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Brake warning light on dual circuit bias setup?
cloudy - 20/1/08 at 11:52 PM

Can't find this info anywhere...
Will I need a sensor for both reservoirs? Or just front?

Also are there any suitable integral reservoirs for SVA?

Thanks All

James

[Edited on 20/1/08 by cloudy]

blakep82 - 21/1/08 at 12:04 AM

i'd wondered about this too... I'm going to have 2 of everything, 2 master cylinders, 2 sensors, and 2 warning lights,
that way, if you do get a failure of one circuit, it will tell you which

RazMan - 21/1/08 at 05:33 AM

That's a tricky one and technically I suppose you need to have a warning on both reservoirs. Better still, if you can have one reservoir for both brakes and the clutch, then all your bases are covered with one warning switch.

MikeRJ - 21/1/08 at 06:59 AM

If you are using a remote reservoir with twin master cylinders then use one of the proper reservoirs that have one level switch and a divider between front and rear sections to stop a leak in one totaly draining the other.

iank - 21/1/08 at 07:53 AM

Yes, if using separate reservoirs for front and rear brakes you need two switches - but you can (should?) wire them in series and only have one light/test switch - doesn't matter which ones leaking the light is there to tell you to stop immediately, diagnostics should be easy just by looking at which reservoir is below min.

Clutch cylinder doesn't need a warning light.

02GF74 - 21/1/08 at 10:15 AM

quote:
Originally posted by iank
Yes, if using separate reservoirs for front and rear brakes you need two switches - but you can (should?) wire them in series and only have one light/test switch - doesn't matter which ones leaking the light is there to tell you to stop immediately, diagnostics should be easy just by looking at which reservoir is below min.

Clutch cylinder doesn't need a warning light.


should be in parallel to make OR function; lamp is on when either one of the switches is closed.

I have a similar set up with the reservoir and handbrake switches.

iank - 21/1/08 at 10:32 AM

quote:
Originally posted by 02GF74
quote:
Originally posted by iank
Yes, if using separate reservoirs for front and rear brakes you need two switches - but you can (should?) wire them in series and only have one light/test switch - doesn't matter which ones leaking the light is there to tell you to stop immediately, diagnostics should be easy just by looking at which reservoir is below min.

Clutch cylinder doesn't need a warning light.


should be in parallel to make OR function; lamp is on when either one of the switches is closed.

I have a similar set up with the reservoir and handbrake switches.


you are quite right. I had it in my head that the switches opened on fail. my bad.

cloudy - 21/1/08 at 05:14 PM

Thanks guys, so basically I need to have remote reservoir(s) to be able to have warning sensors....

iank - 21/1/08 at 05:29 PM

If you use a manufacturer reservoir it will have the switch without being remote, also you can get caps with switches for the cylinders with integral reservoirs. Rally design sell a switch for willwood reservoirs (looks a bit of a hack as it looks like you have to drill the cap)
CBS sell one that looks nice though.
Bottom product on this page
http://www.carbuildersolutions.co.uk/master_cylinders.htm

cloudy - 22/1/08 at 08:18 AM

nice find! They should do nicely

James