![]() Determine the adjustment limit for the brake chamber.Determine the number size (such as 16, 20, 24 or 30) and type (such as standard or long-stroke) of the brake chamber.This is measurement number 2.) Subtract measurement 1 from measurement 2 to calculate the applied pushrod stroke measurement (See Diagram 11-2). (Remeasure and note the distance from the previously selected point on the pushrod to the previously selected fixed point at the brake chamber. Method 2: Measure the applied position of the pushrod.Method 1: Measure the distance from the brake chamber or fixed reference point to the mark on the pushrod (See Diagram 11-1).(Continue to use the previously selected method). Press and hold the brake pedal in the fully applied position.Raise or lower the air pressure by running the engine or pumping the brake pedal until both the primary and secondary air-tank gauges display 621 to 690 kPa (90 to 100 psi).(Measure and note the distance from a point on the pushrod to a suitable fixed point at the brake chamber. Method 2: Measure the released position of the pushrod.(Use chalk, soapstone, marker or other similar instrument - marks must be narrow and precise.) ![]() Method 1: Mark the pushrod at the brake chamber or at a suitable fixed reference point.Ensure air pressure is above 621 kPa (90 psi) and release the spring brakes.Secure the vehicle with wheel chocks or blocks.Also, some brake systems have covers or housings that conceal the brake linkage, making it impossible to inspect brake adjustment using the techniques described here. It is important to note that the body design and suspension of some vehicles may limit safe access to certain brake components unless the vehicle is supported on a hoist or is over a pit or ramp. Step-by-step procedure for measuring applied pushrod stroke The most reliable method for inspecting brake adjustment is to measure the applied pushrod stroke. It is critical to use correct inspection methods to obtain reliable inspection results. Standard brake chambers have round ports. The most visible and permanent of the markings used to identify long-stroke brake chambers are the square ports. Markings are placed on the brake chamber body to indicate that it is a long-stroke brake chamber, and only long-stroke diaphragms are to be used as replacements.A trapezoidal tag is placed under the clamp bolt that indicates the brake chamber’s maximum stroke dimension.The air lines attach to a square port in the brake chamber body.Long-stroke brake chambers can be identified by three visible characteristics: The type of brake chamber also affects the specified brake adjustment limit, which can vary by 19 millimetres or more between standard and long-stroke brake chambers. This will avoid the need to measure a brake chamber or locate size markings. You are most likely to determine the size of the brake chambers on any vehicle through your employer or the vehicle owner’s manual. Locating and reading the size markings on a brake chamber may require removing dirt, corrosion and paint from the surfaces. Measuring the diameter of brake chambers requires a special tool. For example, sizes 16, 20, 24 and 36 brake chambers may be used. However, there are vehicles using both smaller and larger sizes. The most common brake chamber size is 30. 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. Since adjustment limits vary depending on the size and type of air brake chamber, you must be able to identify the particular brake chamber in use. Each air brake chamber’s pushrod stroke must not exceed the specified adjustment limits. When brake pushrod stroke exceeds the adjustment limit, the brake is out of adjustment.īrake pushrod stroke must comply with the Ontario Highway Traffic Act and regulations. To determine whether brake adjustment is correct, the pushrod stroke must be inspected at least daily. Brake wear occurs at varying rates, depending on the type of vehicle and driving conditions. As the brakes wear, brake pushrod stroke increases. The pushrod stroke of each brake chamber is critical to the proper function of a brake system. Brake adjustment must be inspected regularly This chapter explains how to carry out such an inspection. Drivers of vehicles with air brakes must inspect brake adjustment regularly using a reliable inspection method. Proper brake adjustment is important to your safety and that of other road users.
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