Pierburg Pump, Brakes, etc., etc.

[George Selby]

Stangely enough, my 1990 VW Jetta has been/is doing this right now.  It has been doing this ever since I bought the car.  I have replaced most of the lines on the car (hard and soft,) all calipers (twice) and wheel cylinders, the MC (3 times,) the brake booster and the brake pads.  However, my RF brake still keeps locking up.  I thought I had the problem licked when I shortened the pushrod between the brake booster and the MC last year, but the problem just resurfaced last weekend.  I unloosened the MC to see if somehow the aforementioned pushrod somehow lengthened, but it didn't.  It was hotter here last week, and I did have the AC on.  I use Valvoline Synthetic brake fluid (supposedly better heat resistance than DOT 4.)  Dare I replace the MC again, or should I just put a bullet in the car?  Seriously, I wonder if the barke fluid is expanding in the lines that runs behind the engine and exhaust manifold (coincidentally the line for the RF caliper) and if I should try to make a heat shield for it?

I concur with Ben about the easy diagnosis of the symptoms - the pedal gets harder, the car won't roll freely after you come to a stop, and you have to apply more and more throttle pedal to keep it moving, until it will hardly move faster than 45.

-----Original Message-----

>
>I am having one brake lock up and its not overly hot out yet. I am in 
>Southern Maine. Its been in  the 60 - 70 range.
>John