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Zorluk: KolayBrake System Components Inspection

During a pre-trip inspection of commercial vehicle foundation brake components, a driver measures the applied pushrod travel to ensure brake chambers are within allowable operating limits. Place the following procedure steps in the correct chronological order from first to last.

  1. 1Park the vehicle on level ground, chock the wheels, and release the parking brakes.
  2. 2Place a reference chalk mark on each pushrod directly at the face of the brake chamber.
  3. 3Apply the service brakes firmly with 90 to 100 psi of air pressure using an assistant or brake pedal depressor.
  4. 4Measure the distance from the chalk mark to the brake chamber face to determine total pushrod stroke.

Cevap

The correct sequence begins with securing the vehicle and releasing the parking brakes, followed by placing a reference mark on the pushrod, applying full service brake pressure, and finally measuring the distance from the mark to the chamber face.
The mark-and-measure method requires establishing a reliable zero reference while the foundation brakes are completely released and the vehicle is safely chocked. Once marked at the chamber face, full service brake application moves the mark outward. Measuring the gap between the mark and the chamber face yields the exact working travel distance of the pushrod.

Adım Adım Çözüm

1
Secure the vehicle on flat ground with wheel chocks and release the spring parking brakes.
The vehicle is prevented from rolling and the pushrod returns to its fully released baseline position.
Pushrod travel cannot be accurately measured while parking brakes are holding the chamber extended.
2
Make a distinct mark on the pushrod where it enters the brake chamber housing.
A zero-point reference line is established on the retracted pushrod.
This mark provides the starting reference needed to measure displacement.
3
Fully apply the service brakes using normal application pressure (90–100 psi).
The pushrod extends outward from the chamber housing, moving the slack adjuster.
Service air pressure forces the diaphragm and pushrod out to actuate the foundation brakes.
4
Measure the distance between the chalk mark and the chamber face with a ruler.
The exact applied stroke length is obtained to compare against commercial vehicle safety limits.
Verifying stroke length ensures pushrod travel is within legal tolerance and the brake is properly adjusted.

Anahtar Kavram

Brake chamber pushrod travel measurement procedure (mark-and-measure method)
Tahmini Süre:45s
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Brake System Components Inspection

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