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What is Brake Pedal Free Play?

1 Answers

SawyerLee

07/29/25 1:57pm

Here is the relevant introduction about pedal free play: 1. Introduction to pedal free play: Pedal free play is set to ensure no brake dragging occurs and the brake is fully released. To measure it, place a straightedge between the brake pedal and the cab floor. Press the brake pedal downward by hand until resistance is felt, and record the straightedge reading. Then release the pedal and check the straightedge reading again. The difference between the two readings is the pedal free play. For hydraulic brakes, the pedal free play is generally 15-20mm, and it should be adjusted according to the specified value for the vehicle model. 2. Adjustment: When the free play is inappropriate, loosen the lock nut of the master cylinder push rod, turn the push rod to adjust its length. After adjustment, tighten the lock nut again. The free play of the brake pedal in a Santana sedan refers to the pedal travel when the push rod contacts the master cylinder piston upon pressing the pedal. During inspection, lightly press the pedal by hand and measure the pedal travel until the hand feels resistance. The travel should be ≤45mm. The effective travel when the brake pedal is fully pressed should reach 135mm, and the total travel of the brake pedal should be ≥180mm. If the inspection fails, it can be corrected by adjusting the length of the push rod.

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