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2003 dodge neon brakes are hard when engine off but soft with engine on?
Wiki User
∙ 12y ago
because the hydraulic system pumps are running when the engine is on (power brakes), assisting you in applying the brakes. if your car did not have a brake assist pump, the pedal would always be difficult to press.
Actually, there is no "hydraulic system pump", but a vacuum assist device. It is that large, round, metal thing that the master brake cylinder is attached to. Obviously, it operates on the engine's vacuum while the engine is running. With the engine off, there is no vacuum, and therefore no assist. There is a big, rubber diaphragm inside it, which is operated on by the engine vacuum. Pushing down on the brake pedal opens up the vacuum. When you let up on the brake pedal, springs return it to the original position. Occasionally they develope small leaks in the diaphragm, and have to be replaced. I have done this once as a "shade-tree" mechanic, who was trained in the U.S. Air Force. It is not an easy job.
Wiki User
∙ 12y ago
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