[Vwdiesel] Weird brakes

[Sandy Cameron]

At 01:09 PM 02/01/2008 -0800, you wrote:
>My brother is having an odd problem on his rabbit, and I don't know what to
>tell him.
>
>His brakes will work fine for anywhere from 20-50 miles, but then slowly
>build up pressure until the car wants to stop. If he opens the two nozzles
>on the sides of the master cylinder the pressure releases and is then fine
>again for a while. This happens over and over. He recently put a new master
>cylinder and one new brake line on the car, and afterwards is when this
>started.


Before going for another MC, I suggest, just remove the 2 nuts that hold the
MC  to the booster, and pull it out amd re-seat it, being careful to  get
the push rod properly seated in the socket in the mc, and no crudd in the
socket.

Also, is there any chance he lost the gasket that goes between the mc and
the booster? And now the mc is too close to the booster.

And last, but first, did he bench bleed it properly? air in the system can
cause the noted symptom.

Still, the mc piston has to be being held too far forward, covering the
relief ports, to get it to pressurise like that. Probably not properly
installed.

No floor mats preventing the brake pedal to travel all the way out/release?
Look up under the dash to ensure no wiring, insulation, loose panels, are
preventing full release of the pedal


Sandy