NS Dev
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| posted on 12/3/05 at 03:27 PM |
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pressure type brake light switch
I am going to use a pressure switch in the brake line for my brake lights, but is there an SVA requirement that, with front/rear split braking system,
either front or rear must be able to switch the lights on, or am I ok just putting the switch in the rear line?
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britishtrident
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| posted on 12/3/05 at 03:41 PM |
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Technically by the old Construction & Use/Road Traffic Acts it should be in the front line but the reg seems largely forgotten now buried by euro
harmoised type approval requirements.
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Northy
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| posted on 12/3/05 at 03:49 PM |
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I put mine in the front as my loom had wires for a switch on the foot pedal there.
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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shaywez
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| posted on 12/3/05 at 06:17 PM |
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Mine is in the front as well
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bob
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| posted on 12/3/05 at 06:35 PM |
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Mines in the back as thats where the brake lights are,SVA didnt seem to have problems with it and i had spare wires run to the rear for future work
anyway.
 
Rescued attachment MK Indy build pics 077.jpg
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clbarclay
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| posted on 12/3/05 at 07:26 PM |
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you could have a switch in both lines connetced to the brake lights, but also to 'exclusive OR' logic circuit to work a brake faliure
light on the dash board.
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Hellfire
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| posted on 12/3/05 at 09:57 PM |
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Ours was in the back brake line...
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Kitlooney1000
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| posted on 12/3/05 at 10:29 PM |
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Mine is on the front line, but again, only beacause the wiring loom put it there
Doesnt matter what Sh*t life throws at you, there is always some other poor bugger worse off!!!!!
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britishtrident
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| posted on 13/3/05 at 11:38 AM |
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Bit of history -- front brakes only became popular after WW1 before about 1926 cars usually had a hand brake which operated band brakes on the rear
wheel and if you were lucky a foot operated transmission brake. Transmission brakes tend to be rather difficult to control ----- any one who has
driven a car of this period will know that a foot operated transmission brake is not for the faint hearted so most stopping was done more sedately
using the hand brake. When front brakes were introduced they either operated only on the front wheels or on both the front and transmission brakes.
For obvious stopping distance reasons when brake lights were fitted they were required to be connected so that they operated inconjunction with any
brake the operates on the front wheels (this included handbrakes such as on the old Commer/Dodge PB that operated on the front wheels).
This is one of the reasons why cars with a diagonal split hydraulic system always either have a mechanical type switch operating on the pedal or two
pressure switches wired in parallel (found on some VW Caddy models).
With a front/rear split system the strict definition is that a hydraulic type switch should be plumbed into the front circuit but SVA testers
don't seem to know this and in practice it makes little or no difference anyway
[Edited on 13/3/05 by britishtrident]
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britishtrident
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| posted on 13/3/05 at 11:46 AM |
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quote:
Originally posted by clbarclay
you could have a switch in both lines connetced to the brake lights, but also to 'exclusive OR' logic circuit to work a brake faliure
light on the dash board.
A light to tell the driver that his braking foot has just went to the floor ? I suspect the driver might have more on his mind than looking at
warning lights.
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clbarclay
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| posted on 13/3/05 at 05:28 PM |
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Unless i misread the SVA manual a light indicating of brake failure on hydraulic systems is requirement.
section 16.4
4 d.
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NS Dev
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| posted on 13/3/05 at 09:07 PM |
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not as long as there is a light warning of fluid loss in either circuit and it is a split circuit braking system.
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Danozeman
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| posted on 16/3/05 at 09:16 PM |
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Is this pressure switch a requirement then or can it be a pedal operated switch?
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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NS Dev
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| posted on 17/3/05 at 10:17 AM |
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No, don't worry, a pedal operated switch is fine, but as the brake lights will be switched directly, and I like the simple and minimal approach,
I want to use a 4 way tee piece at the rear of the car to split the lines to the two rear calipers and have the switch for the rear lights mounted on
it too, and incorporate it into the rear loom on it's way to the lights.
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RazMan
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| posted on 20/3/05 at 09:15 AM |
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Mine is in the rear brakes simply because it was the most convenient place to put it . That way I only need use two tee joints near the master
cylinders - one from the front m/c to the front calipers and one from the rear m/c to brake switch and long brake line to the rear of the car (which
then splits on another tee to the rear calipers.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Danozeman
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| posted on 20/3/05 at 10:04 AM |
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Could u not use a 4 way piece for this and put the switch where the split is for either side?
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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NS Dev
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| posted on 21/3/05 at 09:13 AM |
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quote:
Originally posted by Danozeman
Could u not use a 4 way piece for this and put the switch where the split is for either side?
yes, that's what I'm doing, 4 way t-piece at the back where the rear line splits.
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