In a message dated 21/07/2004 22:45:31 GMT Daylight Time, doelakie@yahoo.com
writes:
After several years of driving my 65 BJ8 without a
brake servo, I finally got around to rebuilding
(replacing all seals in) my PBR unit. The main
cylinder looked excellent without any noticeable
scratches or scoring, hence I did not have it
resleeved.
After reinstalling the unit, I bled it, then proceeded
to bleed all four wheels. When I step on the brake
pedal it goes right to the floor with no resistance
whatsoever. However, if I pump it rapidly with about
a half a dozen strokes, it builds up pressure to what
I would consider about the right amount of "pedal".
It has a somewhat cushioned feel, as I would expect
with a servo. (previously a very firm pedal without
the servo). If I hold it there, it doesn't seem to
fade as long as I don't completely release the pedal.
But as soon as I let it return completely to it's
fully released position, I lose ALL pressure, and it
now goes right to the floor again! The master cylinder
was working fine before introducing the servo????
Any suggstons would be greatly appreciated.
Thanks, in advance,
John Lakie
65 BJ8
Ontario, Canada
I've had my share of trouble with rebuilds - in an original - and one thing
that cost me hours and was not the servo's fault was this:-
I'd bleed the brakes the old way...with pipe into bottle and willing(?)
slave at the pedal.
I'd do each wheel starting from the furthest etc.
I'd get up and test it...worse than before.
I'd blame all on servo and curse some more.
Probably strip servo out and check over for the nth time..
etcetc...you get the idea.
Eventually, I discovered that the bleed screws are fairly coarse and need to
be tightened up while the pedal is down at the end of each stroke, or -
perhaps better yet - still moving down. I found that releasing the pedal was
allowing air to draw back into the system. And, yes the end of the tube was
immersed.
Try that before taking any drastic steps.
Simon.
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