I just replaced my front brakes as I was pushing the pistons back for both front ones I heard an unusual "squishing" noise.


I then noticed brake fluid leaking on the floor.


I pinpointed the location to the brake master cylinder. It appears to have been coming out from the top cover.


I pumped my brakes, I have no pressure loss.


What could be causing this. Was there previously air bubble inside the brake lines?


The previous owner had servicing completed at Walker Acura in Louisiana.


Additionally, I also noticed that all the brakes were improperly installed.

 

The brake fluid was topped off when they serviced it. It's normal. You should always check the brake fluid prior to pushing pistons back in.

If it's at the top, it means it was topped (usually to retain pedal feel) and thus you need to use a turkey baster or similar to remove some prior to servicing your brakes.

 

Newbie mistake. Always remove as much oil as you can with a turkey baster from master cylinder before pushing in piston. That or have somebody check the cylinder while you push to make sure it doesn't overflow.

I strongly recommend you get a non corrosive multipurpose degreaser and clean everything next to master cylinder as brake fluid will eat through metal and other unprotected parts

 

Even better is to open the bleeder nipple on the caliper and attach a piece of tubing to it and put other end in a jar. Then when you push the piston back you do not force any fluid back thought the system. You will need to bleed after you complete your work but that's pretty standard. IMO pushing old fluid back through the system isn't a good thing to do.