Brake Pedal Feels Soft or Spongy

A brake pedal that sinks toward the floor or feels mushy is a safety issue — there is air, fluid loss, or a hydraulic failure somewhere in the system.

Severity: Critical

What to Do Right Now

Do not drive far with a sinking pedal. Check the master cylinder reservoir level first, then look for leaks at all four wheels. Bleed the system if no leaks are found.

Common Causes

1. Air in the brake lines: Air is compressible; fluid isn't. Bleed each caliper in the correct order using fresh fluid until clear bubble-free fluid comes out. Shop brake fluid
2. Leaking caliper or wheel cylinder: Look for wet spots on the inside of the wheels or fluid on the ground near a tire. Replace the leaking unit and bleed. Shop brake caliper
3. Cracked or swollen brake hose: Old rubber hoses balloon under pressure, robbing pedal feel. Flex the hoses while a helper presses the pedal — bulging means replace. Shop brake hose
4. Failing master cylinder: Internal seals leak past, letting the pedal slowly sink under steady foot pressure. Replace the master cylinder and bench-bleed before installing. Shop master cylinder
5. Contaminated brake fluid: Brake fluid absorbs water over time, lowering its boiling point and causing fade. Flush every 2–3 years with the correct DOT spec. Shop brake fluid