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#Post#: 99858--------------------------------------------------
Conversion to dual circuit braking
By: pintofale Date: November 11, 2015, 7:51 am
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My S2 has single circuit brakes, so if I spring a leak somewhere
I lose all braking (and of course the transmission brake is no
good when moving).
I'm not normally too safety conscious, but I was toying with the
idea of upgrading to dual circuit as part of a general tidy up
and improvement of the old girl.
I think I should just need a new master roll of pipe & ends (I
will replace all pipework).
Has anyone done this upgrade, and is there anything unexpected
or to watch out for? Is there supposed to be a pressure reducer
somewhere (don't think I have one at present, just tee pieces).
#Post#: 99859--------------------------------------------------
Re: Conversion to dual circuit braking
By: Redwinch Date: November 11, 2015, 1:16 pm
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Depending on engine type, it would be prudent to fit a servo as
well as a dual servo master cylinder, it was a fairly common
conversion in the early 80'S, Thing to watch is that cylinders
were produced with different threads, ie, some unf, some metric,
pedal box would also need changing
#Post#: 99861--------------------------------------------------
Re: Conversion to dual circuit braking
By: GlenAnderson Date: November 11, 2015, 1:55 pm
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Whilst regular handbrake turns are asking to break something,
believe me when I say that the handbrake is more than capable of
bringing you to a controlled stop in an emergency, having done
just that with a loaded 109" and trailer.
#Post#: 99862--------------------------------------------------
Re: Conversion to dual circuit braking
By: Doug_T Date: November 11, 2015, 1:55 pm
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The dual circuit master cylinders only fit with a servo, so
you'd need to get the pedal and tower, the servo, and on a
Series 2 enlarge the brake pedal hole in the bulkhead.
There are also at least two different types of dual circuit M/C,
depending whether the setup is an early or late version (this is
fairly clear in the Series 3 workshop manual), with different
ways of piping them up to suit. Also the PDWA shuttle valve
between the two circuits as fitted to the late S3 system isn't
the cheapest thing in the world, neither is a pukka TRW late
dual circuit master cylinder.
A look at the Series 3 workshop manual would be where I'd start;
there are copies knocking around on the interweb if you don't
have one already. :thumbs:
#Post#: 99864--------------------------------------------------
Re: Conversion to dual circuit braking
By: ashcrroft752 Date: November 11, 2015, 2:51 pm
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The hand brake can slow you during total brake failure, didn't
help me though, brake failure sub 20mph buy the time I'd gotten
over the surprise at the pedal going straight to the floor,
given it a second pump, I'd just got my hand to the brake when I
ran into the back of a stationary Rover street wise.
#Post#: 99866--------------------------------------------------
Re: Conversion to dual circuit braking
By: NoelC Date: November 11, 2015, 3:44 pm
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[quote author=ashcrroft752 link=topic=9522.msg99864#msg99864
date=1447275091]
I'd just got my hand to the brake when I ran into the back of a
stationary Rover street wise.
[/quote]
To be fair that could be considered a public service, removing
one of those abominations from the public highway. I trust you
and the series were undamaged in the incident? Having seen a
year 8 lad fall sideways off his bike onto a Rover 25 and do
enough damage to the front wing to prevent the passenger door
from opening I doubt a street thick would put up that muach
resistance.
#Post#: 99870--------------------------------------------------
Re: Conversion to dual circuit braking
By: Serious Series Date: November 12, 2015, 2:53 am
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Are the various Master cylinders all the same stroke and volume
?
Do single cylinder brake drums use the same volume of fluid as
dual cylinders?
#Post#: 99887--------------------------------------------------
Re: Conversion to dual circuit braking
By: ashcrroft752 Date: November 12, 2015, 2:34 pm
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Rear end of the street wise was severely damaged I bent my inner
wings slightly, would have probably been fine if I'd had a front
bumper at the time!
#Post#: 99888--------------------------------------------------
Re: Conversion to dual circuit braking
By: NoelC Date: November 13, 2015, 3:26 am
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[quote author=Serious Series link=topic=9522.msg99870#msg99870
date=1447318406]
Are the various Master cylinders all the same stroke and volume
?
Do single cylinder brake drums use the same volume of fluid as
dual cylinders?
[/quote]
Short answer is no. Some of the differences relate to no more
than metric or imperial threading on the master cylinder AFAIK
but the TLS setup needs to shift more fluid than SLS etc.
#Post#: 99916--------------------------------------------------
Re: Conversion to dual circuit braking
By: aimbones Date: November 18, 2015, 3:53 am
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I'd not bother fitting a PWDA as it does little to help and can
actually hinder stopping in the event of a hose failure. If you
want something to light up fit a float switch top onto the fluid
reservoir.
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