could be a caliper, but probably a hose coming from the caliper that is
messed up inside and holding the pressure on the one wheel....the hose
is acting like a one way valve when it breaks inside and lets fluid go
one way and not back in... kinda like a check valve??????
find out what wheel is doing this, jack up that side and try to spin the
wheel.. if it done move then you take off the tire and crack open the
bleeder valve and let the fluid drain out and then spin the wheel.. if
it moves then that is the wheel.. also check the caliper pins to see if
the caliper can slide back and forth like it should...
by front wheel brakes, do you mean both front wheels, or just one side?
If both, it is likely that the master cylinder has seized. If this is the
case, you can normally get away by unbolting the master cylinder from the
brake servo and brake pipes. If it has sezied it is likely the back of the
master cylinder will be rusty, and preventing the plunger from returning
under spring presure. You can normally get away with cleaning the rust out
and putting some silicon grease (normal grease will swell the seals and
cause them to fail) in the back.
If only one side has seized it could be any number of things. Could be a
seized caliper, a flexi hose that's broken up inside and is acting like a
one way valve, pads stuck in caliper
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