[firestorm]

Hey guys, both of my rear brakes pads are wearing irregularly. One corner of the pad is wearing very fast and the whole wear is cut at an angle. Both of the back brakes are acting the same. Are my caliper pistons sticking or something? If so how can I fix it. Thanks.

 

[paulo57509]

Most likely the calipers aren't sliding freely in their mounts.

Remove the calipers, brush off any corrosion on the sliding surfaces, apply a SMALL amount of silicone grease on said surfaces. Inspect the rotors, replace the pads and re-install the calipers.

 

[Rick90Legend]

Also, spray brake cleaner all over the brake parts. That stuff is amazing and messy - do over some newspaper.

 

[firestorm]

I didn't know that calipers moved or "slid." Thanks though. Which surfaces slide that i have to make sure they are lubricated and working right? I thought the only moving part was the caliper piston. Thanks again.

 

[paulo57509]

I didn't know that calipers moved or "slid." Thanks though. Which surfaces slide that i have to make sure they are lubricated and working right? I thought the only moving part was the caliper piston. Thanks again.

Single piston calipers have to slide in order to effect braking action.

When you push on the brake pedal, the piston and the pad on that side of the caliper (inboard pad) contacts one side of the rotor. As this pad contacts the rotor, it exerts presure on the rotor and causes the caliper "slide" towards the middle of the car so that the outboard pad can contact the rotor. This squeezing action on the rotor stops the car.

Now, take a look at the caliper and its mount. You should be able to identify where these sliding surfaces are. They'll be towrds the top and bottom portion of the caliper.