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Motorcycle disc brake system maintenance and maintenance knowledge

Motorcycle braking system is very important for us to drive motorcycles, a good braking system can escort us. A motorcycle without brakes cannot be parked safely.

The full name of the disc brake is the disc brake, which is composed of a brake disc connected to the wheel and a brake caliper on the edge of the disc.


Motorcycle disc brake system maintenance and maintenance knowledge


Disc brakes are also known as disc brakes. The disc brakes push the brake calipers through the hydraulic pump and hold the brakes tightly. In order to improve the braking force, according to the F=P*S formula, the method of increasing the braking area is generally adopted to increase the braking force. Contact surfaces. It is also possible to lengthen the brake lever. There are also ways to increase the pressure by amplifying the pressure of the hydraulic pump and increase the braking force by increasing the diameter of the brake disc to increase the braking torque.


How to vent air from disc brakes

  • How to exhaust air and refuel: add enough oil to the oil storage cup for braking night, and repeatedly grab the brake handle (5-6) times. Pinch it to the end and don’t let go, then loosen the oil drain bolt on the brake (remember to open the small rubber cap), let the brake fluid and air flow out, pay attention to the liquid that flows out, and tighten the bolt after feeling that there are no air bubbles, and then hold it again and again Brake the handle until it feels firm and don’t let go.


Motorcycle disc brake system maintenance and maintenance knowledge


Loosen the oil drain bolt with the other hand, let the oil and air spray out together, then tighten the oil drain bolt, then put the hand holding the brake handle (the order cannot be reversed), repeat several times until the air is exhausted (The air is exhausted when the brake fluid comes out with pressure and no broken air bubbles).

Note: It should be noted that the brake fluid level in the oil reservoir cup cannot be too low.


The brake noise. There is also a slight friction sound in the normal hydraulic disc brake system, but if the sound is relatively loud, it means there is a fault, which is usually caused by the following reasons

1. The brake pads are seriously worn, the friction pads have been worn out, and the “rubbing” and “rubbing” sound will be produced by the friction between the metal plate and the brake disc. Brake pads should be replaced.

2. The brake disc is uneven, the brake disc has been hit, and there is a warped part. During the rotation process, it will swing and rub the brake pads, resulting in noise. It can be confirmed by rotating the wheel to observe the swing of the brake disc. If the swing exceeds 0.5mm, the brake disc should be replaced.

3. The missing or no elasticity of the shrapnel will cause the brake pads to collide back and forth in the slot to generate noise. Shrapnel can be supplemented or trimmed for processing.

4. If the brake does not return, there will be a large friction sound. You can install the brake not to return to deal with the fault. Dissipate heat and optimize thermal decay.


Motorcycle disc brake system maintenance and maintenance knowledge


The brake does not return. After the brake levers are released, turning the wheel is still difficult due to the following reasons

1. The plunger of the upper pump does not return, which is caused by the over-tightening of the sealing ring or the corrosion of the plunger and the plunger hole. After the plunger is pressed and released, it cannot be ejected or the ejection is too slow. The upper pump assembly should be replaced.

2. The junction of the brake handle and the plunger is too tight, the plunger cannot be completely returned, the liquid cannot return, and it is always in the braking state, usually caused by the inappropriate replacement of the brake handle, and the junction of the brake handle and the plunger can be polished a little.

3. The brake oil pipe is blocked, the liquid return is blocked or the piston of the lower pump is severely corroded, and it is not suitable to return to the position due to excessive tightening. The brake oil pipe can be replaced or the lower pump piston can be removed for lubrication and cleaning.

4. The lower pump body and the pump body bracket are rusted, and the pump body cannot move axially along the bracket. Under normal circumstances, there is a slight amount of movement between the pump body and the stent. In this case, the pump body and the bracket can be decomposed and then derusted and lubricated.

5. The rear wheel locks up. In this case, you need to open the vent hole of the lower pump to see the outflow of oil. If the oil is sprayed out after opening, and the rear wheel becomes lighter at the same time, it means that it is a pressure problem, and the fault may occur in the upper pump and the oil pipe; If the oil slowly flows out after opening, and the rear wheel is still very heavy, it means that it is a mechanical problem with the lower pump.

6. Brakes not working or no brakes. The reason for this failure is that the amount of brake fluid is insufficient or there is gas in the pump. It is necessary to add brake fluid or bleed air in an appropriate amount according to the specific reasons. Air bubbles emerge from the vent hole, then tighten the vent screw first, then loosen the brake handle, and repeat until there are no air bubbles.


Motorcycle disc brake system maintenance and maintenance knowledge


It should be noted that deflation also needs to be done at the screw where the upper pump and the brake hose are connected. In individual cases, the mixed and added brake fluid will generate gas and compounds during the vehicle placement process, and the compounds will easily block the small oil inlet holes in the oil pool.


At last

Disc brakes are now the most common thing we see and generally have on our cars. Most motorcycles have disc brakes. The working principle of the disc brake system is to install a disc on the hub that rotates synchronously with the wheel, and connect the front fork with the wheel. A caliper is installed on the frame, and then the disc is clamped through the brake block in the caliper to achieve the purpose of braking.

Disc brakes are sometimes called disc brakes, which are divided into two types: ordinary disc brakes and ventilated disc brakes. Ventilated disc brakes drill many circular ventilation holes on the disc surface, or cut ventilation slots or prefabricated rectangular ventilation holes on the end face of the disc. Ventilated disc brakes take advantage of air flow, and their cooling and heating effects are better than ordinary disc brakes.

The main advantage of disc brakes is that they can brake quickly at high speed, the heat dissipation effect is better than that of drum brakes, the constancy of braking efficiency is good, and it is easy to install advanced electronic equipment like ABS.


Motorcycle disc brake system maintenance and maintenance knowledge


Use metal blocks (discs) instead of drums. There are flat brake shoes on both sides of the brake disc. When the oil pressure from the brake master cylinder is sent to the sub-cylinder, the brake shoes are clamped to the brake disc to achieve tight braking. The effect is now widely used in the front wheel, and some slightly better rear wheels are also equipped with disc brakes, which have the advantages of sensitive action, good heat dissipation, no need to adjust the brake clearance, and easy maintenance.