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一辆 GL662东风牌大客车,一次行驶中紧急制动后,随之出现制动“发咬”,两后轮制动鼓高温。作原地操作制动试验,发现两后轮气室推杆约1分钟后才能回位。起初以为是快放阀故障,换新快放阀后依然如旧。解体双腔制动阀(总泵),发现分管后制动的前腔挺杆,因油垢多且 O 形密封圈发胀,使其运动受阻。由于双腔制动阀至快放阀这一段制动管内未及时排出的压缩空气,从上
A GL662 Dongfeng brand buses, a driving emergency braking, followed by brake “hair bite”, two rear brake drum temperature. For in-place operation of the brake test and found that the two rear wheel chamber push rod about 1 minute before returning. At first thought it was quick to put the valve failure, after the new quick release valve still as old. Disintegration of dual-chamber brake valve (master cylinder), found in charge of the brake after the former chamber tappet, due to more grease and O-ring swollen, making its movement blocked. As the double-chamber brake valve to the quick release valve in this section of the brake pipe is not discharged in time compressed air from the top