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Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
Brake light switch operation

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Brake light switch operation
wild_willy Offline
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Joined: Sep 2017 Posts: 79 Threads: 12
Reputation: 1
Location: Melbourne
#1
16-07-2023, 09:12 AM
Could some one please let me know if the brake light switch is operated by a spring connected to the brake pull rod or is it a different arrangement altogether. A spring seems to need to be a fairly strong one with more pedal travel required than I would like. The switch is the standard Lucas type and has been reconditioned.
 I thought it was a spring originally but maybe not.
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Ivor Hawkins Offline
Mechanically sympathetic
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Joined: Aug 2017 Posts: 1,647 Threads: 23
Reputation: 15
Location: The village of Evenley
Car type: 1934 Austin Seven RP Deluxe
#2
16-07-2023, 09:15 AM
Mine has a spring and it’s easy to adjust by loosening the clamp on the brake rod and tightening up when you have enough travel to switch the brake lights on.
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Graham Barker Offline
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Joined: Feb 2021 Posts: 292 Threads: 31
Reputation: 3
Location: New Zealand
Car type: Austin 7 Ruby 1938
#3
16-07-2023, 10:43 AM
My 1937 Ruby has a brake light switch pulled "on" by a spring attached to a brake as described by Ivor. Another spring inside the switch returns the switch to the "off" position when the brake pedal is released.
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wild_willy Offline
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Joined: Sep 2017 Posts: 79 Threads: 12
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Location: Melbourne
#4
16-07-2023, 09:49 PM
OK a spring it is then. Thanks for the replies.
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falcott Offline
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Joined: Nov 2023 Posts: 113 Threads: 11
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Location: New Zealand
Car type: 1936 A7 Special
#5
29-10-2024, 03:39 AM
Apologies for resurrecting a dead thread, but I wish to ask about the strength and type of spring for a '36 Ruby. The one that is fitted seems somewhat weak, and makes/breaks contact once it is adjusted to actually work. Is it possible that someone can take a photo of what works for them please? I also don't wish to have a spring that is too strong. Thanks for your help.
Cheers, Geoffrey
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Peter Naulls Offline
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Joined: Aug 2017 Posts: 864 Threads: 74
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#6
29-10-2024, 08:48 AM
This is not an original spring but it works. It is 16swg wire and 5/16" outside diameter.

No comments about the state of my car please!

   
http://www.peternaulls.co.uk
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Ivor Hawkins Offline
Mechanically sympathetic
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Joined: Aug 2017 Posts: 1,647 Threads: 23
Reputation: 15
Location: The village of Evenley
Car type: 1934 Austin Seven RP Deluxe
#7
29-10-2024, 09:54 AM
Lovely Peter, it shows that it’s being used!
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Pearls not a Singer Offline
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Joined: Aug 2017 Posts: 131 Threads: 11
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Location: Herefordshire
#8
29-10-2024, 06:44 PM
It should always have a spring in the connection. This ensures that when braking in extremity the brake pedal application is not limited by the switch travel and/or the switch is not destroyed by massive force. The internal spring in the switch is weaker as it only needs to overcome the weight of the pedal after the size 12 boot has been removed.
David
https://vintageman.zenfolio.com/
https://vintageman.zenfolio.com/
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falcott Offline
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Joined: Nov 2023 Posts: 113 Threads: 11
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Location: New Zealand
Car type: 1936 A7 Special
#9
31-10-2024, 03:15 AM
Thanks guys. The spring on my car seems somewhat weaker than the spring inside the switch, so it needs long travel (of brake pedal) to activate it.
Cheers, Geoffrey
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