Removing the Piston
Here is the setup to remove the piston from one side of the caliper.
- The pistons are removed and replaced one side at a time.
- The opposing piston is held in place by a C-clamp.
- To prevent damage to the piston a shop rag or block of wood is
placed in the opening.
- Air pressure was used to blow out the cylinder. This one came loose
with 120 psi. The nossle of the air hose had a rubber tip which sealed
on the hydraulic input fitting without bleeding. If the air pressure
did not work because the piston is frozen in the caliper, Dave usually
re-attaches the caliper to the car and uses the master cylinder pressure
to pop the piston free.
- There is still hydraulic fluid in the caliper, so it can make a mess
when the piston comes clear. The mess was contained by draping some
more shop rags over the assembly before applying the air pressure.
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