I'm going to assume you mean while driving and not that the brakes have broken. So two of the most common factors of brake failure that I hear and read of are:
1. You may have air in your lines which will drasticly change pedal feel and performance of the brakes. In this case the lines will have to be blead, you can do this yourself but if you have any doubt get a professional to do it.
2. I'm assuming you have an older car as it would be rare for a new car to have braking problems, in which case if you are running rubber brake fluid lines the lines could be expanding reducing line pressure. This is easily fixed by fitting braided lines, be sure to buy lines that will be able to withstand the pressure.
Ans 2 - Brakes are every driver's responsibility. -Check fluid frequently, check pads at least every 3 months.
The two most common causes of brake failure are inattention and neglect !
in older cars with 4 wheel drum brakes riding the brakes down a hill will heat up the drums causing the brakes to fail. another cause is brake lines failure another cause is leaking wheel cylinders shall i go on? The most common part that fails in a braking system is the Master Cylinder.
brake failure
I would say -1. leaks in a seal at brake cylinder. 2. Running low on brake fluid. (Did you check YOURS this week ? )
The most common cause is failure of the Master Cylinder. Leaking wheel cylinders & calibers is another cause. Of course worn brake pads or shoes can cause defective brakes. Lastly would be a broken brake line hose.
Yes . Over time brake fluid can leak out and cause a failure.
pray
Contaminated brake fluid.Rusted, rotted brake lines.
Parking brake is on, Brake fluid is low, Hydraulic failure of the brake system.
get your btrakes checked regularlly
Your brakes are failing
Get it repaired
Brake Failure