Abnormal Brake Wear, What to bleed Options

[airforceb2cc]

I changed my pads a few years ago and I just started hearing the wear sensor squeel. I only drive about 5000mi a year so I took the tire off to see what was up. Only one pad is worn down and the rest are still new. My question is, do I just need to bleed the brakes or is there more that I'm not seeing here? If I just need to bleed, do I bleed the three that aren't stopping or the one that is?

Thanks,

Don

[GriffGirl]

I think it sounds unlikely that you'd have air in three of the brake lines and not all four. Just seems odd. But anything is possible I guess; try bleeding all the lines and see if there's any improvement.

Is it a rear brake that's squealing? I'm wondering if the brakes are out of adjustment? This is just based on my past experience with brakes, but on other cars, not on a Celica. Worth looking into I think though.