What problems should be paid attention to in the brake cylinder?

Remove the sub-pump screw without removing the bracket, 14 Torx wrench. The sub-pump was held too tightly. I used a big screwdriver to pry the sub-pump from both sides of the bracket to remove it. First, use carburetor cleaner to clear the surface, use a small flat-blade screwdriver to gently pry up the rubber holster on it, cooperate with tweezers, and check whether the piston is rusted or corroded. If you find some white dirt, spray it with carburetor cleaner, and then spray it with rust remover. Return the rubber sleeve back to its original shape. It doesn't look like a problem here. The screwdrivers and tweezers should not be too sharp, use round tips, and don't break the foreskin.
I installed the sub-cylinder, stepped on the parking brake, and felt that the cable did not respond. I guess that is the fault here. The cylinder is mounted on the cylinder bracket, which makes it easy to remove the spring on the handbrake side. Use a big screwdriver to pick up the return spring, gently send it out, and the spring is taken off.
I did this before, I first cleaned the surface with carburetor cleaner, and then used a wrench to hold it, so I installed it. When installing, the piston must be pushed back to the top, or it will not be installed.
When I opened the foreskin, there was a bear inside. Normally, it should be shiny, and there is a little grease around it. The piston of the sub-pump accidentally came out. The foreskin was also bursting well, so I found a thin thread to tie it up. The piston goes in clockwise and goes out counterclockwise. Screw it in until it can't be screwed. At this angle, there is a groove that just catches the small protrusion of the brake pad. In the picture above, the foreskin is broken and the piston is easily corroded. Find a condom and see if it fits. The sub-cylinder is limited by brake lines and brake hoses, and the construction is a little awkward. When installing, you have to push the brake cable, the brake cable is too hard. The brake line is not easy to remove, so you have to rotate and use two small screwdrivers to hold the two spring pieces with colleagues.
Open this rubber cover, referred to as the foreskin, the gap above is the rusted place, the inside is the shaft, the outside is the cover, spray the rust-removing bubble, shake it back and forth with a wrench, it is too strong at first, slowly All right. I made a mistake earlier. I shook it in my hand without installing the sub-pump. At first, I remembered to shake the piston a few times, but then I forgot. When the hand felt useless resistance, I found that the piston came out. cut. There is no way to send the piston back, let the rear pump install the bracket and continue to shake, but the brake hose is getting air! ! ! Only when it is taken off is it convenient to turn the foreskin up and spray the rust remover.
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