I wasn't suggesting it couldn't be done (ie. adequate handbrake and correct
brake balance with rear discs), just that it wasn't necessary, and that drums
are more than adequate for the job, certainly in a Quantum. For most Quantum
builders it would be unecessarily costly, for no gain and a possibility of
rendering the car dangerous if the brake balance ended up incorrect.
Martin
----- Original Message -----
From: 'Bill Allison' via Quantum Owners Group
To: quantumowners@googlegroups.com
Sent: Monday, April 01, 2019 11:35 PM
Subject: Re: [Quantum Owners] Brake master cylinder conversions
Martin et al
On my saloon I have Honda Legend discs on the front with Wilwood Midilite
calipers. The rear has Golf Gti alloy calipers on Peugot 205 discs with no
apportioning valve. Can be seen here. Brake balance is near perfect and the
handbrake is sufficiently powerful to lock the wheels on dry tarmac.
Quantum saloon - full rebuild | welcome to the ...
Sat Dec 11, 2010 9:26 am The quantum's off the road for a
full rebuild to "as new" condition - mechanical, elect...
Many people are not aware that drum brakes have a built-in servo-assistance
characteristic so are more powerful, all other things being equal, than disc
brakes. in my case correct balance was easily achieved with careful choice of
pad material and the pressure reduction to the rear deleted. Handbrake
effectiveness is a matter of ensuring that the combination of gearing inside
the caliper and lever arm lengths (handbrake and caliper) applies correct force
on the pads for the given disc and wheel diameters.
Best regards
Bill
Bill Allison
Borders Group of Advanced Motorists
Secretary (Cars)
Chief Observer (Cars)
07702 739474
01750 22550 (before 21:00 please)
www.bordersiam.org.uk and www.bordersiam.org.uk/ydi
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On Monday, 1 April 2019, 21:49:15 BST, Susan and Martin Scott
<susanandmar...@corringham99.free-online.co.uk> wrote:
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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