Every day's a school day as they say... I've just done a 'net search and it
seems dot 5.1 and dot 3 are compatible.along with dot 4. The oddity is dot 5
which is silicone based (nb not 5.1. The others, dot3, 4 and 5.1 are glycol
based so are compatible with each other. Why are these things always so
complicated, and confusing numbers, surely DOT S1 would have been a better
label for the silicone one. Good news though as it means Bob's car may just
need the system bleeding. I've found in the past that if the system is drained
fully it makes it a lot more difficult to bleed - I used both an easybleed to
pressurise AND an assistant pressing the brake pedal before I was successful.
Martin
----- Original Message -----
From: 'Robert Craig' via Quantum Owners Group
To: quantumowners@googlegroups.com
Sent: Monday, March 25, 2019 1:22 PM
Subject: Re: [Quantum Owners] Brake master cylinder conversions
Single pot Darren.
Bob
Sent from my iPad
On 25 Mar 2019, at 13:20, Darren Siepka <dar...@siepka.me.uk> wrote:
Were they single pot escort / Sierra 4x4 cosworth or 2wd Sierra 4pot
cosworth calipers?
I have the 4x4 single pot front with Peugeot single pot rears on my saloon
( this is with the current escort MC)
On Mon, 25 Mar 2019, 13:13 'Robert Craig' via Quantum Owners Group,
<quantumowners@googlegroups.com> wrote:
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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