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Installation of the piston and related parts.

Install Spring parts first


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.

 

Lube and Install piston


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.

 

Snap ring should be reinstalled after piston


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.



 Install dust seal Correctly installed piston seal

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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