AP Brakes balance - how to fit adjustable valve.

Replied by Diesel Destroyer on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139380
I've e mailed Rob Bell a link to this page David as I know he'll be interested..

Figures look good.. Great in fact..

Need to get Mr Watson to get his rear set up tested...

Can't wait to see what figures I get.. Before trying them on the road and dying. :oops:

Diesel Destroyer.. 'The bringer of dreams'

by Diesel Destroyer

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Replied by David Aiketgate on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139383
I suspect you'll have to sit in the car behind yours and think about braking, rather than actually touch the brake pedal ;)

David
:shrug:

by David Aiketgate

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Replied by Kameleon on topic Re:Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139387
So for a quick and dirty fix, simply removing the OEM valve completely, assuming you have AP front brakes and 240mm rears would potentially yield good results?

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by Kameleon

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Replied by Fatbaldingoldgit on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139396

David Aiketgate wrote: Conclusion

I have found the brakes to be much improved over standard. The stopping power is a lot better while being balanced. i.e. braking hard gives amazing braking, and the fronts only lock under provocation.

Looking at the figures it appears that I now have a an almost exact 60 / 40 front / rear split. :woo2:


David..did you test at any particular speed?..I'm thinking that the higher the speed the greater the weight transfer to the front and therefore you would need less braking at the rear and increased likelihood of rear lockup for a given setting....

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by Fatbaldingoldgit

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Replied by David Aiketgate on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139397
I tried at various speeds up to 60-ish. :dry:
I believe that even with full hydraulic pressure to both front and rear it will still always be the 4pots that lock first. Indeed on the brake machine we couldn't get the rears to lock up at all.

David
:shrug:

by David Aiketgate

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Replied by David Aiketgate on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139404
Now that the black plastic cover is back in place the mod is out of the way, and there is no chance of it being 'adjusted' by accidental knocking. :broon:

David
:shrug:

by David Aiketgate

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Replied by Rob Bell on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139405
Well done David! I've been banging on about this for what seems ages, and my bad for not having done this earlier! :lol:

Interesting that you can't get the rears to lock even with the rear being fully "open"? Perhaps you can get away with larger rear discs?

I think that I'll get myself one of these now - although I suspect that it'll be the screw-type rather than lever variety, as I'll be positioning it in the same place you have yours :)

I can see this becoming a very popular modification ;) Great work!
by Rob Bell
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Replied by David Aiketgate on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139409
I don't know if the max setting on the valve is fully open, but I suspect it is looking at the figures. Of course that does beg the question 'why didn't MGR just take out the bias valve when they fitted the 304s on the front?' They could have saved themselves money and improved the brakes at the same time. Double win! :woo2:

I have just noticed that the Torque App does a 60 to 0 time. Anybody know what the standard figures are?

David
:shrug:

by David Aiketgate

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Replied by Rob Bell on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139416
No - and of course those figures would be highly dependent upon weather conditions, road surface and the tyres fitted.

When I get a bias valve, I'll see whether I can do some back to back testing on a private road :)
by Rob Bell

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Replied by Fatbaldingoldgit on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139417
With the adjustment at one extreme is the flow completely unrestricted or is it just the maximum that the valve will allow?

If the two are the same wouldn't it be simpler to just remove the original valve and not replace it?

"You can’t be a real country unless you have a beer and an airline – it helps if you have some kind of football team, or some nuclear weapons but at the very least you need a beer"
- Frank Zappa

by Fatbaldingoldgit

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Replied by David Aiketgate on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139419
As I mention above, I don't know what the maximum opening is on the valve, but judging by the brake force figures I think it is pretty much 100% open. If that were the case then you are right, but it would need careful trial of that situation ie no valve fitted.
If in that situation you found that the rear brakes were too much then of course you would have no adjustment available.:shrug:

David
:shrug:

by David Aiketgate

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Replied by David Aiketgate on topic Brake bias valve -how to fit an adjustable valve.

Posted 10 years 8 months ago #139420
Having done bit of digging it seems that the valve has 7 settings ranging from 0-60%. ie 0% reduction of rear braking to 60% reduction of rear braking. So logically it should be 10% increments.

In other words max setting appears to be no reduction.

David
:shrug:

by David Aiketgate

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