What Are The Possible Aauses Of Abnormal Brakes? - Brakes

What Are The Possible Aauses Of Abnormal Brakes?

  1. New car break-in

A new car or a newly replaced brake disc will have a break-in period. During the break-in period, some strange noises will appear, which can be eliminated after running for hundreds of kilometers.

  1. ABS system starts normally

When the brakes are suddenly applied, there will be a continuous beeping sound and sometimes a bullet. This indicates that the ABS system has started, which is a normal sound. You can apply the brakes at this time, but only for vehicles equipped with ABS system.

  1. Hard metal spots on the brake pads

There are some tiny metal particles in the brake pads. When you apply the brakes, it will make a sharp and harsh sound. This problem can be used to step on the brakes or remove the brake pads and refinish them. It can also be replaced with better brake pads.

  1. Brake pads are badly worn and the alarm is activated

Brake pads usually have alarm components. When the brake pads are worn to the limit, the friction between the brake pads and the brake disc will produce a sharp metal friction. In this case, the brake pads must be replaced in time to avoid scratching the brake discs and brakes. Ineffective.

  1. Severe wear of brake discs

Brake disc wear will form deep grooves around the brake disc, and the friction between the brake disc and the edge of the grooves will produce a strange sound. If the groove is not very deep, you can solve this problem by grinding the edge of the brake pad to avoid the brake pad rubbing against the edge of the groove. If the groove is already very deep, it is recommended to replace the brake disc. It is generally recommended to replace the brake discs and pads twice.

  1. Brake pad assembly problem

Try to reinstall the brake pads and apply grease or special lubricant to the brake pads and calipers. It is also possible that the brake pads were installed backwards and reassembled. This is especially true for owners of roadside stalls and brake pad replacements, etc.

Brake Pad Knowledge and Precautions

Brake pad replacement

Since each owner has different driving habits and different braking frequency, the brake pad replacement time is not uniform. During a routine inspection, check only the wear level of the brake pads. If they reach a critical point, they should be replaced immediately.

Brake pad replacement for disc brakes is simpler. By removing the tire and loosening the caliper screw, the brake pads can be removed and replaced with new ones without any adjustment.

When replacing brake pads on drum brakes, the wheels need to be removed and then the drums need to be removed before the pads can be replaced. Pay attention to the overlap between the new brake pads and the brake drum, the overlap is not good, sometimes it needs to be polished; when assembling, adjust the gap between the brake pads and the brake drum.

Introduction to brake pads: wear and tear

Brake pads usually consist of a steel plate, an adhesive insulating layer and a friction block. The steel plate is painted to prevent rust. an SMT-4 oven temperature tracker is used to detect the temperature distribution during the coating process to ensure quality. Brake pads are an important part of a car’s braking system and are therefore essential for safe driving.

Generally, brake pads need to be replaced if you have driven more than 80,000 km. However, if you hear the wheels rubbing, you should replace the brake pads no matter how many miles you have driven. Under normal driving conditions, check the brake shoes every 5,000 km, not only for remaining thickness, but also for wear on the brake shoes, whether the wear is the same on both sides and whether the return position is free.

  1. Original brake pads need to meet which nine technical indicators at the same time?

A: stable friction coefficient, long service life, low noise probability, low wear of brake disc, stable high temperature braking capacity, low thermal expansion, qualified compression ratio, low ash, environmentally friendly materials.

  1. Is the coefficient of friction of the brake pad as large as possible?

No. The friction coefficient of brake pads is designed according to the weight inertia of the car itself. It takes into account several technical indicators such as speed, inertia, braking distance and comfort. The general coefficient of friction on the market is between 0.34 and 0.42. Increasing the coefficient of friction is simple, adding abrasives is sufficient. Automobile manufacturers judge the quality of brake pads by how stable the coefficient of friction is under various extreme road conditions, such as spills, winding mountain roads and constant sudden braking.

  1. How many types of brake pads are available in the market? What are their characteristics?

In total, there are three formulation systems. One is the low-metal formula, with high friction coefficient, short life span, fast disc wear, but super sensitive brake; one is the more common semi-metal formula, with strong versatility, moderate friction coefficient, normal life span up to 30,000 – 70,000. km, less gray, and small disc wear. Another is the ceramic formula, with high temperature braking ability, continuous emergency braking, downhill braking and other continuous high temperature conditions. Friction coefficient is stable, no dust, long life, almost wear on the disk. Due to its environmental characteristics, ceramic formula has also become the mainstream of the later market development.

  1. Which one of the three formulas is better?

As far as the performance of brake pad safety brakes is concerned, all three formulas are good formulas. Ceramics are superior to metals in terms of safety, social development, economy and environmental protection.

  1. How to identify these three formulas?

As the name suggests, semi-metal is about containing half of the metal fiber. The low metal contains less metal fibers and the structure is coarser. The ceramic formula is fine and the surface of the friction material has many fine cracks.

How to Replace the Brake Pads

  1. Loosen the hand brake and loosen the wheel screws that need to be replaced (pay attention to loosen them and do not unscrew them completely).Use jacks to top the car. Then remove the tire. Before moving the brakes, it is best to spray a spray on the brake system with special brake fluid to prevent powder from entering the respiratory tract and affecting health.
  2. Remove the brake caliper screws (for some cars, simply unscrew one of them and loosen the other)
  3. Hang the brake caliper with a rope to avoid damage to the brake lines. Then remove the old brake pads.
  4. Push back the brake piston with a C-clamp. (Please note that before this step, lift the engine cover and unscrew the cover of the brake fluid tank, because the fluid level of the brake fluid will rise when the top brake piston is closed). Install new brake pads.
  5. Put the brake caliper back and tighten the caliper screw to the required torque. Put the tire back and tighten the hub screw slightly.
  6. Lower the jack and fully tighten the hub screws.
  7. Because in the process of changing the brake pads, we put the brake piston to the innermost position and it will be very empty when we start to brake. Just step on it a few times.

How Long Does the Brake Pad Change?

  1. For traffic mileage, we only need to consider whether to replace the brake pad when driving 10000-30000 km.

Under normal circumstances, the front brake pad will be heavier than the rear brake pad. You can check the front brakes during the inspection.The situation of the film. The specific number of kilometers traveled to replace the brake pads varies from person to person, depending on the truck, depending on the road conditions.

  1. There will be a brake indicator on the instrument panel.

The brake warning light is on, indicating that the brake pads are useless. Therefore, check the brake in advance and replace it in advance. Don’t replace it when the warning light is on.

  1. Thickness, check the brake pads should not be replaced, to see the thickness of the brake pads.

We can let the maintenance master look at the thickness of the brake pads, their judgment is accurate and professional. a new brake pad thickness is generally about 15mm, with the use of continuous friction will gradually thinning. When the thickness of the brake pad was visually observed, it was only about 1/3 of the original thickness (about 5mm). Owners will increase the frequency of self-tests and are ready to change.

  1. Brake sound.

When we are driving, if we hear the sound of braking is different from that of Ping’an, the sound is abnormal and harsh. Then it is necessary to check the brake. Generally, there will be abnormal sound on the brake pads.

  1. Braking reflects that if we drive for a long time, we will be very familiar with the performance and state of the truck.

When we feel that the braking distance is longer and the brakes are not sensitive, we must go to the regular 4s shop for inspection because the brakes are related to driving safety. Must pay attention to it.

  1. The choice of the brand of brake pads is also very important.

Choose the brake pads produced by regular manufacturers. Don’t plan to buy cheap brake pads. It’s best to choose the original brake pads provided by truck manufacturers.

Abstract: the brake pad is the most critical part of automobile braking, and the braking effect is mostly reflected by the brake pad. In general, the friction between the brake pad and the brake disc is promoted by hydraulic transmission and the movement of the brake caliper, so as to achieve the effect of deceleration and braking. Once you feel that the braking effect is not good, you should first think about whether it is related to the brake pads.

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