What angle should the pushrod and slack adjuster make in the released position?

In the released position, the pushrod and slack adjuster should typically form an angle greater than 90 degrees. This configuration ensures that there is sufficient clearance in the brake system when the brakes are not applied, allowing for proper function and preventing any premature wear or binding that could affect braking performance.

When the angle is greater than 90 degrees, it indicates that the braking system is adequately disengaged, which is crucial for maintaining the overall health of the air brakes. It allows the brake shoes to fully retract, ensuring that they do not drag against the brake drum and that heat buildup is minimized.

Choosing an angle of exactly 90 degrees or less risks misalignment or insufficient disengagement, which could lead to increased wear or ineffective brake operation. It’s vital for technicians to recognize and maintain this greater-than-90-degree angle during inspections and adjustments to ensure reliable and safe braking performance in school buses.