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NO. the vacuum is used to make the brake pedal easy to push, power brakes. the pedal would be hard without vacuum, that is why the pedal gets hard with the key off and engine not running. the problem you are having is more of a hydraulic problem. Have the brakes checked asap. the brake system may have a leak causing the pedal to go low. check the fluid level and if it is low or empty then there is a problem, could be a rotted brake line leaking or a wheel cylinder leaking.
have someone have there foot on the brake & start vehicle, inspect the flexible brakelines to see if any are balooning out. You could also clamp off one flexible line at a time & press brake & when you find the brake at fault the pedal will go hard.
You need a new brake switch located at the base of the brake pedal. Its cheap and easy to replace if you dont mind crawling under your dash on the floor board.
I have the solution to your problem I have been thinking about it sir what is going on with you is you have air in your system and you did not properly bleed out your braking system that is why your pedal is touching the ground
Many vechicals required maintenance to the brakes. Check your fuilds, usually pedel to floor means lack of fluids and also air in your break lines. Try cleaning grease your pins get the condition up to par. While you have the wheels off have a friend pump the brakes pedal and leave pedal to the floor Bleed your brake line one at a time there is a screw on the caliper release (usually on japan car 10mm screw) and tighten back up repeat proccess two times to brakes all around. Make you should you have brake fuild on hand buy the big bottle DOT3. If this process doesn't help than your would need to replace the master cyclinder, and booster
pump the pedal until it goes hard this is common when you push it back all the way just needs a few pumps to get it to extend back to the pads making contact with the rotor, is there any fluid leaking anywhere? is there brake fluid in reservoir?
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