How much push rod travel is allowed?
4) At the brake chamber, measure from the fixed point to the mark on the push rod. 5) Type 30 Brake Chamber equipped with manual slack adjusters has a maximum allowable push rod travel of 1 3/4 inches (44 mm).
How do you check the brake chamber pushrod travel?
Pull the chamber push rod out to its limit by pulling on the slack adjuster arm or by prying with a short bar. If push rod travel is more than 3/4 in. (19 mm), brakes MUST be adjusted.
How do you identify a long stroke brake chamber?
square shape is an acceptable identifier of a long stroke chamber. Examples of square shapes embossed into chamber pressure caps. Many long stroke brake chambers have identification and service data stamped, cast or embossed onto the metal parts of a brake chamber. Others are provided with an adhesive data label.
What is pushrod stroke?
The pushrod stroke of each brake chamber is critical to the proper function of a brake system. As the brakes wear, brake pushrod stroke increases. When brake pushrod stroke exceeds the adjustment limit, the brake is out of adjustment.
What is a push rod in a truck?
A pushrod is basically a metal tube designed to transfer the reciprocating motion of a valve lifter, riding on the camshaft, to the valve.
When brake chamber push rod stroke exceeds the adjustment limit?
Inspection of brake adjustment at each wheel should be performed with air pressure between 621 and 690 kPa (90 and 100 psi ), the engine shut off and service brakes fully applied and spring brakes must be released. When pushrod stroke exceeds the adjustment limit of the brake chamber the brake is out of adjustment.
What determines maximum legal stroke of a brake chamber push rod?
The brake chamber pushrod regulation stroke limits were established to ensure there is sufficient pushrod travel to apply full force to the foundation brake under all operating conditions. The limits are based on the size of the brake chamber and whether the chamber is a standard or long stroke design.
Can a truck driver adjust his own brakes?
A driver may be qualified by the motor carrier to perform a limited number of tasks in connection with the brake system, e.g., inspect and/or adjust the vehicle’s brakes, but not repair them.
How do you measure a brake chamber?
Brake chamber size can be determined by measuring the diameter of the clamp used to hold it together or by locating the size markings on the brake chamber. The most common brake chamber size is 30. However, there are vehicles using both smaller and larger sizes.