Why Is My Porsche Brake Pedal Lower Than Usual?

Your Porsche brake pedal is arguably the single most important safety component of your car. Think about it this way. It exists so that you can easily control brakes and of course, slow down. Without the pedal, there is a high likelihood you will get hurt either as you try to slow down or as you speed. This fact alone means your brakes should always be in perfect condition. As such, you have all the reasons to worry as soon as you notice your Porsche brake pedal is lower than usual. Read on to learn why this happens.

How the Porsche Brake System Works

The Porsche brake pedal basically employs a class two lever. That is why it gives you some form of leverage each time you step on the pedal. It is also why it is applying minimum force is enough to bring the car to a halt. Sometimes though, the brake pedal can suddenly get soft. It will then fall to a level that will appear lower than usual when idle.

Note that the Porsche hydraulic system heavily relies on brake fluid so as to transfer pressure from the brake pedal all the way to the brake pads. So when you step on the pedal, the hydraulic system will put pressure on the master cylinder. This will open the door for some brake fluid to flow into the system’s compensating port. Pressure inside the hydraulic system will then increase as the master cylinder applies more pressure on brake pads. This chain of events work the reverse way the moment your foot comes off the brake pedal. So why then does the brake pedal suddenly remain lower than usual? Here’s why.

Air inside The Hydraulic System

Nearly all automotive brake systems that use hydraulics are designed to operate without air. The Porsche hydraulic system is not an exception. Over time, air creeps into the system. This hardly ever ends well. Since the main function of the fluid in a brake system is to cause pressure, air stands out as an unwanted contaminant because it eliminates the required pressure. But this happens as your Porsche brake pads wear. In other words, the more your brake pads wear, the more brake fluid is needed so as to apply the appropriate energy needed to brake. Each time you use extra fluid, air quickly fills the void and pressure decreases. This then forces the pedal to go lower than it should.

Faulty Brake Lines

Porsche brake lines are made of both rubber and steel. Hard steel brake lines, which are assumed to be the most effective, allow brake fluid from other components like the proportioning valve and the master cylinder to travel to all disc brake calipers as well as wheel cylinders. That is exactly where rubber brake lines come into the picture. They are used on all wheels to connect steel brake lines to wheel cylinders and calipers.  With time, the steel brake lines gradually corrode. The lines then leak and rust kicks in. before long, rust contaminates the brake fluid. This causes rubber seals inside the brake calipers and master cylinder to tear off. This will give you a spongy pedal which will most likely always remain low even when idle.