Several possible causes for a soft brake pedal.
One is that the back brakes are probably drum brakes, and they need to be adjusted properly in order to reduce the distance from the shoes to the drum.
Another is that the master cylinder could be leaking fluid back into the reservoir when it should be pushing fluid to the wheels under pressure.
If you have opened and replaced any of the hydraulic system, there could be air in the system that needs to be bled out.
You could also have a bad power brake booster, that would make the pedal had and cause the engine idle to change when you hit the brakes.
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Did you change any of the hydraulic components such as wheel cylinders,calipers,or master cylinder?
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