Take the 2-minute tour ×
Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. It's 100% free, no registration required.

While changing the pads for my rear breaks (disk), I saw that while the external pads were all gone, the internal ones were at 1/3 to 1/2 only.

Is this normal? Should I address this? What is the cause - for self educational purposes?

share|improve this question

2 Answers 2

up vote 5 down vote accepted

They are supposed to wear evenly. The most common cause that I've seen of uneven wear is the caliper slides sticking. Often, the slide bolt boots don't seal real well, allowing water to get in and wash the grease out. Once that happens, they start to stick, causing uneven brake wear. In my experience, it can also be a problem if the car spends a lot of time sitting (even if the boots appear to be OK).

share|improve this answer

Check your alignment. If the car has ever been hit hard, the car might be driving down the road "sideways", that is that the back tires are not pointed straight. That will lead to uneven tire wear, uneven rear brake wear, handling issues, among others.

share|improve this answer
    
If the bearings and calipers are all in good shape, you shouldn't see any brake wear from improper alignment. It should all show up in the tire. However, with worn bearings you may see some brake wear issues. –  Brian Knoblauch Mar 22 '12 at 18:49
1  
That is an interesting point. I would imagine that the torque of driving out of alignment could damage the bearing. That in turn may cause the uneven pad wear. –  dotancohen Mar 22 '12 at 19:11

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.