I'm replacing the brake rotors and pads on my 2012 Toyota Rav4 (V4 engine) and as I'm doing the rear wheels, I noticed that as I was pushing back the brake caliper piston that it quite a bit of air inside it (in the rubber seal). Is this normal? The other wheels did not have kind of air inside it and there was no protrusion; the piston black rubber seal and piston metal tube was perfectly flush with one another.

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    Have you pushed the pistons too far back? Do they need to go back so far? – Solar Mike Mar 30 '19 at 17:48
  • @SolarMike I put an old brake pad in front of the piston and pushed it back as far as it can go with the piston compressor hand tool. I did it with all my other wheels as well, in order to get the caliper frame to fit back into the caliper bracket. – Joesph Mar 30 '19 at 20:40
  • I only push the piston back as far as it needs to go - and also I remove any crud of the edge of the rotor to help with that... – Solar Mike Mar 31 '19 at 1:42

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