Hmmm
Kinda hard to diagnose the vehicle from this thread.
This is the problem where the right front wheel locks up after about 10
stops?
When you installed the brake master did you install the rubber seal?
I usually measure the distance the brake booster rod clearance in the old
and in the new master.
Maybe you should measure that area now since maybe the rod is constantly
applying pressure to the master cylinder.
You might even find a little adjustment on the rod. I HAVE NEVER HAD TO
READJUST THAT ROD!
I have had to replace 1 or 2 boosters for other reasons, 1 of them was
improperly rebuilt and had some unattached rod on the inside.

Did you do the tests I suggested previously?

NEW PARTS with a lifetime warranty? What brand are these parts?

You need to check the oil pressure if you think that is why the light and
buzzer are going off.
Might be the oil pressure switches.

"lynn lascu" > wrote in message
...
> Hello to all who have responded to my brake problem on the 88 jetta. I
> have put two different masters on the car and the problem still goes on.
> I have replaced the calipers twice. Everthing has been bought and
> returned for new parts again. I've noticed that my oil light and buzzer
> comes on also and it seems that when this happens the brakes start their
> problem. This has been going on for two months now and its driving me
> nuts. All I did was replace the master and all this started happing.
> I've put all new parts and they came with life time warranties. Could
> the booster cause this problem? I've dropped the oil pan and checked the
> pump to make sure that it was good, but the oil light still comes on and
> the buzzer to. I did put dot fluid in master as called for. Ever part
> put on has been replaced twice already and still the same problem exist.
> I work on all of my cars and this one I just can't figure out. HELP
> AGAIN PLEASE.
>