1999-2004 hyroboost brake booster

[SilverGT]

Is anyone familiar with the brake boost system that works off the power steering?Last year I replaced one brake caliper but did not bleed all even though the brake fluid got quite low in the master cylinder.I wonder if this is why I have a hard pedal or if the hydroboost system is bad.Has anyone come across this problem?

 

[05 gt 5spd]

Air will give a soft / sponge like feel.
Here are couple things to check.

Does power steering feel normal ? Good power / easy to turn wheels ?
If yes pump is likely ok.
Loose belts / weak tensioner can limit steering pressure that is also used for braking boost.

Step 2 Turn off car - pump brake until hard - keep foot on pedal ( pushing ) and start the car. The brake pedal should drop then push back on your foot as the booster does it’s job.

 

[SilverGT]

Tried step 2 last fall and it did kick back.I never thought of checking the power steering belt tensioner.The steering is a litte stiff.I will check it first before doing anything else.Thanks for the tip.