I read conflicting answers regarding the need to loosen the bleeder on the caliper before pushing the piston back because of ABS issues. I'm sure there is an owner out there who works at or has worked at a dealer who can give me and other owners a definitive answer. The Chilton book does not mention opening the bleeder. It shows the traditional method. I have a
2009 LT1. It's my first and I love this car. I can't thank you all enough.

 

Never heard anything about cracking the bleeders. My panel does not have ABS but I have done brakes on many cars that have and I have never had an issue with pushing the pistons back in without cracking the bleeders. Not sure how it would be bad for the ABS unit. I am no certified mechanic so I could be wrong. Just never had an issue.

The only issue I did encounter was having to drain some of the fluid from reservoir so it did not overflow. Folks adding fluid as the pads wear makes for an overflow situation when pistons are pushed back.

 

Welcome-

The whole proceedure is based on calipers containing the dirtiest brake fluid. Cracking the bleeder when compressing the piston prevents pushing dirty fluid back up into the ABS.

Whether you do it or not, the world won't end tomorrow..

Mine has ABS, & that is the only way I would compress the piston, then later topping up the master with new Dot-3 brake fluid.

 

If you thought you read conflicting opinions before you posted........Where you intending to Stir the Pot?

My advice is: choose one for yourself. Everyone's got one!

Most brake "experts" recommend that the fluid be flushed at some interval. Changing a few ounces every once in a while makes some people feel like they have accomplished something. No judgement intended.