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What is Brake Pedal Free Travel?

2 Answers

AsherRose

07/29/25 3:04am

Pedal from the stop position to the step to the end of the distance. The following is part of the introduction about the brake pedal free travel: Function: The pedal free travel is a function set to ensure that there is no brake drag and the brake is completely released. Measurement: When measuring, place a straightedge between the brake pedal and the cab floor, press the brake pedal down by hand until there is resistance, and record the straightedge reading. Then release the pedal and look at the straightedge reading again. The difference between the two readings is the pedal free travel. The free travel of the hydraulic brake pedal is generally 15-20mm, and it should be adjusted according to the value specified by the vehicle model.

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VanCollin

08/12/25 6:57am

As a seasoned mechanic with over a decade of experience, I find the brake pedal free play quite fascinating. Simply put, it's that initial empty movement you feel when pressing the brake pedal before the actual braking force kicks in. This 10-20mm buffer gap in the braking system prevents accidental brake engagement. Too much free play (like pressing the pedal forever without slowing down) can cause accidents, while too little leads to premature brake pad wear and costly repairs. I often see car owners neglect this until their brakes fail, forcing emergency checks/adjustments on master cylinders or assemblies. A quick periodic shop measurement can save money and headaches. After 10+ years on the road, I've seen enough cases to know this isn't something to take lightly.

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