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What to do brakes have lots off petal when car is but none once turned on?

1. Check Brake Fluid Level: Ensure the brake fluid reservoir is full. Low brake fluid can cause a spongy brake pedal.

2. Inspect Brake Lines: Look for any leaks or damage in the brake lines. Damaged or leaking brake lines can affect brake performance.

3. Check Brake Calipers: Make sure the brake calipers are functioning correctly. Check for any stuck calipers or damaged components.

4. Replace Brake Pads: Worn-out brake pads can cause reduced braking efficiency. Inspect the brake pads and replace them if they are thin or worn.

5. Bleed Brake Lines: Trapped air in the brake lines can cause a spongy pedal. Bleed the brake lines to remove any air pockets.

6. Check Brake Master Cylinder: A faulty brake master cylinder can cause a loss of brake pedal pressure. Inspect the master cylinder for leaks or damage.

7. Inspect Vacuum Booster: Vehicles with vacuum-assisted brakes may experience pedal sponginess if the vacuum booster is faulty. Check the vacuum booster for proper operation.

8. Consider Brake Booster Check: If the brake booster isn't providing enough assist, it can lead to a soft brake pedal.

9. Test Proportioning Valve: Some vehicles have proportioning valves that distribute brake pressure. A faulty proportioning valve can cause spongy brakes.

10. Consult a Professional: If you're unsure about the source of the problem or don't have the necessary skills to perform the repairs, consult with a qualified mechanic.

Remember, brakes are critical to vehicle safety. If you experience any issues with your brakes, it's important to address them immediately to ensure safe driving conditions.