It's not a good idea to overbrake on the rear! That's why there is an
apportioning valve on the donor XR2, so changing to discs will achieve no
benefit and probably compromise the parking brake.
Martin
----- Original Message -----
From: 'Robert Craig' via Quantum Owners Group
To: quantumowners@googlegroups.com
Sent: Monday, April 01, 2019 8:54 PM
Subject: Re: [Quantum Owners] Brake master cylinder conversions
I thought about the rear disc conversion but even on a twisty sprint track
with heavy braking zones the rear drums never got any real heat in them.
Perhaps with adjustable bias and maybe a bit more rear braking they might get
hotter but I never felt that discs were a requirement.
Bob
Sent from my iPad
On 1 Apr 2019, at 19:51, Darren Siepka <dar...@siepka.me.uk> wrote:
Are the rears solid or vented? I found my 280odd cosworth vented rears keep
glazing up and never get hot on the road no matter how I drove ! The 280 cougar
fronts work fab though.
300mm would need 16" + iirc ?
On Mon, 1 Apr 2019, 19:48 'Robert Craig' via Quantum Owners Group,
<quantumowners@googlegroups.com> wrote:
That's a very large disc size for a Quantum. What size wheels are you
using?
Bob
Sent from my iPad
On 1 Apr 2019, at 08:26, Tom Walker <walkerdot...@gmail.com> wrote:
I fitted a similar thing from Rally Design meant for a MK1 escort iirc,
with an adjuster for front/rear bias. And I've got a remote vacuum assist unit
(Austin something) driving my 305mm front hispec "monster" discs and rear disc
conversion.
However, due to various family issues, I've not driven the car since
fitting the vacuum assist (4 years now) so I can't attest to it's behaviour
yet. Maybe this summer (wistfully pondering)...
On Sun, 24 Mar 2019, 17:39 'Bob Craig' via Quantum Owners Group,
<quantumowners@googlegroups.com> wrote:
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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