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PostPosted: Mon Feb 04, 2019 5:33 pm 
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Joined: Mon Oct 15, 2018 3:52 pm
Posts: 60
Car Model: 99
Does anyone know how the switch works for the brake warning light?
I understand the concept that it somehow "detects excessive pedal movement" but it just seems to be a bit of metal that slides, with no spring/connection etc. The brakes appear to work okay, but the light is on, and I'm wondering if that switch is broken/wrong somehow...
This is the switch that's in the passenger footwell next to the brake-light switch, rather than being something in the master cylinder...


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PostPosted: Mon Feb 04, 2019 6:34 pm 
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Joined: Tue Mar 07, 2006 9:24 am
Posts: 3679
Location: Bristol
Car Model: All
If you have had excessive travel of the pedal, then you need to grip the top of the switch and pull it back up and this will reset it.

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PostPosted: Mon Feb 04, 2019 6:58 pm 
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Joined: Mon Oct 15, 2018 3:52 pm
Posts: 60
Car Model: 99
Thanks- will take a look. It's weird as the slidey bit appears to have no connection to the pedal, and in fact the pedal moves away from it when pressed... seems odd!


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PostPosted: Tue Feb 05, 2019 9:27 am 
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Joined: Tue Oct 30, 2007 9:26 pm
Posts: 6152
Location: North Essex
Car Model: 900Ruby,vert, 9000, 99, Sonett
When working properly the brake warning light on an early 99 comes on for two reasons.

1) It should come on when the hand brake is applied.
2) The brake is a split hydraulic system. One line operates the front right and the rear left the other operates the front left and the rear right. There is a sensor in the system that senses when there is a different pressure in each of the brake lines. When there is a pressure difference the warning light comes on. The sensor is located on the master cylinder.

If the light stays on, it could be either the handbrake switch needs adjusting, a fault in one of the brake lines or a faulty sensor on the master cylinder.

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