Reply to "Rebuilding stock front calipers"

panteradougMember

If you can't break the pistons free on the car then you won't blow them apart with air at 150 psi.

Any master cylinder is going to make at least 600psi.

I used to buy Liquid Wrench in gallons for stuff like this. The most you can do is vat soak them for a week or so, then try to move the pistons again.

I'll predict that they are so corroded that they will crack through the flats rather then break free an move.

If you can find a machine shop with a real hot tank, bring them there. That stuff takes the rust right off of the iron blocks and head but it is caustic as hell and you want the shop to get the pistons out.

Now if the car had Dot 5 silicone fluid in it, this would likely not have happened at all.

2/28/1312:56 PM

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