Triumph Repair: 72 TR6 Brake Problem, brake warning light, dirt street

Question
My brake pedal went soft and barely stopped my '72 TR6.  I checked the
reservoir and it was empty.  I removed the master cylinder and discovered a
bit of brake fluid sitting in the servo housing.  To fix the problem I centered
the PDWA switch and installed a bolt with pin to hold it centered, installed a
new mc, bled left front, right front, left rear and right rear with a hose and
clear bottle.  My test drive was scary as I had no brakes!  I repeated the brake
bleed process and the test drive proved that I have brakes, but it felt like it
was front braking only.
Questions: Could the PDWA unit be broken?  Would the servo have anything
to do with this?  Do I have to fill up the front reservoir on the mc (doesn't look
like I should have to)?  
Any suggestions would be great!
Thanks,
Troy.

Answer
Hi Troy,
The sequence of bleeding should have been the furthermost wheel first which is the right rear then the left rear and right front and left front last to be sure you get all the air out.
Turn the ign switch on and note that the brake warning light and the oil light are on dimly. If the brake warning light is on bright and the oil light is off the PDWA is not centered and you should center it by bleeding the appropriate line to bring it back to center.
Be sure fluid is in both sections of the reservoir. To test the brakes find a dirt street and go 15 to 20 MPH and slowly apply the brakes until you hear a wheel slide. Then back up and look at the tire marks to see which wheel or wheels locked up. Then do it again and this time hit the brakes hard to see what wheels lock up. Ideally both tests should have locked up all 4 wheels but a drum and disk brake set will not always lock front and rear at the same time. If the second test only locks up just the front or back you need to work on the brakes that are not locking up. It is a different story on pavement so do the tests on dirt. If you get the fronts to lock up on the first test and all 4 on the second test, it is ok. On later years cars they installed devices on the brakes to make the fronts lock up first or only on a hard braking.
Let me know,
Howard