Brake seizing in the rain.

When it's raining and I hit a puddle or there's a lot of water on the road, my brake light comes on and the brakes seize. I've noticed this last time that my air was on, so I turned it off to see if there were any noises, and the light shut off. I played around with the AC a couple times and the brakes kept acting up when I turned the air on (only in the rain ). I was hoping to get some insight before going to a mechanic.

My car has 100500 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. Your AC should not have anything to do with your braking system. The brakes may very well tend to lock up at times in wet or slippery conditions as that is a function of the anti-lock braking system. Your car is equipped with wheel sensors on all of the wheels which monitor wheel speed and relay this info to the ABS system. When this senses that the car may be out of control or potentially in slippery conditions when wet, this will trigger the ABS system to engage which is normally the seizing feeling you are experiencing. An expert from YourMechanic can come to your home to diagnose your braking system so that this can be addressed properly.

How to Identify and Fix Common car Problems ?

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What is causing this? The brake pads have metal in them, and the rotors are made of metal, and when it rains they get wet and surface rust will immediately start to rust the rotors. As soon as you start to drive off, the noise is the rusted rotors and metal pads grinding off the rust. This is normal for most vehicles.
The same can be said for your brakes—brakes that are wet become slippery too. When driving in the rain or snow, it takes longer for your brakes to actually bring your car to a stop than on a warm, dry day. This effect is only magnified when your tires or brakes are in poor condition.
Water can cause damage to hot brake rotors, causing warping, which will result in a rough stopping vehicle. Water can also seep into your brake lines and cause braking system failure.
LF Hyundai Sonata sedans are being recalled due to a possible stability control-related brake failure. Hyundai has issued a safety recall for the current version of the Sonata mid-size sedan. The potential fault relates to incorrect fitment of the brake tubing or seal ring on the brake booster system.
Brakes require friction from the pads and disk to bring the vehicle to a stop. So driving through a puddle or high water the brakes get wet and the friction isn`t there and the vehicle can`t stop until the friction returns.
The wet weather should not affect the performance of the brake callipers on your brake discs unless you have been through very deep puddles. Motorcyclists should be especially careful of manhole covers and painted road markings as they will be more slippery. Any oil or diesel on the road will reduce the grip, too.
Although the flat and uniform surfaces of the rotors and drums (which act as a drag for the friction material on brake pads and shoes) can feel slippery to the touch, water and damp weather affect them very little as it pertains to braking ability.
Over time, your brake rotors build up rust from everyday humidity and moisture, especially if you live in an intensely humid or wet climate. As a result of that rust, you`ll likely hear squeaking or squealing when you apply pressure to the brake pedal.
Brake pedal feels soft or mushy and car is hard to stop: If your brake pedal has been feeling softer and softer over time when you apply it, this is a definite sign of bad brake fluid. Moisture that has built up in your brake fluid can boil under the heat and pressure of hard braking, creating air in the brake lines.
According to the recall notice posted by Transport Canada, the brake lines under the vehicle could corrode and fail over time. If this happens, brake fluid could leak and reduce braking power, resulting in longer braking distances and increasing the risk of a crash.
How long do Hyundai Sonata brake pads last? Hyundai Sonata brake pads usually last between 30,000 and 70,000 miles depending on your driving habits. If you commute in heavy traffic and use your brakes often, you`ll need to get an inspection more frequently.
Once through the water, always dry the brakes by moving your vehicle slowly while applying light pressure on the brake pedal. Wet brakes do not stop the vehicle as quickly as dry brakes.
Sintered brake pads

Sintered, or metallic, brake pads are made of a mixture of metallic particles pressed together. They are more durable than organic pads and should last longer because they can handle dirt and damp conditions a lot better.

Rain, snow, and humidity can also cause your brakes to squeak. This is usually due to condensation collecting on the rotors. Under such conditions, the noise shouldn`t last long once the brake pads have warmed up.
Every hydraulic brake system should be bled and refilled with fresh fluid to remove moisture. A simple method to accomplish this without bleeding is to suck most of the fluid out of the master cylinder with a pump or kitchen meat basting utensil. Make sure you don`t expose the circuit to air when taking the fluid out.
The most common cause of failure is a leak in the brake lines. The brake fluid will slowly drain out, until there isn`t enough left to transmit the pressure from the pedal to the tires. The brakes can also fail when the discs or drums wear out, so they can no longer put enough friction on the wheels to stop them.
Brake Pedal Pulsation: Warped Brake Rotors

If the brake pedal pulsates and you can feel your vehicle shudder and shake when you press the pedal, that often indicates a problem with your vehicle`s brake rotors. On most modern cars, the brakes function by the caliper clamping down onto the brake rotors.

The classic symptom of a failing master cylinder is a brake pedal that “dives” or sinks slowly to the floor while pedal pressure is being applied. Another sign to look out for is any leaks around the master cylinder. If a seal is worn out, it may leak past the seal and onto the pushrod that attaches to the brake pedal.
Yes, many Hyundai Sonatas have been known to last well beyond 200,000 miles with proper care and maintenance. Some owners have reported driving their Sonatas for over 300,000 miles before needing major repairs.
Timewise and distances, a Hyundai Sonata can last a driver for up to 250,000 miles or up to 17 years on average. If you drive less than the average 15,000 miles annually, then your Sonata may last you longer.
Keeping the brakes on your car lubricated is crucial to ensure that they work properly. It is critical to make sure that brake caliper lubricant or grease is applied to the correct part of the brake; an incorrectly lubricated brake can cause it to stop working entirely.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

Read Full Q/A … : Brake seizing in the rain.

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

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Low brake pedal and anti-lock brakes are not kicking in.
ANSWER : The brake pedal is working to stop the vehicle, but there may be air in the controller unit causing the ABS brakes to not function. I recommend bleeding the brake system from the farthest location from the master cylinder to the master cylinder including the ABS unit. If the brakes are still spongy after a full bleed, then the controller will need to be replaced. If you need further assistance with your brake pedal being spongy, then seek out a professional, such as one from Your Mechanic, to help you.

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Supportive bar attached to brake pedal interrupts proper braking process
ANSWER : It’s possible to have someone alter the brake pedal or adapt a brake pedal from a different vehicle. You may call around to some customization shops to see if anyone is interested in taking on the project. But first, I would try reaching out to the selling dealer with your concern – especially since it is a new model. Good luck.

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I replaced the brake light switch. Gear lever unlocked because it had locked. Now the brakes feel hard.
ANSWER : Hi, thanks for writing in. You need to check the brake switch install adjustment. You may have the switch adjusted too tight and it is holding the the brake pedal partly down. This will cause the brake master cylinder to not release the brakes when you let off the pedal. Readjust the switch away from the pedal until you feel some free play again in the pedal. This should fix the problem. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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Brake sensor is to sensitive causing brakes to flicker while driving. 2005 Mercury Montego
ANSWER : Hi there – your brake light switch needs a minor adjustment. It is adjusted too "tight" or close to the brake pedal lever, or possibly has failed. Adjusting/replacing it will eliminate this flickering problem. I recommend a brake light isn’t working inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

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Hard brake pedal and rear brakes locking up.
ANSWER : Hi. I will help you with this issue you are having with your 2001 Durango. Unless you bled the master cylinder, it is possible there is still air in the system. If you car is equipped with ABS, air could have also gotten trapped in the ABS modulator. If ABS equipped, a bi-directional scan tool would be essential to manually activate the ABS system to clear air from that segment of the lines while you are bleeding the system. It is also possible that in all of this work somehow the proportioning valve has been affected causing the desired pressure differential, front versus back, to get out of spec. Using a 2,500 PSI gauge, you can check the pressures at each wheel and that will definitely give you a clue as to which brake circuit is the issue (or both), whether the proportioning valve is working properly and whether the line pressures at each wheel are within spec. Should you need a second opinion, by all means feel free to contact YourMechanic for assistance and we will diagnose and repair the issue for you.

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Changed brake master cylinder, bled 10 times, and the pedal is soft The rear brakes are not locked but close. Truck now running rough.
ANSWER : You will have to bleed the brakes from the farthest location all the way to the master cylinder. There is still air in the lines causing the issue. Check the vibrations on the vehicle to see if the engine mounts are damaged or if the brakes are not releasing causing the engine to run harder than normal to overcome the braking force. If you need further assistance with your vehicle’s brake system, then seek out a professional, such as one from Your Mechanic, to help you.

Read Full Q/A … : Brake seizing in the rain.