[DML] Re: brakes locking up and won't release

["fivetwofive" <CBL302@xxxx>]

Payne,
I went thru the same problems as you,I replaced calipers,Master 
cylinder,ect,and still had my brakes locking up,THE problem is the 
Brake Lines,Sure they may look perfect on the outside,with no visible 
cracks,or damage/rot,But what happens is the(rubber) brake lines rot 
from the inside,and BLOCKS or restricts the passage(the normal flow) 
or return of the brake fluid,(kinda like a dam on a river in reverse)
which causes the wheels to "stick" or lock up,as the hydraulic 
pressure cannot be relieved,or is relieved very slowly because of the 
blockage or restriction, but of course when you 
apply the brakes,because you are applying hydraulic pressure against 
the "dam" (The restriction or blockage)it will allow the brake fluid 
to flow to the calipers,but 
when the pressure is removed,it cannot reverse flow,because of the 
blockage in the deterated rubber brake lines,hense the sticking or 
locking up of the brakes.But then again it could 
just be sticking or rust build-up in the brake calipers,from non-
use.Either way they are very 
old rubber brake lines,and should be replaced anyway,the braking 
system is one area you do not want to skimp on.Hope this helps.

Claude
000570 



--- In dmcnews@xxxx, "Payne" <bpayne@xxxx> wrote:
> Based on all of your advice and having my car in our shop today, I 
think
> everyone's right about the problem. First we flushed the system A 
LOT with
> fresh DOT 4, then I went for a drive and noticed the same gradually 
stiffer
> brake pedal. After a few minutes of driving we pulled it on the 
lift and
> all of the wheels were difficult to turn by hand. The tech relieved
> pressure at a couple of the bleeder screws and the wheels were able 
to turn
> freely again. So obviously pressure keeps building toward the 
calipers but
> fluid is not returning to the resevoir. Therefore it's got to be a 
bad
> master cylinder, right? I hope that's all, however I also need a 
new right
> front caliper since one of the pistons is frozen in place.
> 
> Oh well. I can't help but love the car no matter what happens. 
That's
> something probably no other car in the world could do for me.
> 
> payne