What is the free travel of the brake pedal?

1 Answers
LeGabrielle
07/29/25 10:10am
The free travel of the brake pedal is set to ensure that there is no brake drag and to completely release the brake. The following is a related introduction about the free travel of the brake pedal: 1. Function: To prevent the brake pads and brake discs from becoming too tight and overheating, which could lead to brake failure. Without free travel, braking would be very uncomfortable and could even cause the wheels to lock up on their own. 2. Brake pedal free travel: To measure, place a straightedge between the brake pedal and the floor of the cab. Press the brake pedal down by hand and note the reading on the straightedge when free resistance is encountered. Then release the pedal and observe the reading again. The difference between the two readings is the free travel of the pedal. 3. Adjustment: The free travel of the brake pedal should be 1 to 8mm. If the free travel does not meet this specification, check whether the bolt of the pedal arm shaft and the installation of the master cylinder are loose, or whether the components are excessively worn. If any issues are found, tighten or replace them as necessary.
Was this review help?
18
0
Share
More Forum Discussions

How to Solve Excessive Fuel Injection Pulse Width?

Solutions for excessive fuel injection pulse width are as follows: 1. Check if the oxygen sensor and coolant temperature sensor are aging: Excessive fuel injection pulse width usually needs to be considered in conjunction with idle speed. If the idle speed is high and the pulse width is large, it is generally caused by inaccurate signals from the throttle position sensor or coolant temperature sensor. If the idle speed is normal but the pulse width is large, it is usually due to a faulty oxygen sensor. 2. Inaccurate closed-loop data received by the ECU: Among these data, the oxygen sensor and coolant temperature sensor are the main factors, though the intake pressure sensor and throttle position sensor cannot be ruled out. You can use a Bluetooth OBD scanner to check the vehicle's internal conditions or have the data rechecked by professionals at a testing station.
3
5
Share

How long to release the brake when the car shakes during hill start?

Release the brake when the car shakes for about five minutes during hill start. Here are the precautions for hill start: 1. Lift the clutch: When lifting the clutch, observe the RPM or engine sound. When the RPM meets the requirement or the engine emits a low sound, slow down the speed of lifting the clutch and then gently press the accelerator. 2. Prevent rolling: Before releasing the handbrake, it is best to observe the road conditions ahead. If it is an uphill or downhill, it is recommended to press the brake with the right foot, slowly release the clutch, and when the car starts to shake significantly, stabilize the clutch pedal with the left foot, slowly release the brake with the right foot, and when the car starts to move, completely release the brake.
3
1
Share

How to Clean the Original Carpet Under the Car Floor Mats?

Here are the methods to clean the original carpet under the car floor mats: 1. Organic cleaning solvents: Primarily used to remove grease, lubricants, dirt, silicone polishes, rubber processing aids, and fingerprints from the surface of the car. Commonly used organic solvents in China include kerosene, gasoline, toluene, xylene, trichloroethylene, carbon tetrachloride, and No. 200 solvent gasoline. Imported organic solvents include Prep-sol, P, Kleano, etc. 2. Two-in-one cleaner: Also known as two-in-one shampoo, it is a high-grade cleaning agent. The term 'two-in-one' means it combines cleaning and care functions, providing both cleaning and waxing capabilities to meet the requirements of quick cleaning and waxing.
13
4
Share

What are the voice commands for Stage 3 lighting test?

Stage 3 lighting voice commands are as follows: 1. High beam: Driving at night on roads without streetlights or with poor illumination. 2. Low beam: Meeting non-motor vehicles on narrow roads at night, following vehicles closely in the same direction at night, and meeting vehicles at night. 3. Alternating between high and low beams: Passing through arches and crosswalks at night, navigating sharp turns and slopes at night, and crossing intersections without traffic signals at night. 4. Hazard warning lights: Vehicle breakdown on the road at night that obstructs traffic and is difficult to move, and driving in foggy conditions. Additional information: During the test, there will be voice prompts for lighting usage. Operations must be completed within 5 seconds after the voice prompt ends. Do not act too slowly, but also do not act before the prompt finishes.
9
5
Share

Does canceling a Subject 2 appointment count as one attempt?

Subject 2 appointment cancellation does not count as one attempt. Below are the relevant regulations for exam appointments: 1. Subject 2 appointment: If an applicant is unable to attend the exam at the scheduled time, they must apply to cancel the appointment one day in advance. If the applicant fails to attend the exam at the scheduled time without canceling, the exam will be deemed as a failure. 2. Continuous exams: After passing Subject 1, the applicant can schedule an appointment for Subject 2 or Subject 3 road driving skills test. In some regions, applicants may simultaneously schedule appointments for both Subject 2 and Subject 3 road driving skills tests. If the appointments are successfully scheduled, the exams can be taken consecutively.
18
2
Share

What to Do When a Manual Transmission Car Cannot Shift Gears After Starting?

Adjust the gear shift mechanism; if that doesn't work, the transmission may need repair, and it's recommended to take it to a repair shop. Here is more information about manual transmission shifting: 1. Reasons for inability to shift gears: no fuel, dead battery, incorrect gear position, fuel quality issues, lack of antifreeze, P-lock solenoid valve failure, internal failure of the gear shift lever assembly, incomplete clutch disengagement. 2. Shifting techniques: Always depress the clutch pedal fully before shifting; operate the gear shift lever gently, quickly, smoothly, and accurately; master the timing of shifting, avoid skipping gears, and downshift according to speed; shifting actions should be continuous, the clutch should be fully depressed in one motion, and gear engagement should be done in one step.
2
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.