940 Front Brake Caliper Bolts Tight

I could use some helpful advice on removing the front brake caliper bolts
from a 940. My goal is to relpace the well-worn front brake rotors, and to
do so requires removal of the caliper, which in turn requires the removal of
the caliper bolts.

I tried WD-40 and another type of penetrating oil, and yet they will not
budge. Is there a useful trick for removing them that I am not aware of? Any
helpful suggestions appreciated.

GMan

 

The bolts on my '93 960 were also quite tight even though it had been
about one year since they were last removed (Girling calipers, I
think). I have to assume that you are also replacing the pads. WD40 is
not going to do it. You need to get a penetrant oil (like "Liquid
Wrench") and apply it about every ten or fifteen minutes for a couple
of hours. Then take a hammer and tappity tap tap like playing drums on
the bolt head about every half hour during this process. The
vibrations will help break up the rust and corrosion. Then try
applying a slowly increasing torque to the bolt. Also try tightening
it JUST A BIT and then loosening, and repeating that over and over.
Then start the process over again.

When putting it back together, clean the threads of the caliper and
clean (or replace) the bolts, and use some quality anti-seize on the
threads. Of course, it goes without saying, that anti-seize on the
pads or rotors is counterproductive.
from Randy & Valerie
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\__/olvo
1993 960 Estate

 

The Haynes manual for the 940 says to always fit new caliper bolts if
you remove the caliper for any reason.

 

A big breaker bar and some new bolts!
My 700s had 'lock-tite' on them.
They are supposed to be hard to break loose.
Bill @ Home in Wisconsin, USA
Maroon 1989 760 Turbo wagon! w/140k miles ;-}
Black! 1989 780 Turbo Coupe w/146k miles 8-}