Brakes in Jeep not working.

The brakes in my Jeep do not work. The pedal goes to the floor.
Experienced mechanics share their insights in answering this question :
When the brake pedal goes straight to the floor that can usually mean one of two things. Either the brake master cylinders internal seals have gone bad causing the fluid to leak past them meaning that the hydraulic system can no longer exert pressure on anything, or there is a very serious leak of brake fluid in the system. Automotive brakes work due to the integrity of the hydraulic components that make up the brake system. If any of these components are leaking internally or externally the pedal may go to the floor. I would recommend having a professional from YourMechanic come inspect your brake system to find the source of the problem.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common cause of brake failure is loss of brake fluid. The fluid transfers the force you exert by pushing down on the brake pedal to the brake disks that slow and stop your car`s wheels. You can usually detect a leak before getting on the road because you`ll see it underneath your vehicle.
Fiat Chrysler Automobiles (FCA) is recalling more than 154,000 Jeep and Dodge vehicles because of a brake-system issue. The automaker said that a faulty brake-system component installed on some vehicles earlier this year may cause bubbles to form in the brake fluid, which could increase stopping distances.
Low Brake Fluid: Your Parking Brake light is a multifunction device, and is designed to illuminate if the fluid level in the reservoir drops below a certain point. You may notice the light turning on or off when going around turns as the fluid level changes.
This can be due to a number of problems: a leak in a brake line, a loss of pressure within the master cylinder itself due to a failed seal, or air being introduced into the braking system. Your first reaction to encountering spongy brakes should be to rapidly pump the brake pedal with your foot.
When brakes are not as responsive as what they should be, or if the brake pedal “sinks” down to the floor, this is a possible indication of a braking system leak. It could be a brake fluid leak, or a brake hose air leak.
If you`ve noticed that your car`s brake pedal feels weak or spongy, the most common cause is air in the brake fluid. Try bleeding the brakes and topping up the brake fluid to the fill line in the reservoir. If the problem persists, take the car to a garage for a full brake system inspection.
If your brake service warning light is always on, it could be due to a need for parking brake adjustment, worn brake pads, or hydraulic issues. If your brake service warning light turns on when you hit the pedal, it could be due to hydraulic loss on one side of your vehicle or low brake fluid in the master cylinder.
Sounds, smells and sensations signal brake problems: Screeching, grinding, squealing, rubbing, and other eardrum-piercing noises are common indicators that your brake pads & shoes require inspection.
Common Reasons Brake Lock Up

Overheated braking system. Using the wrong brake fluid. Damaged or broken parts (calipers, brake pads, pistons, rotors, or others)

Stay calm and try not to panic. Push the brake firmly with both feet and hold it down. Don`t pump the brake pedal or release it because you will lose all your vacuum power assist, causing your brakes to become stiff and very hard. Shift the car into neutral.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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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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.

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Brake lights are not working. replaced brake light swtch still no brake lights. the third brake light the connection was melted at
ANSWER : The first thing to do is to repair third brake light and replace the brake light fuse and then see if the third brake lights work and the lower lights start working? If only the 3rd brake light starts working then you may need a further checks on the turn signal flasher or switch could be bad.

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Okay so when I turn my lights on at night my brake lights do not work, when I don’t have my lights on they work fine.
ANSWER : Hi there. Based on your inquiry, it’s highly probable that you have a damaged light switch or some electrical fault inside the turn signal relay. However, it’s also possible that the brake switch above the brake pedal could also be the source of your problem. Due to the fact that multiple electrical components might be causing this issue, it’s a smart idea to first have a professional mobile mechanic complete a brake lights are not working inspection, so they can determine what’s causing all of these issues and recommend the right repairs.

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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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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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Brake lights on trunk not working
ANSWER : For some reason, when consulting the wiring diagram, I don’t see a trunk mounted brake light listed. I only see the high mount (one in the rear window) listed. Regardless, if the trunk bulb is not working with a new bulb, there is a problem with the circuit. Check for both power and ground at the bulb. Once you’ve determined which is lacking, you’ll have to trace the circuit to determine where the problem lies. Since you said all of the other brake lights work, the cruise control is likely unrelated. Electrical diagnosis can be difficult, so I suggest you have a trained professional tackle the problem with your brake lights for you.

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