Make sure you are using a port in the intake manifold that is no smaller than a 3/8” NPT. We have seem many instances where people will use a port that is way too small, not allowing the engine to pull the proper vacuum through the fittings. An obstruction in the hose could also be limiting vacuum contributing to the brake problem, so be sure to check this area thoroughly.Īnother quick check would be the location of the vacuum source within the engine and the fittings used to install the vacuum hose. If it is sucking shut, there is no chance of a vacuum being pulled on the unit. If you are running a fuel hose, when the engine is running and pulling vacuum on the booster, there is a good chance that the hose is sucking shut. The proper hose to ask for is 11/32” vacuum hose. Fuel hose is designed to resist expansion but won’t resist sucking closed like vacuum hose will. The most common problem we see is a person will be using a 3/8” fuel hose. You should look at things like the hose supplying the booster from the engine. This completely removes the engine from the equation and provides the proper vacuum level to the system.īefore jumping directly to a vacuum pump though, there are a couple of quick and simple things that should be investigated. It plumbs into the brake system using a vacuum hose going from the booster directly to the pump. An external vacuum pump is basically an electric motor built to provide vacuum to the booster that your engine can’t provide. If sufficient vacuum isn’t being supplied within the booster, you may have to consider installing an electric vacuum pump, or canister depending on how far below 18-inches the vacuum pressure has dropped. When this happens, the pedal gets harder. An improper amount of vacuum creates a scenario where the diaphragms can’t move the pushrod into the master cylinder. Your brake system’s booster works by a series of diaphragms inside the booster and air on both sides of the diaphragm. Without the proper vacuum level, a brake booster will get a progressively harder pedal and eventually end up at a point where you feel like you are pushing against a wall. The booster requires 18” of vacuum to operate at full efficiency. In gasoline-powered cars, the engine provides a partial vacuum suitable for the brakes’ power booster. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. Vacuum – or really lack of vacuum pressure – is the most common cause of a hard brake pedal, and therefore the first thing to look at when a hard pedal is present. Let’s take a closer look at diagnosing the most frequent causes and solutions related to a hard brake pedal. You have to practically stand on the brake to slow the vehicle down, but it does so eventually. To your horror, nothing happens! The pedal is stiff as a plank of wood. Up ahead traffic begins to slow and you gently tap the brakes. You’re cruising down the highway, wind flowing through your hair and “Born to be Wild” pumping from the stereo. Here’s a scary scenario we all dread as drivers.
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