[DML] Brake Problem

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

On a nearby Delorean I helped the owner with some brake problems. I
mention this because it turned out to have an unusual cause. When he
first got the car it pulled really hard to the right. I correctly
diagnosed a stuck piston in the right caliper. We rebuilt it and it
fixed the pull to the right. It never really seemed "right" but it
definatly was better. Some time later (a year) the car would again
pull really hard to the right after driving for a while. It pulled so
hard to the right the right front wheel started to smoke! Afer waiting
around an hour for it to cool off it would drive normaly for a while
until it would lock up again. I thought maybe the brake fluid was
contaminated and the water inside was turning into steam causing the
pressure and locking up the right caliper. We flushed and bled and got
no water or dirt out. Now I realize that was wrong because both front
calipers would have locked up if the fluid was contaminated. I have
seen this only twice and not on Deloreans. We changed the front right
brake hose and the problem has not reoccured. It seems the inside of
the brake hose comes loose and acts like a check valve. When the brake
fluid heats up the pressure cannot be relieved back to the Master
cylinder (this is called compensation) it forces the pistons on the
caliper to lock up the rotor. I am bringing this up because most of us
are driving on 20 + year old hoses. If anyone gets these symptoms they
should immediatly consider the brake hose since it is way past it's
service life.
David Teitelbaum
vin 10757








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