Mountain bikes crash when you grab the brakes and they crash with a click.

1. Analysis of possible causes.

1. It is the lack of necessary maintenance of the brake system, there are too many impurities in the brake master cylinder, the sealing is not tight, the vacuum booster pump fails, the brake oil is too dirty or the air resistance occurs after the mixing of several brake oils after heating, the brake master cylinder or sub-cylinder leaks, and the air leakage of the gas tank or pipeline interface;

2. It is due to improper operation that causes the failure of the parts;

3. Due to serious overload, under the action of gravitational acceleration, the inertia of vehicle movement is increased, which directly leads to brake failure.

Second, the treatment method.

1. Control the direction according to the road conditions and speed, disengage the high-speed gear, and at the same time quickly blast the empty fuel and shift the high-speed gear into the low-speed gear. In this way, the engine will have a lot of traction resistance and the speed of the vehicle will be reduced rapidly. In addition, the handbrake should be used in conjunction with the low-speed gear shift, but it should be noted that the handbrake should not be tightened or pulled too slowly.

If it is pulled too tightly, it is easy to make the brake disc "lock", and it is likely to damage the transmission parts and lose the braking ability; If it is pulled too slowly, the brake disc will wear and ablate and lose its braking effect.

2. Use the bumper, carriage and other rigid parts of the car to rub and collide with natural obstacles (rocks, trees or soil slopes) on the side of the road to achieve the purpose of forcibly stopping and getting out of danger, and reduce the accident loss as much as possible.

3. If the brake fails when going uphill, it should be reduced to medium and low gear in time to maintain sufficient power to drive uphill to the top of the slope and stop. If you need to park on a half-slope, you should keep the forward low gear, tighten the hand brake, and the personnel with the vehicle should use stones, skids and other objects to jam the wheels in time. If there is a backward slippage, the rear of the car should face the hillside or the safety side, and the headlights and emergency lights should be turned on to attract the attention of the vehicles in front and behind.

4. When the downhill brake fails and the speed of the vehicle cannot be controlled by the mechanism of the vehicle itself, the driver should decisively use natural obstacles, such as rocks and trees on the side of the road, to cause resistance to the car. If you can't find a suitable terrain or object to use for a while, in an emergency, you can move one side of the car closer to the side of the mountain, and gradually reduce the speed of the vehicle by rubbing to increase the resistance.

5. The vehicle should step on the brakes when going down a long slope or a steep slope, regardless of whether there is a situation or not. It can not only test the performance of the brakes, but also buy time to control the speed of the vehicle when the brakes are found to be out of order, also known as predictive braking.

3. Preventive measures.

Do not ignore the daily maintenance of the brake system, in order to prevent the occurrence of brake failure, please maintain the brake system in time, regular maintenance and overhaul is essential, for the safety of life, you must not ignore the regular maintenance.

Note: Check whether the brake shoes are in good condition, and do not overuse the brakes, hang the low gear when going downhill, use the brake of the engine to let the car drive, supplemented by the foot brake; Avoid severe overloading to prevent brake failure.

As soon as the mountain bike brakes are clammed, it fails, probably due to the following reasons:

1.Lack of necessary maintenance of the brake system, such as too many impurities in the brake master cylinder, poor sealing, failure of the vacuum booster pump, excessive dirt of brake fluid or air resistance after mixing several brake fluids after heating, oil leakage from the brake master cylinder or sub-cylinder, air leakage from the air tank or pipeline interface.

2.Improper operation leads to the failure of the mechanism.

3.Severe overload, under the action of gravitational acceleration, increases the inertia of vehicle motion, directly leading to brake failure.

Pinch the brake click, brake failure, to make the piece no longer clamped, the reason is the tower spring stuck dislocation, maintenance is very simple, disassemble the lock wire that pull rod screw, you will see the tower torsion spring, as long as the tower spring card is not broken, reload the limit hole, cover the connecting rod locking screw is OK.

Look at the brake pads.

The screws are not tightened in that place.

Remove dust from the brakes and inspect the individual parts for damage.

There are the following solutions to the abnormal noise when the disc brake of the mountain bike brakes

1. Disc brake deformation: similar to the long-distance downhill in summer, the disc brake deformation is caused by high temperature and overheating for a long time. Symptoms include the platter rubbing against the incoming disc and making a noise when it rotates.

Solution: Use a platter wrench to gently calibrate the platter if there is a friction somewhere between the wrench and the platter. The disc is seriously deformed and needs to be replaced in time.

2. The caliper is not debugged to the best state: at present, the mainstream fixing method of the mountain bike disc brake seat is the A-pillar direct installation, but the screw hole is easy to slip. Some of them are installed with the old-fashioned B-pillar adapter seat, so you don't need to worry about slipping wire, but the installation position of the adapter is troublesome.

If the clamp is not installed in place, it will directly cause the disc to rub against the incoming plate.

Solution: Use a 5mm Allen wrench to loosen the clamp fastening screws (remember not to loosen too much, just keep the clamp moving), then fine-tune the clamp to keep the same distance between the incoming pieces as much as possible, and then tighten the screws and turn the wheel. If you find that the platter is still rubbing, repeat the previous steps.

3. The incoming piece is locked and does not rebound: when disassembling the wheel, the disc block is mistakenly not put back in. If you accidentally pinch the brake at this time, it will directly cause the incoming piece to lock up and not rebound.

Solution: When removing the wheel, you need to put the disc stop back in time to prevent the incoming disc from locking.

There is an abnormal sound when the mountain bike brakes, the general situation is to rub the butterfly, the brake adjustment can be solved, or it may be caused by the serious wear and elasticity of the order piece, so it has to be replaced with a new one.

Reasons for the clicking sound when applying the brakes:

1. The reason for the squeak when braking may be that the brake pads are worn and need to be replaced immediately. Most of the braking sounds are when the vehicle is driving, and the braking system will emit a sharp metal friction sound, which often appears after rain;

2. The braking system is a maintenance item that many car owners will basically ignore, and the maintenance of the braking system is not only to replace the brake oil, but also to disassemble the brake cylinder, remove and lubricate the oil to avoid the brake cylinder"Guide pins"Brake cylinders are stuck due to excessive dirt, lack of lubrication and excessive wear. Most of them should be maintained once when changing the brake fluid or changing the brake pads;

3. The brake disc is seriously worn. Severe wear of the brake disc can create a rather deep groove on the disc, and the friction of the brake disc against the edge of the groove can cause a rattle. If the groove is not deep, polish the edge of the brake pad; If the grooves are very deep, the brake disc needs to be replaced.

The screeching sound of the mountain bike oil disc when braking before use is caused by the oil stain of the disc or the oil stained by the plate.

Solution: 1. Check the oil pipe oil leakage at the front brake caliper, and replace the oil pipe or sealing element in time if there is any leakage.

2. If there is no leakage or after replacing the oil pipe and sealing elements, you can wipe the disc with a clean cotton cloth dipped in alcohol, rinse it with alcohol, and if necessary, you can remove the order sheet and clean it thoroughly.

3. After cleaning with alcohol, wait for 3-5 minutes for the alcohol to volatilize and return to eliminate the harsh sound.

The pull of the brake cable causes the brake pads in the caliper to rub against and clamp the disc, creating a braking effect.

Hydraulic type, with oil as the medium, pulling the brake lever is to make the piston inside to compress the oil, and the pressure is straight from the oil pipe to the caliper, so as to push the piston in the caliper and drive the brake pad to clamp the disc. Mechanical disc brakes have the convenience of compatibility, and the general V-shaped brake lever can be universal.

The causes of disc whistling are generally as follows: the disc or the disc is sticky with dirt such as water or mud, the surface of the disc will produce uneven impurities, and when braked, the disc will vibrate irregularly and make a sharp noise, but it generally has little impact on performance and can be ignored.

Refer to the above; Encyclopedia - Disc brakes.

Summary. There is this sound when the brakes are applied, and it feels like this sound is in the position of the brake pedal. This is normal.

This is the brake control switch on the brake pedal. This sound will appear when the brakes are pressed, this is a normal phenomenon, and there is no problem.

Hello, I have seen your inquiry, please wait for a moment and answer it for you immediately.

Hello! The brake pads that have just been changed will tick when you step on the brakes now, and the brakes will tick when you release them.

There is this sound when the brakes are applied, and it feels like this sound is a bump in the position of the brake pedal. This is normal. This is the brake control switch on the pedal of the brake hall.

This sound will appear when you are working on the brakes noisily, this is a normal phenomenon and there is no problem.

This has little to do with the replacement of the brake pads, mainly when the brake switch on the brake pedal is working, this kind of thing will occur.

I didn't find it before.

This has nothing to do with the replacement of the brake pads, this is the sound of the brake control opening high Yuguan to check the sound of Changlai. Now it shows that this brake control switch is worn and dry friction inside.

Need to be dealt with?

You don't have to deal with this, it doesn't have any effect, it's just this sound.

It won't affect the driving of the car.

No, it won't. I still don't feel at ease, I went to the repair shop where I changed the brake pads today, and the master didn't know what the reason was.

It doesn't matter, just open it normally.