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Brake peddle should be hard, if bake peddle soft check master cylinder or replce, try bleeding brake system too. Ceck if check valve is bad this is located on vacumm line from intake manafold to booter pump body. brake seal at check valve booster pump should hiss if not check vaccumm line for leaks if no leak in line replace check valve they don't cost much.
same as any nother car. take off mastercylinder cap. get a helper set in the drivers seat. apply pressure to the brake peddle. with a box or tube wrench break the fluid *** on the top of the calliper/back of drum loose. foot pressure on peddle should push it to the floor -hold it on the floor! tighten the *** on the caliper/drum tight-ish. not over tight. then let peddle up off floor. pump till you get resistance/tighteness. hold pressure on peddle, loosen *** again and peddle will go to floor again tighten ***, lift up peddle pump for pressure. repeat untill all air is out of line/ or fluid runs out clear. never let the master cylinder get low on fluid. have plenty on hand. repeat for all 4 tires.
Your bake booster has failed causing a massive vaccume leak when you apply the brakes. That in turn gives more air to the system so the computer tells it to add more fuel thus causing the rpms to go up. Replace it %99.5 chance that will fix it.
You might have a leak in one of your brake lines i would look at all of the lines for a leak look at the brake drums for fluid driping out of the bottom if you dont find a leak it may be time for a brake job . a soft peddel means you have air in your system.From a leak or wore out pads or shoes or a leaking wheel cylender from wore out rear shoes . watch your master cylender to see if its low on fluid.
Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes). ...maybe have an assistant push on the peddle while you listen with a piece of hose or a stethescope to find the leak (or I suppose the power unit diaphragm could be shot/leaking--hence replacement), but since you said after bumpy road etc, one could hope for a simple dislodged vacuum hose or fixable crack.
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