I'm having problems with my front brakes (disk) not releasing completely
upon removing my foot from the pedal. When driving it does release
some but still drags. This has been a problem since I replaced the
master cylinder with a rebuilt one and at the same time rebuilt the
calipers and replaced the brake hoses with metal braided ones. I did
this several months ago but I've only driven a few hundred miles since
then, mostly town and country roads. I've followed Barney's suggestion
to remove some of the gasket material, allowing the pistons to have a
bit more return travel to make sure the port isn't blocked by one of the
cups but that has not helped. Also, using DOT 5 brake fluid.
If I remove the banjo fitting at the bottom of a caliper and then place
the rubber tip of the nozzle on an air hose in that hole I can activate
the pistons pneumatically. As soon as I release the pressure or remove
the nozzle the pistons/pads withdraw and I can spin the rotor easily.
Before taking the master cylinder apart I was looking at one I removed
from my parts car. I assume that it has been rebuilt because it has
"brass" sleeves. Was the original one sleeved? You can see from the
picture that the larger port on both sides is the same size through the
sleeve. The smaller hole in the brass sleeve is tiny compared to the
size of the hole in the master cylinder casting. The drill bit is the
size of the hole in the sleeve.
Does anyone know the correct diameter for the two holes (actually 4 if
you include the clutch side)?
If the hole in the sleeve should be the same size as the hole in the
casting could this smaller hole be the cause my dragging brakes?
If a picture doesn't load use the following link.
master cylinder <http://bellsouthpwp2.net/e/b/ebayde/MGA/mastercylinder.jpg>
Any help would be greatly appreciated.
Thanks,
Pat
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