Doctor Derek Doctors
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| posted on 25/11/14 at 03:02 PM |
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Brake Proportioning Valve rather than Bias Bar set-up.
For my next sprint car that I'm about to start building I'm leaning towards using a Bias Proportioning valve rather than a bias bar.
I've not actually built a brake system like this so wondered if anyone had any pictures/knowledge/parts list of how they did it.
I'm sure I have seen that (or at least one) Spire race car use this system.
I'm assuming that I need a twin outlet MC like this:
http://www.rallydesign.co.uk/product_info.php?cPath=562_582_1311&products_id=10444
With a twin take-off banjo for the front brakes and a single banjo to the rear with a proportioning valve in the line to the rear like this:
http://www.rallydesign.co.uk/product_info.php?cPath=562_596&products_id=4108
and then the standard T-Piece at the rear of the car to split to each rear caliper and a couple of remote resevoirs on the MC (no brake light
required)
Caliper wise I'll most likely use Wilwood Powerlite or Dynalite 4 pots all round with piston sizes set front to rear to give the majority of the
brake bias.
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callan@t89.co.uk
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ReMan
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| posted on 25/11/14 at 05:59 PM |
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I'd say that should do it. A banjo or a T piece in the front line to split L+R
www.plusnine.co.uk
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SPYDER
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| posted on 25/11/14 at 08:03 PM |
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A proportioning valve in the rear circuit can only reduce the pressure to the rear so the rear circuit must be outbraking the front in the first
place.
Select your caliper piston diameters to achieve this.
We ran this system on our TR7V8 race car for years. We put larger diameter cylinders in the rear brakes (drums!) and used the valve to restore the
correct balance for dry racing. We could then increase rear braking for wet conditions.
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