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Brake booster issue in swift - Cars & Trucks
The first thing you need to confurm is the brake warning light on on the daskboard . If it is then its likely a problem with with a leak in the hydrloic system . If brake fluid can get out then air is getting in the system .So check all of the wheels if you have a leak you will see it on the inside of the tire also check inside the cab at the top of the brake pedel where the rod comes from the back of the master cylinder if you see oil them the master is bad . The booster control unit is an anistest system that is powered by your main engine vacuum witch is the 1/2 inch hose connected to it under the hood . The way the unit works is it has a diafram inside it and when you push on the pedel the pressure on the front side of the diafard becomes lower and the engine vacuum draws it forward to asistist by putting more pressure on the master cylinder . Its hard to test but if you can hear a suction noise when you hit the brake and the pedel goes from hard to soft or any combination like this it could be the problem but the hiss noise is a dead give away it dose draw air in but it should not come out when the brake is applyed . And keep in mind that this problem could also be a bad master cylinder that has blowen internialy and would not set the warning light off because there is no leak or in balance in the hydrolic system . But would realy screw with the brakes so they would work one time and be low or high from lock up to vary little brakes the next and the master is also vary hard to test . But brakes are vary redondent and rarly completely fail Good luck with it John
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