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  1. #1
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    Default Mechanical Brake Switch Install

    I'd like to replace my rain light with a dual rain/brake system. I don't want to tap the brake line for hydraulic actuated switch. What systems have you guys figured out that works well with vintage formula brake pedals?

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  2. #2
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    Default

    I may be a bit confused about your post. On my sports racer, all I did was use a simple pressure-activated switch, mounted between the caliper and the brake line banjo fitting. Took 5 mins to install, works just fine. Think I got it from Pegasus....

    best,
    bt

  3. #3
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    Default Girling

    ** Actually I'll need to verify that. Currently up on the storage lift and I can't get to it **

    My vintage Girling Master doesn't use a banjo fitting. I either have to tap the hard line or install a mechanical switch.

    .

    Quote Originally Posted by billtebbutt View Post
    I may be a bit confused about your post. On my sports racer, all I did was use a simple pressure-activated switch, mounted between the caliper and the brake line banjo fitting. Took 5 mins to install, works just fine. Think I got it from Pegasus....

    best,
    bt
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    Last edited by scottjk; 05.07.24 at 1:39 PM.

  4. #4
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    Default maybe?

    look up "backup alarm switch". Typically a spring wand operating a micro switch.

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  6. #5
    Contributing Member Ken Lawrence's Avatar
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    Default Brake switch

    My GP Spitfire used a switch like this

    Beck/Arnley Stop Light Switch - 201-1105 from Amazon

    Had a small tab off the pedal in the linkage

    worked fine for years

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  8. #6
    Senior Member David Ferguson's Avatar
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    Default

    Steven Johnson used a reed (edit -- a mecury switch, closes when tilted) switch on Lola S2's, whenever the car slowed significantly, the switch activated turning on the brake light. You might need a magnet to turn it on for tech.
    Last edited by David Ferguson; 05.09.24 at 10:23 AM.
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  9. #7
    Contributing Member Garey Guzman's Avatar
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    I've never seen a Vintage Formula car (or any formula car) with a brake light so your question is puzzling. Common/required on Sports racers though.
    Garey Guzman
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  10. #8
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    Default Brake light

    I believe Sovren requires a brake lights on all cars including FF. Several good options for you to look at.

  11. #9
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    Default

    Quote Originally Posted by scottjk View Post
    ** Actually I'll need to verify that. Currently up on the storage lift and I can't get to it **

    My vintage Girling Master doesn't use a banjo fitting. I either have to tap the hard line or install a mechanical switch.

    .
    The Austin Healey Sprite uses a T fitting on the brake line and a pressure switch available from Moss Motors https://mossmotors.com/542-110-switc...ed-pipe-thread
    $10 or a mechanical switch from e- type Jag is available for $27 from Moss https://mossmotors.com/26-1005-brake...tch-mechanical

    Regards
    Paul

  12. #10
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    Default yes

    Quote Originally Posted by marchsv View Post
    I believe Sovren requires a brake lights on all cars including FF. Several good options for you to look at.
    Brake lights are required. We have not seen the brake plumbing at the master but it could be hard line plumbed using inverted flair. Why change something simple that works?

  13. #11
    Contributing Member scorp997's Avatar
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    Default

    Most of us at Sovren run a banjo bolt brake light switch. Easy to add to the rear master cylinder and can be disconnected electrically when you don’t need it. No springs or rods mounted around the pedals..

    https://www.pegasusautoracing.com/pr...asp?RecID=5028

    if you use one of these, use some silicone where the wires come out of the switch as they are easily pulled out..

    use this adapter if you have hardlines.
    https://www.pegasusautoracing.com/pr...asp?RecID=4195
    Flex line is a snap

    scott, talk to Tracy - he has done a lot of work with this group
    Last edited by scorp997; 05.08.24 at 12:25 AM.
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  14. #12
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    Default Steven Johnson (RIP) brake light switch

    Quote Originally Posted by David Ferguson View Post
    Steven Johnson used a reed switch on Lola S2's, whenever the car slowed significantly, the switch activated turning on the brake light. You might need a magnet to turn it on for tech.
    I recall reading that Steven also (actually?) used a mercury switch of the type that activates as it is tilted. One would need to adjust/calibrate the mounting angle so that a desired stopping deceleration rate (say 0.25g's) turns the switch on. Steven's intention was to avoid putting a pressure actuated switch in a brake line. His reasoning was that if not installed in the right orientation, they can retain an air bubble during bleeding & yield a soft brake pedal. A secondary effect would be that getting off the gas in a lowish gear ratio (or going down a steep hill) might turn on the brake light.

    Lee

  15. #13
    Global Moderator Mike B's Avatar
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    Default

    Quote Originally Posted by Lee Johnson View Post
    I recall reading that Steven also (actually?) used a mercury switch of the type that activates as it is tilted.
    This is also my recollection, I think I read it on the old S2000 board when it was active. I don't recall how he activated it in Tech, though.
    Mike Beauchamp
    RF95 Prototype 2

    Get your FIA rain lights here:
    www.gyrodynamics.net/product/cartek-fia-rain-light/

  16. #14
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    Default

    I used a small microswitch that has a soft spring lever that just bends after contact with the front side of the brake pedal.

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