86 brakes locking up on their own

The guy at the shade tree shop I took it to, put some brake fluid in before
this problem started, but he said it was DOT 3 and that is the only type
they have. I read where contaminated fluid could cause erratic brakes and
had planned on draining the system and see what happens then. I will look
for a Bosch guy also. Thanks

"Mike" > wrote in message
news:Kll%c.15589$aW5.11418@fed1read07...
> In >, X-Eliminator
> writes:
> >This soundls like a defective ABS unit.
> >
> >================================================= ======
> >On Sun, 05 Sep 2004 17:09:12 GMT, "Raymond Prince"
> > wrote:
> >
> >>My brakes have slowly engaged three or four times now, on their own.
While
> >>driving down the road I begin to notice RPM's increasing and speed
> >>decreasing until it just comes to a stop. The only time I seem to be
able to
> >>force it into doing this is after going in reverse into my driveway. It
has
> >>done it twice after doing this. The other time, I can't recall going
into
> >>reverse for any length of time. All four wheels lock down, it does not
pull
> >>to any side and it will release after I either bleed one of the front
> >>calipers or play around with emergency brake and forward gears, turning
> >>ignition off and on, and time. I am baffled and hope that it is
something
> >>that has popped up before on someone else. Any ideas or leads would be
> >>greatly appreciated.
> >>Thank You
> >>R P
> >>
> >>
> >
> Yup, Sounds about right--the system might be pressurizing
> when the pump starts during the 3-5 mph test. Strange
> that you aren't seeing an ABS warning light. You might try
> a complete system bleed/fluid replacement or two before
> you shout for help.
>
> There's a special Bosch test set for the early ABS (Early
> C4 ABS codes aren't a part of the diagnostic system.) Problem
> here is that dealers seldom work on these systems and many
> oursource the work (so it gets marked up to cover dealer
> profit). Try to find a Bosch brake specialist who regularly
> works on early ABS. GM dealer might know ditto a Chrysler
> dealer.
>
> Please let us C4 drivers know what you find out & what
> fixed it -- 15 year old cars tend to have the same
> problems.
>
> Regards, "Mike"
> -- mikeellison3xxxatzzzyahoo.com --
>