A hard brake pedal is most often caused by a lack of vacuum, but can also be caused by using the wrong hose, using a defective brake booster check valve or using a defective booster. It is also possible to run a combination valve where the valve is no longer centered, which can cause a hard pedal in a person's car.
Drum brakes that are stuck can be another cause of hard pedal as can a pedal ratio of 1:1. It is recommended for drivers to make sure that their wheel cylinders are moving freely if they have drum brakes and that their pedal ratio is 4:1. It is also important for a person to make sure that they have a brake booster that is appropriate for the weight of their vehicle. Too many people use a small brake booster for a heavy vehicle, which can result in hard pedal.
When a brake pedal is hard to press, it makes it harder to stop. This can lead to accidents if not corrected. The most common cause of the brake pedal, not enough vacuum, can be corrected by adding enough vacuum to the car. The car should have a 18-inch vacuum for optimal results. Anything less than this will make it more difficult for a person to push the pedal. If the problem persists then the car should be taken in to a garage to be fixed.Learn More
There are several things that can cause a bad brake booster including a bad vacuum. A brake booster needs vacuum pressure to work effectively so a lack of pressure can cause failures. Other causes of booster failure include broken springs and ruptured diaphragms.Full Answer >
There are four primary reasons that brake calipers begin to stick: malfunctioning caliper slides, worn out brake hoses, dry or rusty caliper bolts, and debris inside the brake caliper piston. Because brake calipers have many different parts that need to perform different functions to provide their slowing and stopping power, there are many different possible reasons for a caliper to stick.Full Answer >
Common causes of uneven brake pad wear include driving with warped rotors, a clogged brake line or leaky calipers. Vehicles that are heavier in the front than in the rear can wear brake pads unevenly due to an uneven distribution of weight. Debris in the breaking system, such as rocks or other foreign objects, wears brake pads down unevenly as well.Full Answer >
There are a variety of things that can cause a brake pedal to feel spongy, such as a defective master cylinder, a twisted hard line or incorrectly adjusted rear calipers. The only way to determine the cause is by taking a look at the braking system or taking the vehicle to a qualified mechanic.Full Answer >