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The adjustment method of the front brake of ordinary bicycle brake parts is: use a wrench to loosen the brake nut, lift the front brake fork and the front pull tube up with the left hand, so that the distance between the brake skin and the rim is only 1 mm, and then use the right hand to adjust the front brake. Pull down the short tie rod on the handlebar to make the short tie rod and the front pull tube in a straight line, tighten the brake nut tightly, and release the left hand, the brake shoe will drop by 1-2 mm, so that the brake shoe is about 3 mm away from the rim.
The adjustment method of the ordinary rear brake is: first loosen the clamping nut under the frame, then tighten the adjusting nut, adjust the brake shoe to about 3 mm from the rim, then tighten the clamping nut, if the brake shoe is too close to the rim , the adjustment direction is opposite. If the brake plate, short tie rod, rear pull tube and other parts are loose, or the opening angle of the rear crank spring is too large, the brake screw can be loosened when the elasticity is small, and the rear pull tube can be lifted with the left hand to make the brake shoe face the rim Approach, and then use the right hand to pull down the short lever of the handlebar, so that the short lever and the rear pull tube are in a straight line, and then tighten the brake screw. The nut on the tie rod joint, pull the rear crank forward, so that the rear brake skin and the rear brake fork move forward, at the same time press the rear crank spring, and finally tighten the nut on the long tie rod joint.
The adjustment methods of the front and rear clamp brakes are the same. First loosen the lock nut on the adjusting screw with a wrench, then loosen the adjusting screw counterclockwise by hand, and tighten the lock nut when the brake shoe is adjusted to 2-3 mm from the rim. If the brake shoe is too close to the rim, turn the adjusting screw clockwise.
The adjustment method of the front brake is to properly tighten the adjustment seat at the lower end of the front pull rod, so that the brake pad is close to the brake box; on the contrary, the brake pad leaves the brake box. The adjustment method of the rear brake is to twist the adjusting seat of the rear tie rod forward to make the brake pad approach the brake box; on the contrary, make the brake pad leave the brake box.
When the bicycle brake accessories are braked, the contact area between the brake pad and the rim on one side is large, and the contact area between the brake pad and the rim on the other side is small. The reason for this failure is:
(1) If the front or rear wheels are not installed correctly, the front or rear wheels should be installed so that the distance between the front rim and the left and right front fork legs is equal, so that the rear rim is made. The distance between the left and right flat fork legs is equal.
(2) The rim has axial flutter, and the axial flutter of the rim should be eliminated.
(3) If the gate is biased, the screws on the splint should be loosened, the gate should be installed, and the screws should be tightened.
(4) If the brake fork is deformed, use wire pliers to clamp the turn of the brake fork to correct the deformed brake fork. If the brake skin is outward, the brake fork can be pulled inward; otherwise, it can be pulled outward, and then adjust the position of the brake plate to make the left and right brake skins symmetrical.
The reasons for this failure and how to overcome it are:
(1) The brake fork is not installed correctly. When installing the front brake fork, loosen the brake screw and the screw for tightening the gate, install the positive gate and the front brake fork, and then tighten the screws. When installing the rear brake fork, loosen the splint screw and install the positive brake fork. If it still does not work, loosen the nut on the rear crank splint, turn the rear crank splint, and install the rear crank crank.
(2) If the brake fork is deformed, the brake fork should be corrected. If the brake shoe on the right side of the brake fork of the bicycle brake accessory touches the rim first, the straight part of the brake shoe can be pulled down to make the brake shoe leave the rim, or the left straight part can be moved upward. Pull to make the brake shoe close to the rim; otherwise, pull in the opposite direction.