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Fujian Jintai Machinery Manufacturing Co., Ltd.

Tel:0597-3232191

Address:No.168, getengping, Shifang village, Shifang Town, Wuping County, Longyan City, Fujian Province


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How to check and adjust the clearance between brake drum and shoe of small imported models?
Add Time:2019/10/19 14:04:21 From: Hits:2052
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(1) check the brake shoe clearance. Before checking the brake shoe clearance, check the thickness of the brake friction plate, which can be checked through the observation hole on the wheel brake base plate. When the thickness of the friction plate is less than the specified value, it indicates that the wear limit of the friction plate has been reached. It should be sent to the factory for repair and the brake shoe should be replaced. When the pointer at the brake adjusting cam of some small cars reaches the state of "end", the brake shoe shall be replaced.


Check the brake clearance when the brake drum is in the cooling state. Support the inspected wheel so that it can rotate freely. Press the outer circumference of the tire with both hands to check whether the hub bearing is loose. If it is loose, it should be adjusted. Otherwise, the brake clearance cannot be adjusted correctly. While checking the brake friction plate, the gap between the brake drum and the brake shoe can be measured with a plug gauge. If the clearance exceeds the standard, it shall be adjusted.


(2) adjustment method of brake shoe clearance. According to its structure, the wheel drum brake clearance adjustment device of imported small cars is mostly gear type, and the adjustment method is as follows:

Jack up the wheel and make sure that the wheel hub does not shake, remove the dust plug of the adjusting hole, check the quality of the shoe, and replace the shoe in time if it is worn to the ladder of the service limit mark.


When checking the clearance between the wheel brake shoe and the brake drum, press the brake pedal to the bottom, and measure the distance from the outer edge of the brake pedal to the front panel of the cab to be no less than the specified value. If it is less than the specified value, it means that the brake friction plate is worn and the clearance is increased, which should be adjusted.


When adjusting, insert a screwdriver through the adjusting hole, and move the adjusting gear in the direction indicated by the arrow until the wheel cannot rotate. Press the brake pedal several times, and after confirming that the wheel can't rotate again, reverse 4-5 teeth (if the wheel can still rotate). At this time, insert the plug gauge with appropriate thickness into the brake drum, and when pulling out the plug gauge, if you feel certain resistance, it is appropriate. If it does not meet the requirements, the adjustment gear can be moved for adjustment. Adjust the shoe clearance on the other side in the same way.


Turn the wheel by hand, and the wheel shall be able to rotate smoothly without sluggish wear. If you feel sluggish wear, loosen the adjusting gear back to 1-2 teeth. Install the dust-proof plug of the adjusting hole, then start the car, test the braking effect of the brake at the speed of 30km / h, and check whether there is eccentric braking or other abnormal phenomena. In case of eccentric brake or other abnormal phenomena, readjust the brake.


Some new drum brakes are equipped with shoe clearance self-adjusting devices. The self adjusting device works when reversing, so when reversing slowly, press the brake pedal. Some car self-adjusting devices are operated by hand brake. In this case, to pull up the hand brake lever, the purpose of adjusting the wheel shoe clearance can be achieved.

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