I was performing my annual pre-season brake isnpection, bad swap, brake bleed and ran into a problem retracting a set of pistons on my Wilwood BSL4 calipers. The passenger side went smooth, but I am not able to compress the inner, driver's side set of pistons into the caliper. I've removed the old pad and installed the wear spacer in its place, and use a c-clamp to compress the pistons. Any advice...

 

loosen the bleed screw then compress it.. Let some of that pressure out.. Might want to rebleed the brakes tho. Also when you bled the brakes i hope you had the calipers still installed on the truck with brake pads in...

 

I wouldn't try to force it back in, pop it out first and inspect. Just step on the brake peddle to force out.

Yes it will make a mess, but better than ruining a caliper.

 

I planned on rebleeding the entire system w/ new fluid and had the bleed valve open. I think I'll remove the caliper and play it safe.