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Aug 24th, 2023
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Joined: Dec 2008
Posts: 21,865 Likes: 167
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 21,865 Likes: 167 |
I think somebody cut one up, and the part which takes the brake pressure had distorted, and broken the electrical connection.
A relay will help the current problem but a microswitch on the pedal is an easy fix.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2007
Posts: 26,747 Likes: 419
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 26,747 Likes: 419 |
Agreed Jon the new ones are rubbish
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: Dec 2009
Posts: 35,773 Likes: 468
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 35,773 Likes: 468 |
Part of the problem is the poor quality of OE replacements, that's why +8 Richard's originals are still working That is making the assumption that it wasn't replaced before I took custody of her 7 years ago Jon, as such it is an unknown but possible  .
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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Joined: Feb 2016
Posts: 7,916 Likes: 216
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,916 Likes: 216 |
My brake lights stay on intermittently, I give the switch a gentle tap then light goes out.
Does anyone have a part # please?
I believe these switches aren’t very reliable, as an alternative has anyone tried mounting a micro switch off the brake pedal? Here is the part you requested Dave. Slaving a relay will remove the current factor from the hydraulic switch as John suggests, this makes them far less prone to failure. I have never had a failure on either of my Plus 8's in about 50,000mls and 11 years to put things in perspective for you. I would recommend avoiding adding the complexity of a relay to this safety critical circuit which will increase potential for unreliability. As John V6 suggests his failed even with low current LED brake lights so better to source a quality replacement switch.
Last edited by RichardV6; 02/08/21 11:05 PM.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Dec 2009
Posts: 35,773 Likes: 468
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 35,773 Likes: 468 |
My brake lights stay on intermittently, I give the switch a gentle tap then light goes out.
Does anyone have a part # please?
I believe these switches aren’t very reliable, as an alternative has anyone tried mounting a micro switch off the brake pedal? Here is the part you requested Dave. Slaving a relay will remove the current factor from the hydraulic switch as John suggests, this makes them far less prone to failure. I have never had a failure on either of my Plus 8's in about 50,000mls and 11 years to put things in perspective for you. I would recommend avoiding adding the complexity of a relay to this safety critical circuit which will increase potential for unreliability. As John V6 suggests his failed even with low current LED brake lights so better to source a quality replacement switch. You pay your money and take your choices is how I view it with my experience with them and slaving relays is a very common practise. I had the pedal mounted micro switch fail on my 2009 4/4 Sport at 10,000mls so neither system is failsafe without getting carried away.
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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Joined: Apr 2010
Posts: 463
Learner Plates Off!
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OP
Learner Plates Off!
Joined: Apr 2010
Posts: 463 |
I’m going to install a switch similar to the factory using the design from Geoffs Shed http://geoffsshed.net/mechanical_brake_light_switch.htmlAlready have LED lights but will also replace the PS with one made in USA. I would like to thank everyone for their help and encouragement this is what makes owning a Morgan so much fun. Cheers 🍺🍺
Dave
98 +8 Corsa Red
74 MGB Red
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Joined: Feb 2016
Posts: 7,916 Likes: 216
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,916 Likes: 216 |
My brake lights stay on intermittently, I give the switch a gentle tap then light goes out.
Does anyone have a part # please?
I believe these switches aren’t very reliable, as an alternative has anyone tried mounting a micro switch off the brake pedal? Here is the part you requested Dave. Slaving a relay will remove the current factor from the hydraulic switch as John suggests, this makes them far less prone to failure. I have never had a failure on either of my Plus 8's in about 50,000mls and 11 years to put things in perspective for you. I would recommend avoiding adding the complexity of a relay to this safety critical circuit which will increase potential for unreliability. As John V6 suggests his failed even with low current LED brake lights so better to source a quality replacement switch. . I had http://www.talkmorgan.com/ubbthread...nk-rear-suspension-re-visited#Post594455 pedal mounted micro switch fail on my 2009 4/4 Sport at 10,000mls so neither system is failsafe without getting carried away. With headlamp controls I would agree to save dipswitch contacts although less relevant to LED ones with their much reduced current draw. I can't recall any manufacturer that uses a relay in the brake switch circuit though and again LED conversions reduce contact burning issues to near zero. With electrics and maybe plumbing the KISS principle when possible seems to offer best reliability.
Last edited by RichardV6; 03/08/21 11:49 AM.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Nov 2015
Posts: 7,892 Likes: 241
Just barreling along Talk Morgan Guru
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Just barreling along Talk Morgan Guru
Joined: Nov 2015
Posts: 7,892 Likes: 241 |
I found Intermotor brand to be ok, beware of modern Lucas stuff in white & green boxes, a considerable amount is very poor ROC copies
Jon M
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Joined: Oct 2014
Posts: 528
Talk Morgan Regular
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Talk Morgan Regular
Joined: Oct 2014
Posts: 528 |
My brake lights stay on intermittently, I give the switch a gentle tap then light goes out.
Does anyone have a part # please?
I believe these switches aren’t very reliable, as an alternative has anyone tried mounting a micro switch off the brake pedal? Here is the part you requested Dave. Slaving a relay will remove the current factor from the hydraulic switch as John suggests, this makes them far less prone to failure. I have never had a failure on either of my Plus 8's in about 50,000mls and 11 years to put things in perspective for you. I am resurrecting this thread because next week my car goes in for its MOT and I have just discovered that none of my three brake lights are working so I am assuming its the brake pressure switch. In quote Rich has quoted the replacement part for 1975 to 2005. My car is a Plus 4 first registered in Sept 2006. Anybody know the correct part number for 2006 on?
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Joined: Jul 2007
Posts: 26,747 Likes: 419
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 26,747 Likes: 419 |
To test if it is the switch remove the leads and then connect a wire across the leads. With the ignition on the brake lights should be on.
I would expect your switch to be as the 2004 car.
You can if you are quick remove and replace the switch without needing to bleed the brakes.
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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