![]() Inspect the clevis pins connecting the chamber to the automatic slack adjuster to ensure they turn freely and are coated with an anti-seize lubricant. Inspect the return spring on the air chamber or on the service side of double diaphragm spring brakes. Inspect the cam head and rollers for abnormal wear.Ĭheck the brake drums for maximum diameter and surface finish, and replace if necessary.Ĭheck the brake shoe return springs to ensure a proper return to the “zero stroke” position. ![]() Where component replacement is necessary, Bendix stresses the use of OEM-equivalent equipment to ensure correct operation and peak performance.Ĭheck for proper lubrication of the brake camshaft and cam tube. Once the automatic slack adjuster itself has been inspected, use the following checklist to examine other wheel-end components and fix any situations that can lead to overstroke. (Bendix recommends using an NGLI grade 2 lubricant at every preventive maintenance inspection, which is approximately every three months or 30,000 miles.) (For example, the Bendix® Versajust® slack adjuster test is described on page 6 of the product Service Data Sheet.) Also check the manufacturer’s recommendations for lubrication of the adjuster, noting the suggested mileage, frequency, and lubricant grade. Start by referring to the manufacturer’s instructions and mechanism tests to determine whether the slack adjuster is properly adjusting the brake. Instead, investigate why the brake is over the stroke limit. Under CVSA inspection guidelines, drivers can incur fines if 25 percent of a truck’s wheel-ends are out of adjustment. ![]() Wheel-ends beyond the maximum allowable stroke are considered out of adjustment. Check the CVSA guidelines to determine the maximum allowable stroke, which is based on the chamber size and type. The difference between the two measurements is the chamber stroke. To measure the chamber stroke on each wheel-end, Bendix typically recommends checking the distance from the chamber to the pin with the brakes released, and again after a full brake application. ![]() “It’s a stark illustration of the importance of including brake stroke measurement in any pre-trip wheel-end inspection.” “During the Commercial Vehicle Safety Alliance (CVSA)-sponsored Roadcheck inspections in June, approximately 3,700 vehicles in the United States and Canada were removed from service due to brakes out of adjustment,” said Mark Kromer, chief engineer, actuation/slack adjuster products, Bendix Spicer Foundation Brake LLC (BSFB). ![]()
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