Daddylonglegs
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| posted on 12/9/11 at 08:01 PM |
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Master Cylinder Connection
I've been trying to think the best way to sort out my brakes. The rears lock-up before the fronts so it will fail IVA. I did think about fitting
the Sierra compensator gizmo that sits under the rear of the car but am not sure if it would do any good on the kit.
After some more research, I realised that I think I have connected the MC incorrectly. I have a connection from the rear outlet going to a
'T'-piece at the rear then on to the slave cylinders. The front I have connected to the front outlet under the MC then off to another
'T'-piece for the front calipers. But I also have a third outlet on the top at the front which has a bleed nipple fitted.
The way I understand it is that the one front outlet goes to one caliper at the front and the other to the other side caliper. My question is, if I
re-make the connections so there is a single pipe to each caliper from the front 2 outlets, is this likely to make the front brakes more effective?
(i.e. lock-up before the rears)
Hope that makes sense 
JB
It looks like the Midget is winning at the moment......
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adithorp
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| posted on 12/9/11 at 08:07 PM |
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Short answer... No.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Daddylonglegs
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| posted on 12/9/11 at 08:15 PM |
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Oh! 
So any ideas what to do next then?
It may be that because the discs and pads are new that they need bedding in because the 9" drums at the rear are well worn-in but with new
shoes.
I need to sort something out. I have heard that EBC 'green stuff' pads will improve the braking?
Front is Cortina calipers BTW.
JB
It looks like the Midget is winning at the moment......
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MikeRJ
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| posted on 12/9/11 at 08:20 PM |
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Are you absolutely certain there is no air in the front system?
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Daddylonglegs
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| posted on 12/9/11 at 08:27 PM |
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Must admit, I did bleed it myself using the solo-bleed kit i have, but I may have a bit in still, can't be sure. I think I will get a second
pair of hands and do it the old school way.
Also, I have just been reading a recent thread regarding fitting an adjustable compensator in the rear line. Is this viable/acceptable for IVA?
It looks like the Midget is winning at the moment......
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Xtreme Kermit
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| posted on 12/9/11 at 09:06 PM |
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Having just put new disks and 1144 pad on kermit I can honestly say that to begin with the new brakes were truly frightening until I had done a couple
of hundred miles 
Maybe they are still green and need be bedded in.
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Daddylonglegs
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| posted on 12/9/11 at 09:14 PM |
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Maybe that will help, but how the heck do I bed in brakes on a car that's not iVA'd yet?
It looks like the Midget is winning at the moment......
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RichardK
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| posted on 12/9/11 at 09:36 PM |
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Rear line sounds right but the front shouldn't be tee'd off, mine isnt anyway, mine has a separate line to each caliper, front bottom and
side.
I would then put some new shoes in the rear
That's what I would do any way
Cheers
Rich
Gallery updated 11/01/2011
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ashg
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| posted on 12/9/11 at 10:41 PM |
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there should be a pipe to either side at the front from the mc. the problem with the rears locking up first is simply because you have 9inch drums.
fit the ford bias valve and the problem should be solved.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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britishtrident
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| posted on 13/9/11 at 06:38 AM |
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A tee fitting dosen't have any effect on brake efficiency, you can plumb the front brakes anyway you want it will make
zero difference to the front-rear brake balance.
[Edited on 13/9/11 by britishtrident]
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britishtrident
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| posted on 13/9/11 at 07:09 AM |
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If you have Girling brakes you can fit smaller bore wheel cylinders from an Escort Mk3 1.4 Saloon.
Sierra cylinders are either approx 22mm or 21mm the Escort cylinder is just under 18mm.
if you have Teves brakes it may be possible to fit Fiesta Mk1 wheel cylinders.
Brakes International web site will have the cylinders at good price.
To avoid confusion when ordering brake parts it is best to use the term wheel cylinders rather than slave cylinders.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Daddylonglegs
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| posted on 13/9/11 at 01:13 PM |
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quote:
Originally posted by ashg
there should be a pipe to either side at the front from the mc. the problem with the rears locking up first is simply because you have 9inch drums.
fit the ford bias valve and the problem should be solved.
Whilst rummaging around in the garage boxes, I found the compensator valve from the donor box of bits I had. I think it's the later type with
inlet and outlet inline and a stepped end which I think goes forward?
Trouble is, will it actually work because they were designed for the Sierra which is just a smidge heavier than my 442? I know they were mounted at a
specific angle in the Sierra, so maybe if I mount it at a lesser angle it will work sooner?
What is the general view on it?
JB
It looks like the Midget is winning at the moment......
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britishtrident
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| posted on 13/9/11 at 03:40 PM |
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Sierra valve is a G sensing valve and is not suitable.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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ashg
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| posted on 13/9/11 at 05:44 PM |
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they are completely suitable if mounted correctly. at iva if you have a g sensing valve they have to test the breaks by driving the car. they still
apply different amounts of pressure using their measuring device but they can only look to see if the back wheels lock up. been there done it got
the t-shirt and all that.....
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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britishtrident
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| posted on 13/9/11 at 06:05 PM |
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first used on the 1960s Austin 1800 Girling G valves are a clever bit of kit but really not suitable for the brakes on a home build and
they won't operate at all durring normal roller brake test.
The simplest and best solution is just fit smaller bore rear cylinders, the next simplest solution is a line pressure shut off valve.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Daddylonglegs
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| posted on 14/9/11 at 09:03 AM |
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Thanks for all the good replies guys
How do I know what wheel cylinders I have on my rears? I know I bought them new but that was around 3 years ago!! And I am not sure what they are.
Also, what size would be suitable i.e. how much smaller would I need to go?
Sorry for all the questions, but I really want to try and cover all bases before the dreaded IVA
JB
It looks like the Midget is winning at the moment......
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steve m
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| posted on 14/9/11 at 09:17 AM |
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Hi
You say the rears lock up before the fronts, (mine do as well)
If we are talking about a 7 style of car, most of the problem i see, is not the brakes being to efficent, but the fact
that there is minimul weight over the back axle, and so the rears skip about
On my car the problem is so bad that every MOT we have had 2-3 guys literally sitting on the back to get the rear brakes to work on the rollers,
This year the guy took my car out for a quick blap, and was quite happy
My car was pre iva etc, so i do not know the actual criteria
Steve
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Daddylonglegs
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| posted on 14/9/11 at 09:55 AM |
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Thanks Steve.
Maybe I should just fill the tank to the brim and try again as there is only about 1 1/2 gallons in there at the moment? Perhaps some
'baggage' added for the test would help too? 
[Edited on 14/9/11 by Daddylonglegs]
It looks like the Midget is winning at the moment......
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