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Location:
Blue mtns
Registered:
November 2003
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AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 03:59
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i just got an AE86 disc to disc rear axle put into my 86, and i had to get a JDM brake master cylinder installed so i can actually use the rear discs, as it won't work with the Oz spec one.
i heard a rumor that it's possible to alter brake balance on the JDM master cylinder because it's got some extra valve that the aussie one doesn't.
anyone know if this is true? if so, how can i adjust it?
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 04:28
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JDM ae86's have whats known as a "P valve". now i dont know how it got the name, but the device is a brake bias controller and its located on the driver front strut tower.
its probably the most difficult part to come across... god knows why... but without the valve, it makes the disc rear end feel crappy because its got getting enough bias.. this is why ppl with adm 86's get shitty when their $2500 rear end feel like shit...
its only on vehicles fitted with disc rear ends stock, so the euro ones would surely have them too.
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Location:
Adelaide
Registered:
May 2003
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 06:02
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Just spend $130 on a proper wilwood brake bias valve.
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 06:58
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jap ae86's run a seperate system for the front and rear.
didnt know the master cylinder was different though?
just the lines on the drivers side strut tower
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 06:59
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| ae95 wrote on Sun, 21 November 2004 17:58 |
jap ae86's run a seperate system for the front and rear.
didnt know the master cylinder was different though?
just the lines on the drivers side strut tower
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master is identical to every other ae86
the filler may be different tho?
the system isnt separate, its split by the bias p valve
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 09:45
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if ur good with a lathe theres a easy solution
i put a disc rear end on the t-18 and yeah the brake bias was way out, dads good with numbers he calculated how much bias we need then turned up a little spacer to go under the spring in the proportioning valve, worked a treat!
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 09:59
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| jessetamsett wrote on Sun, 21 November 2004 20:45 |
if ur good with a lathe theres a easy solution
i put a disc rear end on the t-18 and yeah the brake bias was way out, dads good with numbers he calculated how much bias we need then turned up a little spacer to go under the spring in the proportioning valve, worked a treat!
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get your dad to make a shitload of em up and sell em!
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Location:
cambo
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 10:10
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or alternatively tell us the thickness of the shim and we can all do it ourselves. however i know it would be determined by weight of the car, m/c diameter etc...
ae86drift, when you hear of it as 'p' valve it means proportioning valve like mentioned. i think i may have heard of Bill Sherwood gutting the proportioning when doing a brake upgrade. apparently made a good difference.
although people should realise that with crap brake fluid the proportioning valve is one of the first to get blocked, meaning your bake brakes may not work at all, and most people wont notice. this happened to me and i only noticed on the dyno. after stripping down the proportioning valve and cleaning it out it was sweet again.
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 10:16
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ahhh there you go!
another item to add to my faq
 cheers niga@
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: AE86 4 wheel disc-brake balance
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Sun, 21 November 2004 11:17
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99% sure it was 3mm thick
it was just a 3mm thick spacer with a lip on the middle of it that went through the spring
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Location:
Blue mtns
Registered:
November 2003
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Re: AE86 4 wheel disc-brake balance
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Mon, 22 November 2004 07:27
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ok, so there this valve... then what? how do i adjust it?
i'm not a mechanic, just a parts salesperson  what needs to be specifically done?
i've found the valve (i think...) on the strut tower, with a whole bunch of steel lines going in and out of it. is that the valve? or is it something else...? coz from what i can gather, only the overseas versions came with it
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Location:
ghetto area 2745
Registered:
November 2003
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Re: AE86 4 wheel disc-brake balance
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Mon, 22 November 2004 08:21
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| whatcrazyguy wrote on Mon, 22 November 2004 18:27 |
ok, so there this valve... then what? how do i adjust it?
i'm not a mechanic, just a parts salesperson what needs to be specifically done?
i've found the valve (i think...) on the strut tower, with a whole bunch of steel lines going in and out of it. is that the valve? or is it something else...? coz from what i can gather, only the overseas versions came with it
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hmmm euro spec ae86 have a valve that people want interesting 
in ireland in 2 weeks time i will have a look then 4 u kid
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Location:
cambo
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Mon, 22 November 2004 10:37
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aus spec have the proportining valve, cant say its the same or different to the other models, quite possibly is.
there is no adjustment for it, only by either changing the spring rates in the valve or the easy way like mentioned by the use of shims.
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: AE86 4 wheel disc-brake balance
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Mon, 22 November 2004 10:58
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| EVOSTi wrote on Mon, 22 November 2004 18:37 |
aus spec have the proportining valve, cant say its the same or different to the other models, quite possibly is.
there is no adjustment for it, only by either changing the spring rates in the valve or the easy way like mentioned by the use of shims.
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just as i thought.
jap spec runs seperate lines which are not connected in any place after the master cylinder
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: AE86 4 wheel disc-brake balance
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Tue, 23 November 2004 06:50
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| takai wrote on Sun, 21 November 2004 17:02 |
Just spend $130 on a proper wilwood brake bias valve.
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who sells these Chris? I need one for my Sprinter as most of my bias is going to my rears instead of my new supra brakes.
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Location:
cambo
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Tue, 23 November 2004 06:53
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illegal for road use.
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Location:
Adelaide
Registered:
May 2003
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Re: AE86 4 wheel disc-brake balance
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Tue, 23 November 2004 06:55
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| EVOSTi wrote on Tue, 23 November 2004 17:53 |
illegal for road use.
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WRONG
Completely legal for road use, just so long as its not adjustable from inside the cabin.
From Revolution Racegear or Meridian Motorsports, they are the two big names which come to mind around this area.
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Location:
cambo
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Tue, 23 November 2004 07:52
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maybe different from state to state, i was under the impression they were completely illegal. might be worth checking with the engineer before getting one.
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Location:
Adelaide
Registered:
May 2003
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Re: AE86 4 wheel disc-brake balance
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Tue, 23 November 2004 07:56
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Well that is the case in at least 4 states. ACT, Vic, NSW and SA.
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: AE86 4 wheel disc-brake balance
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Wed, 24 November 2004 03:37
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I couldnt find Meridian Motorsports in the yellow pages, got a number?
SO how are these things normally connected? I have been told some only adjust the crack point, anyone know anything about this?
well anyway I desperatly need one of these so I can let u guys knoew how it works out when i try it.
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Location:
Ipswich
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Wed, 24 November 2004 03:42
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Takai: that's a pretty good price, is that what they retail for? I've never seen the Wilwood ones, only other brands (which seem to be a fair bit more expensive). I've heard rumours that PBR also make one, that's a bit cheaper.
And yes, AFAIK in QLD it's the same - you can have adjustable bias, just not adjustable from in-cabin. So if you put it in the engine bay etc then it's fine.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Wed, 24 November 2004 08:32
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Meridian Motorsport
Unit 7/ 1 -7 Friars Rd Moorabbin 3189
(03) 9553 4200
I'm sure they'll be nice to you
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: AE86 4 wheel disc-brake balance
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Wed, 24 November 2004 08:41
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I have heard of the PBR one I will check it out
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: AE86 4 wheel disc-brake balance
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Wed, 24 November 2004 22:17
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thanks Mrshin I called them up and they had the knob adjustable Wilwood adjuster for $126.50. However this is just an adjustable restrictor that goes inline with whichever end is getting too much braking power. I was hoping for a device that both lines come off the master brake cylender, go into it and then go off again. Anyway I will probably get one and try it out.
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Location:
Ipswich
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Wed, 24 November 2004 22:23
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SamQ: But why? By adjusting one line, the other one will also "adjust" relatively. As in, if the back brakes are getting too much braking power (common with brake upgrades) then limit the rear line, and the front one will get more power relative to the rear.
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Location:
Blue mtns
Registered:
November 2003
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Re: AE86 4 wheel disc-brake balance
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Thu, 25 November 2004 09:07
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i know for sure that repco sells the brake bias proportioning valves!
just rock up to any repco and ask for one, they buy 'em through rocket. but like said before, there's only two to choose from and one of them is the type that you put on the end of the car which you want to increase bias on.
the second type doesn't specify, but i think it's the type to be mounted around the master cylinder and stuff...
go ask repco!!
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: AE86 4 wheel disc-brake balance
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Thu, 25 November 2004 12:08
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That is a very good point demuire and I have a reason which I think is logical. This is because right now I have too much front bias, no worries u say chuck it inline with the front. However if I put some big rear disks on then it may be the oppersite problem where the back gets too much bias. I admit its unlikely but it would of been nice to have the assurance it wasnt going to happen.
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Location:
Melbourne
Registered:
August 2002
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Re: AE86 4 wheel disc-brake balance
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Thu, 25 November 2004 15:09
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then how about get 2 of this valve and put one on the front and one on the back, then u have full adjustability. 
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Location:
Ipswich
Registered:
May 2002
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Re: AE86 4 wheel disc-brake balance
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Thu, 25 November 2004 20:55
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Too much bias on the front isn't really a very bad thing. Too much bias on the back is.
Besides, you can always swap the valve around (from front to back)
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