One morning with no warning the brake pedal goes to the floorboard with no resistance at all. Brake fluid was low so I added some - no effect. I replaced the brake master cylinder, again no effect - pedal still just goes to the floor. What now?
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Re: Brakes are gone
Look under vehicle and see if any fluid is in backside of whhel
The vacuum booster may be drawing in the beale fuid through a bad seal within.. Old master cylinder should have show leakage at mointing to assist .. After failure of the sort thebrakes may need to be blrf
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Low or empty brake fluid . No red brake light lite . Brake line corroded maybe , where do you live ? Rust belt USA . Just had a similar problem in a 2005 chevy cavalier . Did you have to stop really fast ?
Sound like you have a Master Cylinder failure, you brake fluid is full, and no pedal resistance, if the brakes feel spongy then you may just need to have your brakes bleed, and got air in you brake lines, if you found that your brake resivoir tank low and added some recently, then maybe it pulled air into your lines.
Good luck. Rick.
This is caused by low brake fluid, check the brake fluid in the master cylinder, its low and as it moves around it turns light on, as the brakes wear the calipers open and take in more fluid so the resivoir gets low, this would not affect the brakes but have them checked to make sure there not to low or at your next service have them check the brakes and just add fluid for now, hope this is helpful, good luck.
If the light is on all the time, it could mean you simply forgot to release the parking (emergency) brake. The brake warning light remains on when the brake is set as a reminder. If the brake warning light remains on when the parking brake is released, then something is amiss.
In some cases, the brake warning light may remain on if the switch on the parking brake pedal or lever is misadjusted. Nothing is wrong with the brakes and a simple adjustment should fix the problem.
If the brake warning light comes on when you apply the brakes, or is on continuously, it means that hydraulic pressure has been lost in one side of the brake system or that the fluid level in the master cylinder is dangerously low (due to a leak somewhere in the brake system). In either case, the fluid level in the master cylinder should be checked. Adding brake fluid to the master cylinder reservoir may temporarily solve the problem. But if there's a leak, the new fluid will soon be lost and the warning light will come back on.
Brake fluid leaks are serious because they may cause the brakes to fail! So avoid driving the vehicle until the system can be inspected to determine what's wrong. Leaks can occur in brake hoses, brake lines, disc brake calipers, drum brake wheel cylinders or the master cylinder itself. Wet spots at hose or line connections would indicate a leak that needs to be fixed.
Leaking brake fluid can also contaminate the brake linings, causing them to slip or grab. The uneven braking action that results may cause the vehicle to veer to one side when the brakes are applied. Brake shoes or pads that have been contaminated with brake fluid cannot be dried out and must be replaced.
someone probably topped off your brake fluid when your brakes were low. the only way i know is to have new front and back brakes then make sure the brake fluid level is right . the light only comes on if your brake fluid goes low so the system has too much fluid if it says full and your brakes are not new front and back
Check for leaks under the car. Look carefully at the back of each wheel for dampness or wet areas that would identify where the leak is. If there is nothing evident, no spots on the ground where you park, etc, check under the dash where the master cylinder is attached to the firewall (INSIDE the car, not under the hood). Again, check for any evidence of leakage. If the master cylinder leaks, it can usually only be confirmed by looking under the dash, and because of the location, usually goes unnoticed. The fluid level may have gone down low enough to allow air into the system, which is causing the low pedal. Check this out asap, as this is too dangerous to drive. In an emergency situation, a panic stop wouldn't give you time to pump the brakes to stop.
check your brake fluid, if fluid is low light will come on. the only other time is if the brake pedal looses preasure and then the pedal would be low, also you may what to have brakes checked, when fluid goes low it also means brakes may be low, hope this is helpful.
I believe driving on the donut spare has nothing to do with the problem-it isn't all wheel drive option is it? You say you added brake fluid, how low was the level? If it is losing fluid, you might have a rusted brake line that is leaking. Any evidence of a leak under the van? It's possible the master brake cylinder is bad, but this seems to be a sudden start of the problem. Did the tire blow out or did you go out to find it flat in the morning? I believe this is a leaking brake line issue. It is possible that if the tire blew out while driving, or you hit something (like debris) in the road, it may have damaged a brake line. As I mentioned earlier, it could just be a rusted leaking brake line. If brake fluid leaked on the exhaust or any hot components, it would give off a 'chemical' smell ( or even have an odor if it just leaked out) Let me know what you find.