caliper then.

I do remember when I installed the rear brake pads, I applied a nice and even amount of brake quiet to the pads. Could that material have gotten into or around the piston and seized it? Thanks for the inputs fellows.
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Old 03-27-2010, 08:51 AM   #6 (permalink)
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I'd bet things are simply rusty and causing the drag.

I would think the odds of your piston actually being seized is pretty damned low. If the car had been setting unused for 12 years, maybe. My brother has an '88 Buick with about 16k miles and lives in the garage. Last summer he took the braking system apart. Both front calipers were full of rusty fluid, and naturally the seals hadn't seen regular use either. Neither piston was seized.

As for the guide pins, I've only seen one that ever needed replaced; it was broken. Just clean the old ones with a ScotchBrite pad or emery cloth, re-lube them and reinstall.

As for hardware (tab) kids, Rock auto has them for dirt cheap. When I saw that ours uses those pseudo-chrome plated tabs, I ordered new ones before doing my brakes. Those things are always rusted. I used the new tabs, wire-brushed and/or filed anywhere the metal meets or comes close to meeting- then used brake lube on any contact/movement point.
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Old 03-28-2010, 12:50 PM   #7 (permalink)
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I'm about to rip one of my right rear caliper out this afternoon on my MS6. I changed the pads at about 40,000 miles when wear was extremely uneven with pass. side worn down to metal.
Since the dealership had pointed the need for rear pads out to me, I asked why would the rear pads be wearing so fast if there was not a problem with the calipers. "Oh no problems just worn pads" The front pads had at least 50% of life left on them!

When I changed the rear pads the calipers were not seized, so I really paid attention to changing the tabs and cleaning the pins.

It didn't seem to work I heard the tabs hitting last week. Then the right rear stunk after a long drive on top of making noise. I bought a rebuilt caliper from Autozone which should finally resolve the issue. ( I didn't want to spend time rebuilding the caliper myself)

This seems to be a common problem with these cars.
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Old 03-29-2010, 01:44 PM   #8 (permalink)
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Thanks for the inputs. I'll see how my rear pads wear and check them in another few months. My commute to and from work is only 15 miles so I won't likely see much of a difference until a few months down.
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Old 04-02-2010, 08:07 AM   #9 (permalink)
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just recently was doing brakes and one of the calipers would basically lock up after installation. It had to much grease in the bores and was hydro-locking. Brake cleaner + cotton swabs did the trick. Get rid off all the grease from the bores and pins, clean them out with brake cleaner and relube them using little grease and see if that helps.
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Old 04-02-2010, 09:25 AM   #10 (permalink)
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recommend using high temp moly based grease on those slides after you clean them up!
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