I didn't need to replace the sensor when I did my rear brake pads, as the pads weren't worn out (some of the pad material had detached from the backing plate), no issues so far.
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Correct, however the plastic can become somewhat brittle and you can break them if you're not careful when you pull them out.If what I read is correct, the sensors won't need to be replaced since the indicator light in the dash isn't on.
For compressing the caliper piston(s), in the past I have used a C-Clamp with the old brake pad and compressed the piston that way. I see at FCP Euro they have tools that are caliper specific to compress the piston(s) but are like $100 for a name brand. Would an old school C-Clamp and an old brake pad work for the front and rear calipers?
I have a special tool that I got for my VW where the parking brake is integrated into the rear caliper and requires the piston to be rotated while retracting - impossible to do with a C-clamp. Just be careful retracting the piston and keep an eye on brake fluid reservoir fill level - you don't want to overflow. I often put a bleed hose and crack the bleeder screw while pushing the piston back.I used a c-clamp and a piece of angle iron I had laying around