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I think you have air in the brake lines.

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15y ago
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Q: Why does brake pedal feel normal most of time but occasionay go to floor on LX450?
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If a truck has a clutch brake it would only be used when coming to a complete stop. By pushing the clutch peddle completely to the floor you would apply the clutch brake. This stops the clutch disc from spinning making it easier to shift into 1st or reverse gear. Normal shifting while driving you would not need to or want to push the clutch peddle to the floor to activate the clutch brake.

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Can the brake booster cause your brake pedal to go to the floor?

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