The history of the problem could be an important aid to diagnosis. Did it happen suddenly or over an extended time, has there been any repairs or maintenance carried out recently?
Does the brake pedal really go all the way to the floor without providing any braking effort or is there braking effort at the end of a long travel?
Can the brake pedal be "pumped up" by operating rapidly and if it does how does it feel?
If there is drum brakes on the rear it is possible for automatic adjusters to fail which can cause the pedal to go half-way to the floor.
Excess free play in a wheel bearing can push disc brake caliper pistons back after driving a short distance so the first application of the brake is long but the second is shorter.
Sometimes when a twin-piston caliper has one seized piston or a pad seized into the carrier as the pads wear the brake continues to work by flexing the brake disc until it is gripped between the pads. This situation produces a long spongy pedal feel and if not rectified it can lead to failure when a disc eventually breaks.
Check for brake fluid leaks in the complete system. if no leaks found you may have a master cylinder that is bad.
Check your brake fluid in the master cylinder.
It is usually mounted on the firewall.
If it is empty you have a leak on one of your wheels.
Testimonial: "thanks my fluid is full see no leaks it is probably the master cyclinder then ok"
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