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How to Adjust Excessive Free Travel in a Car's Brake Pedal?

1 Answers

PenelopeMarie

07/30/25 6:39am

When the free travel is inappropriate, simply loosen the lock nut on the master cylinder push rod, then rotate the push rod to alter its length. This changes the gap between the rod and piston, thereby adjusting the free travel. After adjustment, tighten the lock nut. Additional notes: 1) Brake pedal free travel is essential for proper brake system operation. 2) To measure free travel, place a ruler vertically between the brake pedal and cabin floor. Press the pedal downward until resistance is felt, noting the ruler reading. Release the pedal and observe the new reading - the difference between these values equals the free travel. 3) During inspection, gently press the pedal to measure free travel until increased resistance is detected. This value should not exceed 45mm. The effective brake pedal travel is 135mm, with total travel being no less than 180mm. The distance from pedal to steering wheel rim must be ≥598mm. If measurements don't meet specifications, adjust the push rod length accordingly, ensuring the free travel isn't affected by additional floor mat thickness.

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