Air in the brake lines
brek pads
The e-brake cable(s) could be stuck.
If you are losing fluid and the pedal is low, you have a brake fluid leak.
Typically, that comes from having air in the lines.
Most likely has a leak somewhere in the line, or the switch in the parking brake petal is bad. my switch went bad, just removed the bulb, cheap fix
I do not, but depression could cause this.
Yes, calipers can cause the brake pedal to feel hard and not go to the floor if they are seized or malfunctioning. This can create excessive resistance in the braking system, preventing the pedal from fully depressing while still allowing for some brake engagement. Additionally, issues such as a blocked brake line or a malfunctioning master cylinder can also contribute to this symptom. It's important to have the braking system inspected to identify the exact cause.
Probable cause is a warped front disk brake rotor. The rotor can be "turned" to eliminate vibs if not too worn.
A hard brake pedal can be caused by several different factors. It can be as simple as the brake pedal getting caught on something to the power brake booster being bad. You could also have a brake pad or shoe that is sticking, causing the brake fluid to boil. When brake fluid boils, it expands and can cause the hard brake pedal that you feel. A brake pedal that is hard to press can also be caused by a build-up of water in the brake line. The water in the brake line lowers the boiling point of the brake fluid. A hard brake pedal can also be the result of a restriction in the brake line, such as a bent brake line or foreign material in the brake fluid. The most common cause of a hard brake pedal is the sticking brake pad or shoe, causing the brake fluid to boil. Tracking down what is causing the hard brake pedal can be frustrating, to say the least. Take the vehicle for a drive and when you come back, feel your brake lines near the wheels. Caution: The line may be very hot! If one is extremely hot, you may have just found the culprit causing the hard brake pedal.
It seems like there might be air in your brake system. You should try bleeding your brakes and filling it with fresh brake fluid.
Brake vibration is usually caused by the brake rotors being warped. The rotors must be machined or replaced to correct the problem. if you can feel it in the steering then the drums are or rear rotor could be warped
If the brakes on your 1995 Lexus SC400 feel too hard, it could be due to a few reasons. One common cause is a malfunctioning brake booster, which may be failing to assist in brake application, leading to a stiff pedal feel. Additionally, issues with the brake fluid, such as being low or contaminated, can also impact braking performance. It's advisable to have a professional inspect the braking system to identify and address the specific issue.