Originally Posted by jluu6r

This was my 1st brake job i've ever done. I replaced my rotors and pads. Didn't open the bleeder valve and compressed the caliper piston while making sure the master cylinder didn't over flow, I did have to remove some brake fluid.

I started my truck up and press the brakes and it's feeling mushy. So I check for leaks and bleed my brakes. No Leaks and bleeding the brakes didn't help. I did notice a hissing sound near my brake pedal, I think I messed up my brake booster which was just replaced a couple of years ago.

Could compressing the calipers without opening the bleeder valve mess up my brake booster? not sure what I did wrong.