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What is the Free Travel of a Hydraulic Brake Pedal?

2 Answers

SanAlina

07/29/25 2:16am

Brake pedal free travel is designed to ensure no brake drag occurs and to completely release the brakes. The relevant details are as follows: 1. Pedal free travel: To measure, place a straightedge between the brake pedal and the cab floor. Press the brake pedal downward until resistance is felt, and note the straightedge reading. Then release the pedal and check the straightedge reading again. The difference between the two readings is the pedal free travel. 2. Free travel of a hydraulic brake pedal: Generally ranges from 15-20mm, and should be adjusted according to the specified value for the vehicle model. 3. Adjustment of brake pedal free travel: The brake pedal free travel should be 1-8mm. If the free travel does not meet this specification, check whether the pedal arm shaft bolt and master cylinder installation are loose, or if any components are excessively worn. If any issues are found, tighten or replace them as necessary. Additionally, check if the pedal return spring and brake light switch assembly are correctly installed, and make appropriate adjustments if needed.

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VonLucia

08/12/25 6:15am

Hydraulic brake pedal free play refers to the empty travel when pressing the brake pedal before the brakes actually start working. As an experienced driver with many years behind the wheel, I can tell you this play acts like a buffer zone, giving your foot some freedom to avoid sudden braking at the slightest touch. Standard free play should be between 5 to 10 millimeters. Too little makes the brakes overly sensitive, causing jerky stops and unstable driving; too much delays braking response, increasing rear-end collision risks on highways. I regularly check mine by measuring pedal height change with a ruler—if resistance comes after slight depression, the gap is normal. Remember, this is a designed clearance in the hydraulic system, not a malfunction, but if it exceeds 20mm, get it adjusted immediately at a repair shop. Never overlook this small detail during daily driving—it directly impacts road safety.

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