Re: Brake bleeding, rear wheels _STOP - READ THIS

[QSHIPQ@aol.com]

In a message dated 97-01-04 15:07:24 EST, you write:

<< -I rigged a pressure cap to allow compressed air into the MCylinder and
 used 10-25 PSI for pressure 
 -the strainer is removed from the MC
 -the MC is full of pentosin
 -the ABS is turned off with the ignition off
 -the ABS is turned off with the ignition on
 -the ABS is turned of with the car running
 -the ABS is not turned off, car not running
 -brake pedal pushed in (mechanically, via a bar between the seat and the
 pedal)
 -bled the  MC, plenty of pentosin from both lines
 -bled the brake lines after the ABS hyd. unit, steady run of fluid but not
 a gayser!
 -moved the lever of the brake proportioning valve lever, no difference
 -bled the brake proportioning valve, very little pentosin
 -looked for a hight sensitive proportioning valve, did not find any
 -looked in the Bentley for brake bleeding procedure, NOTHING Helpful
 (looked in two books 85-89 and 89-92 no help
 NO PENTOSIN at the rear with all the above steps!!!!!!!!!!!!!!!!!!!
 front bleed OK (with car off and  ABS is normal position)
  >>
Wow, good listing of procedure....  HOWEVER...  The bleed should be without
the brake pedal pushed in....  The height proportioning valve sits on the
rear trailing arm on the left side of the car....  Secondly, NO PENTOSIN in
the brake lines, that is DOT3or 4 BRAKE FLUID ONLY....  Pentosin is found in
the power steering the brake MC BOOSTER, and the BOMB (brake pressure
accumulator, separate from brake fluid)....  Brake fluid goes into the brake
MC resevoir (no need to pull screen), Pentosin in round bottle to the center
of the car....

Do the right rear caliper first, sometimes they are crudded, you can use the
brake pump method (someone push brake pedal in slowly while you loosen the
7mm bleeder, close it back up when brake hits floor, repeat)....  then the
left rear, then right front, left front, then slave cylinder (down below
steering rack on top of trans - 7mm too)...  The power bleeder you rigged
should work assuming you are refilling the resevoir before it gets too
low....  NO more than 15psi or the seals below the resevoir will start to
leak on you, esp if you've never replaced them (they are cheap, but a PITA to
replace).....  Those height proportioning valve either work or they don't, if
i's frozen or the spring is missing (broken) nothing happens there....  It's
expensive, and given what it does, not an absolute critical item....  But you
should have rear brakes of some sort, even if the valve is broken, it
operates in a narrow percentage band of rear bias, never shutting off the
rear or the fronts totally....  My guess is that you eliminate the pedal
pusher thing you made, the rears will bleed fine....  Post me if you need
more help here.... Hope that you didn't already put pentosin in the MC....  

HTH

Scott