Quote:
Originally Posted by DeliveryValve
If you get one out and the other is stuck, you can pop out the rubber dust cover from the cylinder you removed and place the piston back in. Hold that piston down (easier with an assistant) and shoot compressed air again. It should pop out.
If not then, splitting the caliper maybe in order. I didn’t need to do that this time. I also prefer not to because you’ll need to replace and source these o-ring that does not come in the repair kit.
Once split, you can use a pliers or vice grips to wiggle the piston out or shoot more compress air into the fluid holes at the split. (again be careful the piston will shoot out)
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You've got some problems with this procedure.
Firstly, if you're going to get into the fine art of rebuilding a caliper, odds are that one of the pistons is frozen quite solid in the bore. You're not getting it out with 100 psi.
Furthermore, when you apply 100 psi, the opposite piston immediately and promptly eject itself from the bore, leaving you with a stuck piston and an open hydraulic system.
The thing to do is to ascertain your condition prior to disengaging the free piston. Apply about 30 psi.........if one piston moves and the other does not............STOP.
Get a C-clamp and clamp the free piston so that it won't move.
Install the caliper back on the vehicle and connect the brake hose.
Press on the pedal and apply full hydraulic pressure to the stuck piston. This will amount to over 500 psi and the piston will eject itself.
Now, you've got the issue of an open bore and one engaged piston.
You'll need a sheet of rubber and a wooden block that covers the bore. Clamp the block against the rubber.........over the bore.
Now, use your air pressure...........40 psi will do it........to free the remaining piston.
DO NOT separate the caliper halves........