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probably the master cylinder.
when i reversed, my brake pedal went all the way down to floor but kept going, had to use emergency brake to stop. This is with all new brake pads.
had the master cylinder replaced, brakes very good now, forward & reverse.
to keep you new master cylinder good shape, replace brake fluid every 3 yrs, or 30,000 miles. Brake fluid absorbs, Moisture and will ruin the seals, master cylinder again.
Especially if you have ABS, changing brake fluid important for proper function.
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