The cantilever brake has the same operation as the mid-pullup brake. Because the pivot points are under the rim seated on the fork, this brake has a more advantageous lever ratio. After all, the brake pads are much closer to the pivot point than the connecting cable. The transmission ratio of the brake-arm is determined by the distance from the line of action of the connecting cable to the pivot point. (see Figure 34).
The main advantage of the cantilever brake is that there is sufficient space for the assembly of large tires and fenders. Cantilever brakes are therefore generally applied to mountain bikes and other sports bikes with wide tires.
The cantilever brake consists of the following components:
- The left and right brake-arm with internal hinge, and torsion spring.
The torsion springs ensure that the brake is released again after the braking. In the brake-arm can sit an adjustment screw to adjust the prestressing of the torsion spring.
- Two nocks on the front or rear fork for attachment of the left and right brake-arm.
The brake arms are screwed on the nocks.
Usually, the nock is provided with three holes in which the end of the torsion spring is incident.
The spring tension can be changed by placing the torsion spring of the pin in a different hole.
- The clamps for the brake pads.
- The brake pads. Brake pads for cantilever brakes have cylindrical ends so that they can be imputed to the rim.
When the brake pads wear, they can be put closer to the rim by the cylindrical end without having to change the position of the cable.
- The connecting cable. This is hooked with the cam behind the right-hand brake arm and clamped to the left brake arm.
The length of the transmission ratio of the brake.
- The cable clamp on the left brake arm
- The cable hook. Here, the inner cable is attached to, and then the hook is hooked behind the connecting cable.
- The cable made in the brake lever and where the cable hook is clamped to.
- The outer cable in the brake lever and a cam on the frame or the steering wheel.
For supporting outer cable of the brake must be between the ball head and the cup retaining ring are placed a ring with a cam.
The cam for rear cable typically located just below the saddle post lug.
- The brake lever.
The brake arms are at the top provided with a connecting cable which is drawn in the middle by the brake cable.
The angle at which the connection is strongly determines the transmission ratio. See picture 36 .
The greater the angle, the greater the gear ratio.
The connection cable is hooked behind a brake arm and bolted to the other brake arm.
The length of the hook is easy to adjust and thereby the corner.
The brake cable engages in the middle with a hook.
At the seatstays the ridge is usually placed just below the zadellug.
The brake hooves can be centered simply by sliding the hook on the connecting cable.
If this fails, the brake must be centered by adjusting the spring tension.
By adjusting the cable the brake pads are placed closer to or further from the rim. See picture 37 .
However, the angle of the connecting cable will also change.
If it is too sharp, the brake pads can be brought better closer to the rim by making the connection cable shorter.
When the brake pads are worn and the cyclist is satisfied with the braking, the brake pads can closer be put to the rim to loosen them and slide towards the rim. See Figure 38 and 39 for further adjustment instructions.
The cantilever brake is installed as follows:
- Lubricate the cam with an assembly grease.
- Screw the brake arms on the cams. To get the proper spring tension should the brake arms can rotate about a 90 ° angle.
- Adjust the brake pads.
- Place a clamp on the brake arms so that the pads are properly pressed against the rim.
- Install the connecting cable and secure it so that the angle is correct. Usually, an angle of between 90 ° and 120 °.
- Fix the brake cable. Turn hereby set screws so that it is possible to loosen the brake.
- Pinch with full force into the brake lever to check that all cables are secure
Release the clamp ..
- Turn the cable by t squeezing 5 to 10 times powerful in the brake.
- Adjust the brake.
If the spring tension is not good then it can be adjusted by turning the adjustment screws in the brake arms.
The attachment of the cable goes on cantilever brakes of Shimano in a slightly different manner. The brake cable is pulled through the ends of the connecting cable and fastened to the other brake arm. The angle of the connection is more or less fixed this. The advantage of this is that the brake is set in the manner proposed by the manufacturer. With conventional cantilever brakes the connection will be into the tire if the brake cable breaks. The brakes are then applied and the wheel lock or one flies over. In order to avoid this, a cable can be mounted to the front wheel catcher. Upon confirmation as Shimano which the wheel is used is not blocked because the connection between the two brake arms broken at break of the brake cable.
If wear the pads of a cantilever brake, they are increasingly lower on the rim due to the greater angular rotation of the brake arms. During excessive wear, there is a risk that they strike in the spokes. The pads newly installed, therefore the highest possible position against the rim.
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