Re: Brakes

["Pablo A. Carselle" <pcarselle@worldnet.att.net>]

Lino M. Valadas wrote:
> 
> Hello all,
> 
> I have two problems with my brakes.  I'm looking for ideas on what could be
> causing them and how to fix them.  I have an 86 5kCDQTW with about 180k Km.
> 
> Prob 1.
> Under hard breaking, hard enough to activate the ABS the dash light "(!)"
> flashes red and beeps........


Lino:
Most probably pressure accumulator. Better replace ASAP. On a hard stop at high speed 
you may not be able to stop the wheels rotation and therefore the car.
If ABS activates still today, some life may be left in accumulator. I would not risk any 
extended driving specially at freeway speeds.
There is a relatively easy test for hydraulic servo ( booster amplifier ???) leakeage:
After running engine at abt. 2000 RPM's for a few seconds. stop engine. Carefully 
disconect metalic return line from servo to hydraulic oil reservoir( have rag handy )and 
observe for a couple of minutes. Only a few drops of hydraulic oil should come out from 
servo. If a more definite flow is preesent, servo is leaking.
If servo leaks during this test, there is a high probability that pressure accumulator 
is Ok. 

> Prob 2.
> When the ABS is activated (under hard braking) the rear left wheel still......locks
> Can you get to lock any other wheel other than the rear left ?
If you can, ABS central system should be suspect
If not, and the pedal feels the hydraulic fluid return pump thrust, then may be a 
localized left rear wheel issue. Probably connector related.
Suggest careful evaluation of LR wheel conector and wiring , and application of a couple 
of drops of Stabilant 22 fluid. ( very good contact enhancer ) at connector blades, 
after cleaning , if visibly necessary.

Good luck

Pablo
> Thanks