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Failed Master Cylinder would be my guess. Replace the Master Cylinder.
Any sudden brake loss can be the cause of 1. brake line damage 2. master cylinder disfunction
Usually, a loss of pressure in your brake system means that there is a hole somewhere in the system. A leaking brake line or a punctured reservoir could cause a loss of pressure. A bad master cylinder could also cause a loss of pressure in the back brakes.
Brakes probably need to be bled especially if you have recently had any work done to them..A bad master cylinder could also cause this.
This could be caused from the closing off of the flex line or a bad caliper or a bad master cylinder
No, a busted brake booster will not cause the brake pedal to go to the floor. It will however cause the brake pedal to be extremely hard to push. A defective master cylinder will cause what you describe. Replace the master cylinder and bleed the brakes. It can because it happened to me. The booster lost vaccum and the pedal went to the floor. Sorry, you are wrong. The only reason the pedal went to the floor was because the master cylinder failed. The brake booster only boosts the pressure on the master cylinder and allows you to not have to push so hard on the brake pedal. Cars of yesteryear did not even have a brake booster and they stopped just fine albeit you had to push the pedal allot harder than with power brakes. A failing brake booster will not cause your pedal to go to the floor although it might cause it to go lower than normal before the brakes apply. As long as the master cylinder is good you will still have brakes, but you will have to really push hard and might even have to pump them up in order for them to stop the car.
what you have could be one of three problems. Check your reservoir to see if it has plenty of brake fluid, bleed your brakes,they may of lost the fluid while changing brakes. Also, if you have a vacuum leak it will cause your brakes not to work. Or it could be your master cylinder or your vacuum booster that has went bad. brewski
The cause can be traced to a few things. Number one the master cylinder may have failed. Number two you could be low of brake fluid or have none at all due to a leak or broken brake hose. If the power brake booster fails you may think you do not have brakes because it requires an excessive amount of pressure on the pedal to activate the brakes. Whatever the cause do not drive this car into you have the brakes repaired.
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.
Go buy a new master cylinder. Follow the instructuins on how to bench bleed it. Remove the brakelines attached to the old master cylinder. 2 bolts hold the master to the brake booster. BE CAREFUL NOT TO ALLOW TO MUCH AIR IN THE LINE. THAT WILL CAUSE YOUR BRAKES TO BE SPONGY. Reverse the procedure with the new master. Bleed the brakes in order(RR/LR/RF/LF). Once that is done, take the truck out and see if the brakes are tight or soft. If you have to much pedal, go some place where you can back up at 10 or 15MPH and hit the brakes HARD. This will adjust the rear drums. Do this step until your brakes feel firm but not to tight. This is a quick and dirty version of what needs to be done. Get a manual and read up. Explorer4x4.com is a good resource.
Check the calipers. If the calipers pistons are extended to far - this could cause the brakes to lock up. The pistons cannot be retracted.
if back brakes are drum i would think they are worn out not allowing pistons in wheel cylanders to return. also could be valve in master cylander.altho that would cause all brakes to lock up. if disk brakes your calipers need overhauling or replacing