Isuzu Wizard having hard brakes all of sudden. The brake fluid sign is on the dashboard but if you remove a wire on the brake booster it goes off. What is the problem?
The symptoms you describe suggest a failure of engine vacuum to the brake power booster (or hydraulic system pressure if your vehicle has hydro-assist braking), or a failure of the brake power booster itself. Any of these failures would require much greater pressure on the brake pedal to stop the vehicle. The wire you mention goes to a warning sensor which indicates the problem. I recommend having a professional mobile mechanic come to your location to perform a brake system inspection. This inspection will provide a diagnosis and recommendation of parts that are needed to safely correct this issue.
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Brake fluid absorbs moisture, which may enter the brake system from exposure to the air. Over time, the presence of water will cause sludge to build up, limiting the movement of the brake fluid and causing your pedal to feel stiff.
Brake fluid in the booster can damage the booster diaphragm. Not only that, a brake fluid leak will reduce hydraulic pressure in brake lines and possibly introduce air into the brake fluid, reducing pressure even further.
Regularly Check the Brake Fluid Level
Maintaining the brake fluid level of your vehicle is an important part of keeping your brakes in good working order. Low brake fluid can cause a stiff brake pedal, making it difficult to stop the car, so it`s important to check the level regularly.
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. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate.
The most common causes of your brakes not releasing is a seized caliper or brake pad. This typically occurs due to rusting or ageing.
If brake fluid becomes too full of moisture, problems can arise when the fluid becomes hot under braking, with the moisture turning to vapour inside the brake lines. This leads to a soft, spongy brake pedal feel, and will stop your car braking as well as it should.
Corrosion. Another common cause of sticky brakes is corrosion within the caliper pistons due to old brake fluid.
The loss of brake fluid leads to a loss of hydraulic pressure, so the brake pedal will feel soft or low and go to the floor.
Low brake fluid will cause air to fill the gaps in your brake line—leading to soft brakes. Spongy brake pedals can be both terrifying and dangerous—especially if you do not get them serviced at the first sign of an issue.
Damages the brakes – Slamming on the brakes too hard will damage the car brakes themselves. This can overheat the brake pads, causing them to wear down faster which could then cause problems with the brake rotors and suspension.
Brake Booster Check
With the car turned off, pump the brake pedal four or five times until you get a hard brake pedal. Continue to hold the brake pedal down with moderate pressure and start the vehicle. The brake pedal should drop.
A Spongy, Squishy Brake Pedal
If the booster check valve is blocked, it won`t suck out air molecules from the vacuum brake booster as efficiently. And if it`s broken, it may let air into the brake booster.
Brake fluid can deteriorate or become contaminated over time, affecting brake performance.
Overfilling the master cylinder reservoir with brake fluid is a common mistake that causes larger problems with your brake system. Almost all master cylinders on the market today have a max line on the side. The reservoir should not be filled past this line.
Brake pedals should always feel firm when you press down. If your pedals ever feel soft and spongy, you should immediately get your vehicle inspected, as a spongy brake pedal is a symptom of failed braking components in the car.
Common signs of a faulty vacuum brake booster check valve include the brake pedal being difficult to engage, feeling spongy, or not working at all.
Generally, the hydraulic brake booster will last as long as your car does. There are some factors that can lead to the booster being damaged and having to be replaced.
A leaking brake booster may also cause an engine to run badly. Leaks in the brake booster provide a vacuum leak to the engine. One quick test for leakage, is to turn the engine off and press the brake pedal.
If you don`t notice a leak, there could be other reasons the fluid is low, such as: Worn out brake pads. If the brake pads become worn out, more fluid gets stored inside the calipers. This can lead to less brake fluid in the master cylinder.
Low Brake Fluid
If the brake fluid level is low, it can reduce the hydraulic pressure in the brake system, causing the brake pedal to feel spongy or soft, and the car to shake or vibrate when you apply the brakes.
YOU SHOULD REPLACE BRAKE FLUID EVERY FEW YEARS
And the best way to find out how often to change brake fluid is to follow your manufacturer`s recommendations. Some manufacturers say you should replace your brake fluid every two years. Others recommend every three years, or every 45,000 miles.
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Typical brake line pressures during a stop range from less than 800psi under “normal” conditions, to as much as 2000psi in a maximum effort.
A brake booster increases the force applied to the brake pedal, amplifying the hydraulic pressure delivered to the master cylinder. This allows for more effective braking, making it an essential safety feature for any vehicle.