Few of us think about our brakes on a daily basis, but they are a critical component of a car and can mean the difference between life and death in an emergency. Proper maintenance and a quick response to warning signs will ensure that your car will stop every time you hit the brakes.
\n\nBrake systems come in two forms, disc and drum. They both work by using friction and resistance.
\n\nDrum brakes get their name because the components are housed in a round drum that rotates with the wheel. Inside the drum are a set of shoes that force the shoes against the drum when the brake pedal is depressed. The shoes are made of a friction material that is heat resistant.
\n\nIn a disc brake setup a rotor is connected to the wheel. Brake pads squeeze the rotor and cause friction, which stops the wheel from spinning.
\n\nOver time, this friction will wear down the brake pad, which is why they must be replaced on a regular basis. Calipers apply pressure to the brake pad. Calipers are powered by a hydraulic system.
\n\nThe hydraulic system consists of a master cylinder, a network of hoses filled with brake fluid, and calipers and/or wheel cylinders. When you press on the brake pedal, the master cylinder multiplies that pressure and causes the brake pads to close on the rotors and bring the car to a stop.
\n\nBrake systems require regular maintenance to ensure optimal performance. A fresh brake pad can be 8, 10 or 12 mm thick. Once the pad gets down to 3 mm it is time to have it replaced. Failing to do so can cause damage to your rotors. Rotors will also wear down over time, and when the thickness is too low to dissipate the heat, they will have to be replaced.
\n\nIn most cases your car will warn you that it is time to have a mechanic come out and look at your brakes. It might be a dashboard light, a screeching noise, or a number of other indicators. Here are the most common warning signs and causes of brake trouble.
\n\nEmergency Brake Engaged
\n\nIf your emergency brake is on, which is an easy fix, your dashboard light should come on to warn you. Depending on the vehicle the word \u201cbrake\u201d or a circle with an exclamation point in it will light up.
\n\nLoss of Hydraulic Pressure
\n\nLosing hydraulic pressure in the front or rear of the brake system can be an indicator of a leak. Your dashboard warning system should illuminate if this happens.
\n\nWorn or Uneven Brake Pads
\n\nBrake pads are fitted with an indictor that will contact the rotor and make a squealing noise when the pads have worn too thin. You will hear a screeching, clicking or grinding noise when applying the brakes. When the squealing turns into a grinding sound, you have worn through your brake pads and the backing plater is grinding against your rotors. This can severely damage your rotors and dramatically raise the cost of the repair. Uneven brake pads can result in the car pulling in one direction when the brakes are applied.
\n\nStuck Caliper or Slide Pin
\n\nIf a caliper or slide pin is sticking, you will notice your vehicle is pulling to one side when you brake. This and a collapsed brake hose (see below) can cause an acceleration problem. You may feel like your car is dragging along.
\n\nCollapsed Brake Hose
\n\nThis can result in calipers that move unevenly, which will pull the car to one side. This will present as an issue with the pads on one side thinner than the other.
\n\nBrake Line Issues
\n\nAir in the brake lines or damaged brake lines is a serious issue that should be addressed immediately. The major symptom of this would be a brake pedal that can be pushed nearly to the floor before the car stops. In order to check for a leak put an old white sheet or some cardboard under the car during the night. Look for a clear fluid that has the consistency of cooking oil in the morning.
\n\nWorn Parts
\n\nBad wheel cylinders, bad disc calipers, a worn master cylinder or bad brake booster can all cause serious safety issues. Mushy brakes can mean one or more of these parts is failing or malfunctioning. You should call your mechanic immediately if the brake pedal goes almost to the floor before engaging.
\n\nMalfunctioning Brake Booster
\n\nThis is the opposite of the soft pedal, if you must put a lot of pressure on the pedal before the brakes engages, there is a good chance your brake booster is malfunctioning or failing. Sometimes if you hear a whoosh noise when applying the brakes this, can be caused by the brake booster.
\n\nDirty Brake Fluid
\n\nBrake fluid that has been contaminated by moisture or has gotten dirty will also cause your brakes to grab and pull to one side. Having the fluid changed should clear up this problem.
\n\nWarped Rotors
\n\nA rotor will warp when exposed to extreme stress for an extended period of time. Stress can be caused by towing, mountain driving or any other situation that would put abnormal stress on the brakes. Warped rotors will cause your brakes to vibrate. Be careful not to park your car next to where your sprinklers are spraying after driving. The cold water hitting the hot rotor will also cause warping.
\n\nSticking Shoe Adjusters
\n\nThis is a common drum brake problem and will cause the brake pedal to go almost to the floor before engaging. This is often caused by sticking or rusting shoe adjusters on a drum brake. While adjusting the drum brakes can fix this problem in the short term, it will return until the adjusters are replaced.
\n\nWorn Brake Shoes
\n\nThis is the drum-brake version of worn brake pads. When the brake shoes wear too thin you will notice a squealing noise when you apply the brakes. Your brakes should be serviced immediately. If the noise turns into a grinding, the shoes are completely worn out and you are grinding on the drum. In most cases the drums will have to be resurfaced. Note that sometimes this squealing can be caused by brake dust. It is still better to have your brakes checked to make sure worn brake shoes is not the problem.
\n\nBroken Retracting Springs
\n\nIf the retracting springs on a drum brake are broken you will experience a pull to one side. This condition can quickly accelerate the wear on the brake shoes and cause the brakes to run hot. This can also cause your vehicle to not accelerate as it normally would.
\n\nBent Backing Plate
\n\nThe backing plate on a drum brake can be bent if the brakes are serviced improperly. You will notice grabbing brakes, noise and even brake lockup. This can also happen on the front brakes, causing a high pitched squeal when the wheel is turning but not braking.
\n\nWhether it\u2019s time for your annual brake inspection or you have experienced any of the symptoms listed above, a top-rated mobile mechanic will come to your home or office to perform a thorough inspection of your brake system.
\n\nIn addition to completing a test drive to get a sense of the symptoms you\u2019re experiencing when operating the car, the mechanic will examine the following components during the inspection:
\n\nAfter the inspection, the mechanic will provide a detailed report that describes the source and cause of the brake issue, along with the scope and cost of the necessary repairs.
\n\nThe mechanic will inspect the entire brake system (brake pads, rotors, calipers, master cylinder, fluid, hoses, drums, shoes, proportioning valve, ABS, and wheel cylinders).
\n\nThere is no safe operation of a vehicle without properly functioning brakes. If you suspect an issue with your braking system, do not drive the car and request an inspection as soon as possible.
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很少有人想到每天我们的刹车,但他们是汽车的重要组成部分,同时也可以在紧急情况下意味着生与死的区别。适当的维护和快速响应警告标志将确保你的车将会停止每次踩下刹车。
制动系统有两种形式,阀瓣和鼓。他们都工作通过摩擦和阻力。
鼓式制动器得到他们的名字,因为组件被安置在一个圆鼓轮旋转的。在鼓是一组鞋,迫使鞋鼓刹车踏板时抑郁。鞋是由一个耐热的摩擦材料。
在盘式制动器安装转子连接到车轮。刹车片挤压转子和引起摩擦,阻止车轮旋转。
随着时间的推移,这种摩擦刹车片磨损,这就是为什么他们必须定期更换。卡钳盘式刹车片施加压力。卡尺是由一个液压系统。
液压系统包括一个主缸,一个水管网络充满了制动液,和卡钳和/或轮缸。按制动踏板时,制动缸可以增添压力,导致转子上的刹车片关闭,将车停了下来。
制动系统需要定期维护,以确保最佳性能。一个新的刹车片可以8、10或12毫米厚。一旦垫下来3毫米是时候更换。未能这样做可以破坏你的转子。转子也会磨损随着时间的推移,当散热的厚度太低,他们将不得不被替换。
在大多数情况下,你的车子会提醒你,是时候有一个机械出来看看你的刹车。这可能是一个仪表板灯,一种刺耳的声音,或许多其它指标。这是最常见的征兆和制动问题的原因。
紧急刹车了
如果你的紧急刹车,这是一个简单的方法,仪表板灯应该警告你。根据车辆“刹车”或一个圆有感叹号会点亮。
液压损失
失去的前方或后方液压制动系统可以泄漏的一项指标。仪表板预警系统应该阐明如果发生这种情况。
穿或不均匀的刹车片
刹车片都配有一个指标,将接触转子和啸声噪音当垫穿太薄。你会听到刺耳的,点击或磨削噪音应用刹车时。啸声变成磨的声音时,你通过你的刹车片磨损和支持铁甲工是你转子摩擦。这可能严重损害你的转子和显著提高维修的成本。刹车片不均匀会导致刹车时汽车朝着一个方向。
把卡尺或滑销
如果一个卡尺或滑销是坚持,你会发现你的刹车时车辆拉到一边。这个和倒塌的制动软管(见下文)会导致加速问题。你可能觉得你的车拖。
倒塌的制动软管
这可能导致卡钳不均匀,将使汽车一侧。这将是一个问题与垫薄比另一侧。
刹车线问题
空气制动线或损坏刹车线是一个严重的问题,应立即处理。这将是一个刹车踏板的主要症状,可以推近到地板上之前,车停下来了。为了检查是否有泄漏或纸板放老白床单下汽车在夜间。寻找一个清晰的流体,食用油的一致性。
磨损部件
坏轮缸,坏盘卡尺,一个破旧的主缸或坏刹车助力器都可以导致严重的安全问题。糊状的刹车可能意味着一个或多个部分失败或故障。你应该叫你的机械师立即如果刹车踏板几乎与前地板。
故障制动助力器
这是相反的柔软的踏板,如果你必须施加很多压力踏板刹车进行之前,很有可能你的刹车助力器故障或失败。有时如果你听到嗖噪声应用刹车时,可能是由于刹车助力器。
肮脏的制动液
制动液污染的水分或已经脏了也会导致你的刹车抓住,拉到一边。有流体改变应该澄清这个问题。
扭曲的转子
转子经暴露在极端的压力会在较长一段时间。压力可以造成的拖,山开车或任何其他情况将异常压力踩刹车。扭曲的转子将导致你的刹车振动。小心不要把车停在旁边你的喷头喷洒后开车。冷水也热的转子会导致扭曲。
粘鞋子调节器
这是一个常见的鼓式制动器的问题,将导致刹车踏板几乎与前地板。这通常是由于粘或生锈鞋货鼓式制动器。虽然调整鼓式制动器可以解决这个问题在短期内,它将返回到理赔员所取代。
穿刹车片
这是鼓式制动器的刹车片。当刹车片磨损太薄你会注意到一个号叫噪音当你踩下刹车。你的刹车应立即维修。如果噪音变成了磨,鞋子是完全磨损和你磨鼓。在大多数情况下,鼓必须再度浮现。注意,有时这啸声可以由灰尘引起的。最好还是你的刹车检查以确保制动鞋不是问题。
破碎的缩回弹簧
如果收回在鼓式制动器弹簧坏了你会经历一个拉到一边。这种情况可以迅速加速刹车片的磨损,导致刹车热运行。这也可以使你的车不是通常会加速。
弯曲的垫板
鼓式制动器的制动底板可以弯曲如果刹车是保养不当。你会发现刹车,噪音甚至制动锁住。这也可以发生在前面刹车,导致一个高音尖叫,当车轮转动而不是刹车。
年度刹车检查的时间还是你经历了上面列出的任何症状,顶级移动机械将来到你的家或办公室进行彻底检查你的制动系统。
除了完成试驾来了解你正在经历的症状时操作汽车,机修工检查期间将检查以下组件:
检查后,技师将提供一个详细的报告,描述了刹车问题的来源和原因,以及成本的范围和必要的维修。
机修工将检查整个制动系统(刹车片、转子、卡尺、主缸液体,软管,鼓,鞋子,比例阀,ABS、和轮缸)。
无安全运行的车辆运转正常刹车。如果你怀疑你的刹车系统的问题,不开车,请求尽快检查。
我们的服务团队可以一周7天,周一——周五从早上6点到下午5点太平洋标准时间,周六,周日早上7点-下午4点PST。