Your Porsche brake pedal is specially designed to help you have optimum control over the amount of pressure you need to apply on it. But if you’ve driven different Porsche models for quit sometime, you may have already noticed that sometimes, the pedal can suddenly become stiff. It then becomes so hard to press on it. More often than not, the car will still brake as it should. However, the stiff brake pedal will give you an unnerving feeling. This means your Porsche driving experience will not be as rewarding as it should be. Read on to learn more.
The Brake Pedal Concept
Modern Porsche models come complete with brake systems that are vacuum assisted through a brake booster. The vacuum diaphragm simply increases the force that you apply on the brake pedal. In other words, it makes it easy for you to brake without using so much energy.
The brake pedal becomes depressed anytime the vacuum source is closed off. This allows some amount of atmospheric pressure to get on one side of the vacuum diaphragm. Once this happens, the master cylinder pistons immediately apply brakes. The vacuum then returns to both sides of the vacuum diaphragm the moment you remove your foot from the brake pedal. The master cylinder on the other hand returns to their normal position. This chain of events may be disrupted and the brake pedal may suddenly become hard to step on. This is often because of any of the following reasons.
Bad Brake Booster
This is by far one of the most common culprits behind stiff brakes. A glitch on the brake booster, however minor means the vacuum assist won’t work. You will have to use extra energy while stepping on the brake pedal. The best solution here is to replace the bad brake booster with a new one.
Leaking Vacuum Hose
The vacuum hose can have an individual component at fault or it can be entirely broken. Either way, it will leak. This is of course a serious problem as it means you may not be able to break at all. There is an upside though. Fixing the problem is not usually expensive as it involves replacing the leaking vacuum hose with a new one. Note that this problem may sometimes be as a result of valve malfunction. This happens when the valve, which is supposed to allow air to exit the booster but not to enter, breaks down. This means you have to inspect both the vacuum hose as well as the valves so as to know exactly where the problem is.
Wrong Size Parts
If the brake pedal is still hard even after booster replacement, then there is a high likelihood that the replacement parts you got were incompatible. In other words, they were incorrect as far as size and other fittings are concerned. It could be a case of having a booster of the wrong weight or size which is a common mistake especially among inexperienced mechanics. This explains why it is important to always have your Porsche serviced, inspected or repaired by an approved Porsche expert at an approved Porsche repair facility.