Sounds like you have a leaking brake booster. The booster is what supplies the power assist to the brake pedal and is located in between the firewall and the brake mater cylinder.
Eventually it will get bad enough to cause either the check engine light to come on for lean codes or cause the engine to start to idle poorly and possibly affect you ability to apply the brakes.
This is a relatively simple repair. You can remove the master cylinder from the booster. Leave the brake lines attached. Most of the time you can gently move the master cylinder out of the way and the lines will bend or flex with the movement. You only need to move the master cylinder just enough to squeeze the booster in and out. Then remove the vacuum line from the booster.
The booster is held to the firewall with four nuts that can be accessed under the drivers side of the dash. First remove the rod that attaches the booster to the brake pedal. Then remove the nuts that hold the booster to the firewall. Remove the old booster and install the new one.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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