Installation of the piston and related parts.
First install the spring and end seal in the same direction the old one was removed. Be sure to use a good amount of silicone spray lube on the parts prier to installation.
Next install the piston in the same direction as the old one was removed. Again use plenty of silicon lube on the parts. You will also have to keep your thumb on the end of the piston and keep it pushed in for the installation of the washer and snap ring. This part can be a little tricky so plan how you will do it before trying so you do not release the piston and let it fly out or drop the entire master cylinder and damage it.
Now the picture shows the original snap ring before removal, but we are using the picture to show what the new snap ring placement will be after it is installed. There is a groove the snap ring fits in so you will want to make sure it is fully seated into the groove.
The last part of the installation is the end dust seal. The dust seal typically just slips in and you work it into the inner groove inside the bore and there will be a groove in the piston itself for the other end. After installation it will look like the second picture and should not be wrinkled. The use of silicone spray for this step is not necessary. On some models there will be a basic cir-clip (circle clip) that holds the large end into the bore. If so install the cir-clip last and take care not to puncture the dust seal.
Now that we are done with the inner workings of the master cylinder, we will go over the basic removal and installation of the reservoir.
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