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It isn't that bad of a job if you are able to get under the dash to remove the actuator rod from the brake pedal and unbolt the 4 bolts that hold the booster to the firewall. Other than that, you just have to unhook the vacuum line from the booster under the hood and remove the two bolts that hold the master cylinder to the booster. You do not have to open up the brake system, so there is no need to worry about having to bleed the brakes.
run a teat. Remove the vacuum line from the brake booster and plug off. Start engine and see if it idles normally. . Put your foot on the brake pedal and apply the brakes . If the idle is still normal replace the brake booster as there is an air leak in the diaphram.. The service light is probably recording misfiring and air fuel mixture problems.. run fault codes any way just to check it out .
make sure check brake light fuse first if brake light fuse okay.you replace brake light switch by removing trim panel below steering column.look under brake pedal area unplug electrical connector .remove the cotter pin and pull switch and power brake booster pushrod off the pin.then slide switch off power brake booster pushrod dont lose small nylon washer when installing new brake light switch.
Yes sound like brake booster. most of time when booster is going bad makes hissing sound when brake applied.But should not make any kind of air leakage noise at all.Replace brake booster.Hope this was helpful for you.