[E-Type] Series 3 xke 2+2 rear brakes issues

Good morning all ! Question this morning is I noticed my
rear brakes were not engaging on my 1973 xke. I pulled the
access plates,bled the rear brakes and they appeared to be
working as they were supposed to. Left four black streaks
on a concrete pad. Five days go by and now I don’t have
rear brakes. I do not see any kind of leak. Could this be
a master cylinder? Awaiting your reply,JW–
IMADUSTY
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In reply to a message from IMADUSTY sent Sat 30 May 2015:

There are others who are expert in this system, but one
thing that crops up regularly is failure of the internals
in the little flexible hose to the rear brakes, apparently
it is not obvious from external inspection.–
The original message included these comments:

rear brakes were not engaging on my 1973 xke. I pulled the
on a concrete pad. Five days go by and now I don’t have
rear brakes. I do not see any kind of leak. Could this be
a master cylinder? Awaiting your reply,JW


Mark Brown 71 S3 Etype
Ohope beach, New Zealand
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In reply to a message from IMADUSTY sent Sat 30 May 2015:

good chance it will be the servo leaking–
850225/679,1E21003,2W2001BW,JNAEY3AC100218,SAJNV4841KC156072
MELTON, Australia
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In reply to a message from Norman LUTZ sent Sun 31 May 2015:

Manny thanks for the responses. Norman do you think the
servo leaking would show up externally or is this
internal? Jw–
The original message included these comments:

good chance it will be the servo leaking


IMADUSTY
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In reply to a message from IMADUSTY sent Sun 31 May 2015:

Most likely internal.–
850225/679,1E21003,2W2001BW,JNAEY3AC100218,SAJNV4841KC156072
MELTON, Australia
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I am having a similar issue, only with a brand new MC and Servo from Welsh. I was not getting any brake pressure, front or rear, and replaced the MC. Now I have strong front pressure, but very little at the rear…suspecting the servo unit…thoughts?

If it’s a later SIII, then the PDWA may need to be reset.

As I recall you have a '68… are you confident you got a good bleed at the rear brakes? I have always had to use a simple pressure bleed to get the job done, never been able to get there with just a pedal bleed - especially if major components have been replaced.

Hello George, you have a great memory…yes, '68 verified 1.5 series. I too have a pressure bleeder that I have used for several years on other cars. This worked fantastic for bleeding rears first, then fronts. I’ve bleed both systems several times, and am using Petrosin Super DOT 4 brake fluid. This is why I am suspecting a malfunctioning Servo unit. Frustrating this is, I purchased these from Welsh 3 or so years ago as I was building my car as part of a ground-up resto. Welsh will not give me a warranty extension, so replacing the units have been very costly!