[Saloon-lovers] Brake booster new - still losing fluid!

Help please! I posted a month or two ago about how I was losing
brake fluid and blowing heaps of white smoke on startup in my 1967
420. I ordered a (what I believe to be) new, not rebuilt booster.
Sure enough the old unit was full of brake fluid. after much
bleeding I had decent brakes and no white smoke. I had been driving
the car almost every day up until about a week and a half ago.

Started the car yesterday - Heaps of white smoke, very little
brake fluid in the reservoir. What are the chances that this ‘‘new’’
unit is defective? Is there another culprit I should investigate.

Thanks as always for the help!

Chris–
Chris '68 420 '67 420 (x2) '00 Volvo XC70 '76 F150
Warren Ontario, Canada
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In reply to a message from Christopher Wielusiewicz sent Tue 12 Oct 2010:

There is only one path for brake fluid to come out your exhaust
pipe and that is through the booster.
You are not leaking brake fluid anywhere else, are you?
Call your vendor, ask them to explain it.
Where did you find an actual new booster?
Is it new old stock, meaning that it has been sitting in a box new
for 40 years? Rubber seals being what they are ‘‘new’’ old stock
might not be functionaly new.
P.–
Peter J. Smith, 1966 3.8S MOD
Carson City Nevada, United States
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In reply to a message from Christopher Wielusiewicz sent Tue 12 Oct 2010:

If it is a ‘‘new’’ rebuilt Girling booster, it can quite
easily be faulty. To rebuild these properly, the cylinder
needs to be sleeved, and in many cases rebuilders just put
new seals in. If the original anodizing on the cylinder has
worn away (very very common), then they will wear very
quickly after very little use, and drip fluid into the
vacuum chamber.

Alternatively, if this booster is new old stock, it could
have corrosion in the cylinder and/or dried out seals,
leading to the very same problem.

it must be removed and inspected. Sorry! maybe you can
exchange for a new one from the vendor?–
'52 A90 '53 BN1 '59 Mk IX '64 BJ8
Hong Kong, Hongkong
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In reply to a message from Christopher Wielusiewicz sent Tue 12 Oct 2010:

Take a look underneath the carpet behind the brake pedal.–
Jagmk2
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In reply to a message from Jagmk2 sent Wed 13 Oct 2010:

Thanks!

I looked in the areas suggested and found no brake fluid in the
pedal area. The booster is from a usual jag spares supplier in the
US. I’ll contact them tomorrow or friday to try and arrange an
exchange.

The unit is not new old stock - but it was, according to the box,
made in taiwan. I will try and ascertain if it is a repro part or a
remanufactured or rebuilt part. What a pain to change and bleed
the brakes again!

Will keep you posted on what happens,

Regards,

Chris–
Chris '68 420 '67 420 (x2) '00 Volvo XC70 '76 F150
Warren Ontario, Canada
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In reply to a message from Christopher Wielusiewicz sent Wed 13 Oct 2010:

I may be mistaken but I thought that the seal preventing
entry of brake fluid into the booster was part of the MC,
not the booster. Consider a car equipped with manual brakes
only–would fluid then leak out the front of the MC into the
air?–
The original message included these comments:

pedal area. The booster is from a usual jag spares supplier in the
US. I’ll contact them tomorrow or friday to try and arrange an
exchange.


Bob Wilkinson, 73 XJ6
Saint Louis, MO, United States
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In reply to a message from Robert Wilkinson sent Wed 13 Oct 2010:

I believe the poster is correct, although if the booster is
leaking internally, that will cause fluid into intake

If the booster is of similar design to my 69 420G, that is
with one master cyl only that is fitted in the engine bay
poking off the front of the booster,

The master cyl can, will and does leak

dont know whether it will cause the symptons you have

definitely put a seal kit in the MC, especially if it hasnt
been done for a long time, as they are not expensive, and it
sounds like you are up for a complete re-bleed anyway–
The original message included these comments:

I may be mistaken but I thought that the seal preventing
entry of brake fluid into the booster was part of the MC,


awg
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In reply to a message from awg sent Wed 13 Oct 2010:

The booster servo being discussed here is separate from the MC, it
located in the right front engine compartment.
P.–
Peter J. Smith, 1966 3.8S MOD
Carson City Nevada, United States
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In reply to a message from carsoncitysmith sent Thu 14 Oct 2010:

Got it. To rephrase, what I think might be leaking is the
hydraulic cylinder that is actuated by the servo and
attached to it. If the servo and cylinder are bought as a
unit and called the servo, then I agree that the servo is
defective–the hydraulic part of it, though.

Although I still might be mixed up. My experience is limited
to some Alfas that have similar a similar setup–except with
two remote servos.–
The original message included these comments:

The booster servo being discussed here is separate from the MC, it
located in the right front engine compartment.


Bob Wilkinson, 73 XJ6
Saint Louis, MO, United States
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