valves on the H4 3.5 fiesta based worked very well, enthusiastically on
the road or at Haynes.
Qless
Gary
On 13/11/2011 21:08, Jim Hearne wrote:
The valves on the Mk2 Fiesta don't actually just limit at a certain
pressure, they are, as the names suggests (G Valves) also controlled
by G.
Inside the valve is a large ball bearing which as you brake heavily
tries to move forward against the valve, the heavier you brake the
more the pressure the rear is limited.
This is why they have to be mounted onto the car at a specific angle.
On the later Mk3 Fiestas (without the mechanical ABS ) they did go
over to using pressure only valves which were screwed straight into
the rear outlets on the master cylinder.
I don't know how suitable these would be for use on the Quantum though.
Jim
On 13/11/2011 20:40, jin wrote:
Cheers Jim, helpful as ever, much appreciated, I was going to suggest
using a H configuration of pipe work to like a single valve in but
that would eradicate any split diagonal safety feature so best not
mess
So if I need to fit a pair, how do I know they are set equal?
I know I could rolling road them but this will only measure brake
resistance and not force of the fluid, any ideas?
At this rate I may just stump up for some ford valves and be done with
it
Don’t suppose anyone knows by how much the ford valves drop the
pressure by?
Cheers
On Nov 13, 10:48 am, Jim Hearne<[email protected]> wrote:
To replace the standard valves directly you would need to fit 2, one
for
each rear wheel as they are on separate brakes circuits.
The only way to use one is to change the split of the brake circuit to
front/rear instead of the standard split diagonal.
I have done this on my saloon and it passed the MOT brake test and the
brakes seem ok, though it was only on the road for the MOT and one trip
to the Donnington Park kit car show, then i took it off the road to do
the interior and it's still off the road !
Some people say you need a different design of master cylinder to do
front/rear split due to the different displacements for the front/ rear
circuits but if you look at the design of the master cylinder inside
the
pistons can move independently to a certain degree (they have to to be
able to handle one circuit failing) so i think it's ok.
Jim
On 13/11/2011 10:03, jin wrote:
hi all, just a quick question
both my G valves (or whatever they re called) look proper ropey so i
want to replace, ive heard i can get 2 from ford for around 100 but
ive also found a supplier of wilwood bias valves for around 40,
question is, can i just take the ford valves out and replace with one
of the adjustable type? will i need 1 per side at the rear or 1 for
the 2, one for 2 sides sound better cos its cheaper and it should have
pressure even both sides, but maybe i need 2 so i can fine tune the
pressure between each wheel and get perfectly even results both sides?
but then again they should be even anyway right?
im unsure so any help much appreciated
cheers in advance
justin- Hide quoted text -
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