Brakelight Switch Replacement

Discuss mechanical problems here.
Myrtles Man
Minor Addict
Posts: 727
Joined: Wed May 16, 2018 10:49 pm
MMOC Member: Yes

Brakelight Switch Replacement

Postby Myrtles Man » Sun Jul 12, 2020 10:41 am

Just discovered that I've inadvertently been driving around for lord knows how long with inoperative brake lights. Oops! Fortunately, the brakes on my car have been so incredibly feeble (I've now replaced comprehensively seized cylinders and renewed the brake shoes) that no following driver would have been in the slightest danger of rear-ending me (since acquiring the car I've re-developed forward-observation and anticipation skills that would be the envy of a cobra-fighting mongoose!)

Anyway, thing is, I've established that it's the brakelight switch letting the side down and I have a new one on order. What I'm hoping for here is words from the wise about how to go about the removal and replacement process without getting air into the system and having to do (yet another!) all-round bleeding brake-bleeding exercise. How do the old pro's go about it?

newagetraveller
Minor Fan
Posts: 352
Joined: Wed Feb 13, 2002 12:00 am
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby newagetraveller » Sun Jul 12, 2020 11:47 am

As long as you unscrew the old one carefully and screw the new one in right away without pressing the brake pedal there shouldn't be a problem.

simmitc
Moderator
Moderator
Posts: 3865
Joined: Thu Apr 15, 2004 9:43 am
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby simmitc » Sun Jul 12, 2020 3:54 pm

As above, it should not be a problem, but unscrewing the old one can be. Make sure that you support the union to stop it twisting. A deep socket or box spanner is the best tool to hold the switch.

Have your brakes been modified in any way? Discs, servo, remote fluid reservoir? These can make the job even easier, but it's always worth checking when talking about brakes. Before fitting the new switch, hold it upside down and dribble or inject clean fluid into it, then keep your finger over the hole until the very last second as you fit it. Surface tension will hold the fluid in there for a moment and prevent air getting trapped in the switch.

paul 300358
Minor Fan
Posts: 339
Joined: Thu May 11, 2017 8:23 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby paul 300358 » Sun Jul 12, 2020 5:01 pm

Before starting, cover the top of the master cylinder with cling film. Also, get everything ready and prepared.

Myrtles Man
Minor Addict
Posts: 727
Joined: Wed May 16, 2018 10:49 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby Myrtles Man » Sun Jul 12, 2020 5:38 pm

Thanks all for your helpful responses. Seems more straightforward than I'd feared. The brakes are still standard Minor fare with no additions. I like the tip about filling the switch with fluid first simmitc as, from a Rob Thomasson article a few years ago, it seems it's quite possible for an air bubble to lurk in the top of the switch. If that were to happen, presumably there's no easy way of directly bleeding it out. Would having the front wheels up in the air on ramps before changing the switch over be worth doing? I'd already picked up the clingfilm tip Paul but thanks for ensuring that I knew about it, it's appreciated.

JOWETTJAVELIN
Minor Legend
Posts: 2339
Joined: Mon Dec 12, 2011 7:20 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby JOWETTJAVELIN » Sun Jul 12, 2020 6:44 pm

There is a useful Lucas gadget called a Stop Lights Indicator which serves two purposes; first it proves your brake lights are working and secondly it warns of bulb failure or total failure. I have one of these fitted to my cars. Otherwise the time-honoured method of checking they operate by looking at reflection in a shop window still works.
Image

jagnut66
Minor Legend
Posts: 2655
Joined: Fri Apr 11, 2008 7:28 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby jagnut66 » Sun Jul 12, 2020 6:55 pm

There is a useful Lucas gadget called a Stop Lights Indicator
Sounds interesting, I haven't heard of this before and an internet search doesn't bring it up, do you have a picture or a link to one?
Many thanks,
Mike.
1954 Series 2 on axle stands needing more welding......

Online
geoberni
Minor Legend
Posts: 1496
Joined: Fri Aug 04, 2017 11:19 am
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby geoberni » Sun Jul 12, 2020 8:07 pm

There's some currently on ebay: https://www.ebay.co.uk/itm/Lucas-33178- ... SwUCdexUO2

I can't readily explain why there are 3 terminals on them* :-? , but basically any small indication lamp, supplied from the down circuit side of the brake switch, will tell you if it's working or not.
if you want to know if the actual Stop lamps are working, rather than just the Brake switch, then you need a small bulb in-line with the Stop lamps, so that it is earthed via the Stop Lamp.
As the saying goes, 'not rocket science'. :wink:

*it might possibly be configured so that it would tell you if 1 of the 2 lamps was faulty, but that's beyond the traditional vintage/classic that only has a single wire running to the Stop lamps.
Basil the 1955 series II

Image

shoebone
Minor Fan
Posts: 118
Joined: Wed Feb 06, 2008 5:01 pm
MMOC Member: No

Re: Brakelight Switch Replacement

Postby shoebone » Mon Jul 13, 2020 4:51 pm

Could I just say ..........Most reproduction brake light switches appear to be made in far away places and can quickly fail, while you're in the area I can recommend the fitting of a relay, this will greatly increase switch life and as a small bonus, with the engine not running I can hear the click of the relay when the brake pedal is depressed. I fitted my relay probably two years ago and so far so good, car is my daily driver. Information regards relay fitment was found through the search function

Myrtles Man
Minor Addict
Posts: 727
Joined: Wed May 16, 2018 10:49 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby Myrtles Man » Mon Jul 13, 2020 5:10 pm

Many thanks Shoebone for that heads up. I've now dug out the two issues of Minor Matters that contain the article referred to and will crack on and order a suitable relay. :D

neilmorey
Minor Fan
Posts: 109
Joined: Fri Aug 09, 2013 7:58 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby neilmorey » Mon Jul 13, 2020 9:56 pm

I read some where ages ago that the VW switches were better quality than the Lucas ones for the Minor so I ordered one of these from ECP. Price has doubled in last 5 yrs.

https://www.eurocarparts.com/search/464630010

Used in conjunction with LED bulbs which reduces the current being drawn.

Myrtles Man
Minor Addict
Posts: 727
Joined: Wed May 16, 2018 10:49 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby Myrtles Man » Tue Jul 14, 2020 9:20 am

I've already ordered an 'Intermotor' switch Neil, which, with shoebone's suggestion of a relay (also on its way), will hopefully resolve the issue but thanks anyway for the suggestion.

Myrtles Man
Minor Addict
Posts: 727
Joined: Wed May 16, 2018 10:49 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby Myrtles Man » Wed Jul 22, 2020 8:30 am

Replacement switch and relay now fitted and brake lights working. Thanks everyone. :D

shoebone
Minor Fan
Posts: 118
Joined: Wed Feb 06, 2008 5:01 pm
MMOC Member: No

Re: Brakelight Switch Replacement

Postby shoebone » Thu Jul 23, 2020 4:46 pm

Well done, always a good thing when a plan comes together :D

JOWETTJAVELIN
Minor Legend
Posts: 2339
Joined: Mon Dec 12, 2011 7:20 pm
MMOC Member: Yes

Re: Brakelight Switch Replacement

Postby JOWETTJAVELIN » Fri Jul 31, 2020 6:49 pm

jagnut66 wrote:
Sun Jul 12, 2020 6:55 pm
There is a useful Lucas gadget called a Stop Lights Indicator
Sounds interesting, I haven't heard of this before and an internet search doesn't bring it up, do you have a picture or a link to one?
Many thanks,
Mike.
https://www.ebay.co.uk/itm/LUCAS-STOP-L ... SwkjJcTeMI

This is the one I have fitted, but not to my Minor.
Image


Who is online

Users browsing this forum: les and 4 guests