Author: Brother Car Picker
Questions from this issue:
1. There is a strange sound when stepping on the brakes?
2. Does the brake pedal become soft or hard?
3. The steering wheel shakes when the brakes are pressed?
4. When the brakes are stepped on, the car deviates?
First, there is a sharp metal friction sound when stepping on the brake;
There is a sharp metallic friction sound when pressing the brakes
If the brake pads have been worn or worn very thinly, then when you step on the brakes, the metal plates on the brake pads will rub against the brake discs, making a harsh friction sound, so this situation should be checked and replaced immediately!
The thickness of the brake pads is less than 3 to 5 mm
Check the brake pads yourself is actually very simple, you don't need to remove the tires, you can directly crouch down from between the spokes of the wheels to see the wear of the brake pads, or you can use your fingers to touch the brake pads, if you feel that the thickness of the brake pads is only 3 to 5 mm, you need to replace the brake pads; don't wait until the brake pads are completely worn before replacing, this is very dangerous!
"Alarm" for brake pads
Careful brother may find that some brake pads, will bring a small metal sheet, the role of this metal sheet, that is, when the brake pad is worn to a certain extent, the metal pad will rub with the brake disc, and then emit a harsh squeaking sound, which is also a reminder to the owner that the brake pad should be replaced!
It's also easy to change the brake pads yourself, I'm in episode 49 of "Brother In the Car" (99% of the repair shops will ignore this detail!). Do it yourself, avoid brake noise), there are detailed operation steps, and the brother who wants to do it himself can look back;
Second, when stepping on the brake, it feels that the brake pedal becomes soft;
The brake pedals become soft
There are 3 reasons for this:
1. The brake oil has not been replaced for a long time;
Brake oil absorbs moisture from the air
Because the brake oil is water absorbent, that is to say, it will absorb the moisture in the air, if the brake oil is not replaced for a long time, the boiling point will be reduced after the brake oil is sucked in too much water, which will lead to the use of the brake when we use the brakes every day, the brake oil is easy to boil, thus forming a gas in the closed oil channel;
Air can be compressed
But we all know that the gas can be compressed, so it will cause insufficient braking force, form a brake heat attenuation, affect the braking effect, so in order to ensure that the brake is not a problem, it is best to replace the brake oil every 2 to 3 years;
In fact, it is very simple to change the brake oil by yourself, I am in the 46th episode of the "Car Master Brother" program (to change the brake oil must be 2 people to cooperate?). Homemade tools for a person to get done in 5 minutes, save money car maintenance) has demonstrated the detailed operation methods, will definitely be able to help you;
2. Brake oil leakage;
The brake pads reduce the speed of the car by rubbing the brake discs
Because when we step on the brake, the brake master pump will push the brake oil to the brake sub-pump, and then the brake sub-pump will push the brake pad to rub against the brake disc, so as to slow down the vehicle, so as to achieve the effect of braking;
The brake sub-pump leaks oil
However, if the brake oil leaks at a connection of the brake sub-pump, or the seal, then the entire brake system is depressurized, which will cause insufficient pressure in the brake tubing, and the brake will become soft, or directly fail;
Brake tubing
In this case, the brake sub-pump of the 4 wheels should be checked, especially the brake hose and the sub-pump connection and the sub-pump piston part, if there is an oil stain or wet situation, you should immediately go to the repair shop to check the repair, because this may be the brake oil leak;
3. There is a problem with the sealing of the brake main pump itself;
The brake master pump seal is leaking oil
This needs to remove the entire brake general pump to check, so we are not very good at checking, we need to go to the repair shop to let the professional repair technician do it, if the back seal of the total pump is found to have brake oil stains, then directly replace a new brake master pump on it;
Third, the steering wheel shakes when pressing the brakes;
Brake disc deformation
This situation generally occurs more often in old cars! The main reason is because the brake disc wear is uneven, the brake disc changes, or the brake pad surface of the brake disc is uneven, so when stepping on the brake, the brake pad rubs against the uneven brake disc, and the steering wheel will shake;
Check the 4 brake discs
In this case, the brake discs and brake pads of the four wheels need to be checked, and if the surface of the brake discs and brake pads is found to be uneven, deformed or worn unevenly, they need to be replaced;
Fourth, when stepping on the brakes, the car deviates;
When braking, the car deviates
There are 2 reasons for this:
1. Partial grinding of brake pads;
The brake sub-pump guide pin rusts and freezes
This situation is generally caused by the rusting and jamming of the wheel brake sub-pump guide pin on a certain side, so it is best to maintain the guide pin of the brake sub-pump regularly to avoid this situation;
Of course, do-it-yourself maintenance of the brake sub-pump in episode 45 of "Brother Who Picks Up the Car" (high fuel consumption must be the engine's fault?). Maintain this part on time, the car is fuel-efficient and safe), there are detailed operation steps.
2. The brake sub-pump of a certain side of the wheel fails;
The brake sub-pump is damaged
This will directly lead to the side of the vehicle with brakes and no brakes on the side, so there will be a situation where the brakes are biased, and the solution is also very simple, directly replacing the broken brake pump can be;
I'm in Episode 48 of "Brother In the Car" (The brakes are too soft with poor braking force?) Replace the brake sub-pump by yourself, solve the problem in 10 minutes), there is a detailed replacement process, which can definitely help you;
Fifth, when stepping on the brake, the brake pedal is found to be hard;
The brake pedal stiffens
This situation may be a problem with the brake booster pump, because in fact, the little force we use our feet to step on the brake pedal is simply not enough to slow down, or even stop, a car that weighs several tons and is driving fast, which is the "credit" of the brake booster pump!
The vacuum booster pump is damaged
So if there is a problem with the brake booster pump, we will lose the brake help when we step on the pedal, and naturally we will feel that the brake pedal is very heavy, and when this happens, it is generally accompanied by a decrease in braking effect!
The first time to go to the maintenance
If you find this situation, you must check and repair it in time, the brake booster pump is broken, but it is a big problem related to driving safety! Don't be sloppy!
If this article can help you determine that there is such a problem with the brakes, then please forward it to your friends and help me like it! If you want to get more postures for self-care of the car, pay attention to the car master, update every Wednesday and Friday, we will see you in the next issue ~ bye-bye