Volvo Car Brake Fault Diagnosis and skidding – Maintenance – Automotive repair a
Symptoms: Brake System not working, light braking, deviation Comparative Study and Integration, to continue to use, the braking system. Road brake test, check the brake pedal height and hardness meet technical requirements. Related Reading: DIY car repair auto repair self-taught how to transform into sharp brother Improper operation of his car repair care killed "five taboo"
Fault analysis and diagnosis: First determine the system working in the vacuum booster, vacuum booster with a vacuum gauge measuring pump, vacuum value compliance. To determine the vacuum booster and brake master cylinder hydraulic pump distribution, then the table in the round cylinder Department survey, the results show: the difference is about zero, and start with the non-starting the vacuum booster vacuum booster, wheel cylinder pressure is reduced by half (from 8MPa reduced 4MPa), and remove the brake, the four-wheel rotation flexibility, note back into the oil and oil is normal.
Remove the friction block, measuring about 10mm thickness are, lower surface roughness, and the disk surface is very smooth, replace the friction blocks, brake properly. Analysis of friction sliding blocks of reasons:
Friction block material deterioration. Much of the material currently used is basically composed of a mixture of organic material, usually made of resin or rubber and asbestos, metal fiber and additive mixing with processing. However, the actual friction block more bad working conditions, there is static friction and sliding friction, not only to withstand the water soaked, but also accept the severe impact caused by excessive Wear and tear . Therefore, the friction block in the working process, we should try to avoid material deterioration caused by high temperature. If the vehicle down the process, Drive Members of prolonged or frequent use of brakes, the friction block and brake disc sliding friction caused by prolonged high temperature, high temperature polymer materials are decomposed, resulting in a number of gases and liquids, gases as the medium generated in the friction interface squeeze pressure and reduce the effective contact pressure, while the liquid is formed between the two contact surfaces of thin film lubrication, the friction coefficient decreased, reducing the braking efficiency.
Brake disc while there were hardness, high temperature, iron (Fe) atoms will be oxidized to Fe2O3 and Fe3O4, carbon (C) atom oxidation of CO and CO2, damaged brake disc element distribution within the volume and material properties not only reduce the hardness, but also aging fast cooling will be deformed, resulting in rapid wear of brake disc, lower disc surface roughness, but also produce a trench, even if the replacement of the friction blocks, brake effect is not improved, and deformation serious cases, result in dynamic balance wheel is damaged, Car body Shake .
Friction block brake slippery conditions used, the temperature will be more and more likely to cause wheel cylinder brake cylinder temperature increased, rubber apron expansion, size increase, decrease braking ability, poor oil return. Deformation of aluminum alloy pistons, not only caused the cylinder or partial wear, severe cases, surface adsorption of metal impurities also cause death of living Seca. These are the factors causing poor braking.
Use of low-grade friction blocks, such as silicide, the proportion of resin and other ingredients mixed properly, its low friction coefficient, the use was not good enough. Quality standards of the friction block should be soft with hard, so in the choice of accessories, do not think that the more the more hard-wear. In summary, for the disc brake vehicles, regardless of the vacuum brake booster brake booster double-pipe form, or ABS Braking systems, brake systems have not checked whether light, there is the so-called brake brake bad recession, do not take it lightly, brake pump pressure in normal circumstances, shall promptly repair brake block, do not consider that their thickness did not exceed the critical size is no problem, continue to use will cause damage to other components, impact Travel Security.
I am an expert from disposablemedicalsuppliers.com, while we provides the quality product, such as Disposable Anal Speculum , Disposable Vaginal Speculum, disposable medical exporter,and more.
Processing your request, Please wait....
