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Brake Test Switch Wires?


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#1 ReeceWillett

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Posted 23 May 2019 - 04:10 PM

How do all. One final problem before my MOT. It seems the brake test switch doesn't work and hasn't since I've owned the mini. The wires are in tact on the switch. But on the fluid reservoir there is nothing connected... But I do have these wire hanging around near it. I've tried connecting it up but nothing happens? Are the other two wires supposed to be hooked up as well ???

Cheers guys


Mini city E
1983
998cc

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#2 unburntfuelinthemorning

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Posted 23 May 2019 - 04:15 PM

On older master cylinders there was a sensor lower down but on later ones the wires connect to the lid and needed a little modification to work.  It's in the supplement of the Haynes Workshop Manual.  I'd have a look but we're off out to vote now.



#3 ReeceWillett

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Posted 23 May 2019 - 04:47 PM

On older master cylinders there was a sensor lower down but on later ones the wires connect to the lid and needed a little modification to work.  It's in the supplement of the Haynes Workshop Manual.  I'd have a look but we're off out to vote now.


Cheers but I can't seem to find anything in my Haynes manual???

#4 unburntfuelinthemorning

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Posted 23 May 2019 - 05:19 PM

Might depend on you particular manual. 

 

In mine it's Chapter 14 (Supplement) Section 13 (Braking System) under the heading "Brake master cylinder - revised front/rear split" reading from paragraph 23.


Edited by unburntfuelinthemorning, 23 May 2019 - 05:20 PM.


#5 ReeceWillett

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Posted 23 May 2019 - 05:31 PM

Might depend on you particular manual. 
 
In mine it's Chapter 14 (Supplement) Section 13 (Braking System) under the heading "Brake master cylinder - revised front/rear split" reading from paragraph 23.


Bugger I've only got 12 chapters!!!!

#6 phillrulz

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Posted 23 May 2019 - 07:43 PM

Mines never worked and never been picked up on the MOT, chances are the only rockers they press is hazards, lights and fog. 



#7 Dusky

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Posted 23 May 2019 - 08:02 PM

Not having that working would leave you stranded with a seized car over here.

#8 unburntfuelinthemorning

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Posted 23 May 2019 - 08:42 PM

I've had a look at it properly now, sorry it took a while.  It's quite simple:

 

1. Try earthing each of the black/white wires in turn - just touch them to the master cylinder body.  One of them should cause the brake warning light to illuminate.

 

2.  Join the two black/white wires together, press the brake warning switch, the warning light should illuminate.

 

3.  Connect the two black/white wires to one side of the filler cap.

 

4.  Connect the other side of the filler cap to earth.

 

5.  Unscrew the filler cap and raise it a inch or two to simulate low fluid.  The light should now illuminate.


Edited by unburntfuelinthemorning, 23 May 2019 - 08:46 PM.


#9 unburntfuelinthemorning

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Posted 23 May 2019 - 08:46 PM

 

Might depend on you particular manual. 
 
In mine it's Chapter 14 (Supplement) Section 13 (Braking System) under the heading "Brake master cylinder - revised front/rear split" reading from paragraph 23.


Bugger I've only got 12 chapters!!!!

 

Have you got one of the newer ones?



#10 Bobbins

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Posted 24 May 2019 - 04:52 AM

Not having that working would leave you stranded with a seized car over here.

Not having that working would leave you stranded with a seized car over here.


Can you elaborate?

#11 unburntfuelinthemorning

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Posted 24 May 2019 - 06:59 AM

 

Not having that working would leave you stranded with a seized car over here.


Can you elaborate?

 

I think he must mean the rules are stricter in Belgium and not that parts would stop moving.



#12 Ethel

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Posted 24 May 2019 - 09:15 AM

From the piccy, your fluid level is low or the cap is fubar. That little dibber in the middle is part of the float and should stand proud of the cap. Pressing it tests the warning light.

 

...second glance, unless the cap's just unscrewed  :blink:



#13 Bobbins

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Posted 24 May 2019 - 09:36 AM

 

 

Not having that working would leave you stranded with a seized car over here.


Can you elaborate?

 

I think he must mean the rules are stricter in Belgium and not that parts would stop moving.

 

 

That's why I was asking ... re: Belgium.



#14 ReeceWillett

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Posted 24 May 2019 - 09:49 AM

I've had a look at it properly now, sorry it took a while. It's quite simple:

1. Try earthing each of the black/white wires in turn - just touch them to the master cylinder body. One of them should cause the brake warning light to illuminate.

2. Join the two black/white wires together, press the brake warning switch, the warning light should illuminate.

3. Connect the two black/white wires to one side of the filler cap.

4. Connect the other side of the filler cap to earth.

5. Unscrew the filler cap and raise it a inch or two to simulate low fluid. The light should now illuminate.


Thanks for this. I'll try it after work!!

#15 gazza82

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Posted 24 May 2019 - 10:16 AM

Check it's the correct cap as well ...






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