I've got confused with all the dot numbers now........ I've just looked back
at the (now deleted) original note, and if dot 5 has been replaced with 5.1
that may create a problem given what I found earlier (if it's correct info)?
A crazy numbering system which could have been better managed - But the DOT
(like all gov't depts) know best :-)
Martin
----- Original Message -----
From: "Jim Hearne" <j...@quantums.info>
To: <quantumowners@googlegroups.com>
Sent: Monday, March 25, 2019 2:15 PM
Subject: Re: [Quantum Owners] Brake master cylinder conversions
I remember working all this out on a spreadsheet years ago.
Does the Ford caliper being the sliding sort count as twice the piston area
?
Jim
-----Original Message-----
From: Susan and Martin Scott
Sent: Monday, March 25, 2019 1:48 PM
To: quantumowners@googlegroups.com
Subject: Re: [Quantum Owners] Brake master cylinder conversions
If the sizes of the pistons add up to the same area then the original master
cylinder will be suitable.
For my Rickman (using 4 pot Princess callipers) the pistons are 38mm each
but of course there are twice the number. The original Ford callipers were
54mm, so the same area, and the original master cylinder is suitable. I
suspect it's either air in the system or a master cylinder seal has given
out due to fluid incompatibility. Even purging the system fully won't get
rid of the old fluid because 1) some will inevitably be left behind and b)
the old fluid will 'swell' the seals and become absoorbed to soem extent.
Martin
----- Original Message -----
From: "'Robert Craig' via Quantum Owners Group"
<quantumowners@googlegroups.com>
To: <quantumowners@googlegroups.com>
Sent: Monday, March 25, 2019 1:12 PM
Subject: Re: [Quantum Owners] Brake master cylinder conversions
Hi Martin,
Not sure about the areas but the Cosworth calipers are certainly bigger than
the original XR2 ones were and worked ok. The Hispec 4 pots are smaller
diameter but spread over a larger pad area to give more even pressure.
Bob
Sent from my iPad
On 24 Mar 2019, at 22:53, Susan and Martin Scott
<susanandmar...@corringham99.free-online.co.uk> wrote:
Ignoring the fluid change..... What is the combined area of the pistons
compared to the previous single ones? I may know an alternative, but it
depends what the requirements are. It could be that a larger bore master
cylinder is needed, but some dimensions will be needed to calculate.
Martin
----- Original Message ----- From: "'Bob Craig' via Quantum Owners Group"
<quantumowners@googlegroups.com>
To: "Quantum Owners Group" <quantumowners@googlegroups.com>
Sent: Sunday, March 24, 2019 5:39 PM
Subject: [Quantum Owners] Brake master cylinder conversions
After upgrading my already upgraded 2+2 brakes from Cosworth single piston
calipers and huge discs to a much lighter Hispec billet 4 pot system, I
can't get a decent brake pedal and have next to no braking force. I purged
all the old brake fluid and refilled with dot5.1, pressure bled
everything. I'm thinking that my master cylinder may be faulty and just
looking at options. I know the later type cylinder is a bit like rocking
horse poo these days and if going to the extent of changing, I'd rather
have a more performance focused set up.
Has anyone fitted the Burton Power bias assembly. It does away with the
standard servo and master cylinder.
https://www.burtonpower.com/adjustable-bias-brake-assy-ford-fiesta-mk1-mk2-mk3-brk061.html
Bob
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