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Discussion Starter #1
I took my Mazda 6 2.2d (2017 model) car in for MOT and service at MAZDA, but after passing MOT, the brake light appeared on the dashboard.
The service engineer said (thinks) that the brake reservoir float has got stuck, as the brake fluid is okay and no issue with brakes.
He said it will cost £600+ to replace the master brake reservoir cylinder which contains the float. He also said this may have been caused by the MOT brake test procedure.

Has anyone had this problem or know any
of any other reason that causes this issue or and more importantly how to free up this float?

Rob.
 

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There is no float that im aware of (my 3 doesnt have one i dont think), but the most common issue is the e-brake if its manual, is up slightly. If you have the electronic e-brake, then i would just kinda poke around if theres a float to dislodge it.

What is MOT and did a Mazda dealer do it? If so, make them fix their eff-up.
 

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Discussion Starter #3
The Mazda 6 is an automatic diesel. In the UK, all cars have to have a formal independent car inspection known as an MOT, every year after the vehicle is 3 years old. In the brake cylinder reservoir, the float is used to inform you the brake fluid is running low. However if it gets stuck, then the light on the dashboard is displayed indicator the fluid is low. If anyone knows about how to fix it without replacing the brake reservoir cylinder would be much appreciated? The e-brake light shows up separately on my dashboard, which appears to be working correctly.
 

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You should be able to see it. Remove the screen from the top of the reservoir (just lifts out) and see if you can GENTLY tap it from above with a clean implement of some sort. That may un-stick it.
 

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The Mazda 6 is an automatic diesel. In the UK, all cars have to have a formal independent car inspection known as an MOT, every year after the vehicle is 3 years old. In the brake cylinder reservoir, the float is used to inform you the brake fluid is running low. However if it gets stuck, then the light on the dashboard is displayed indicator the fluid is low. If anyone knows about how to fix it without replacing the brake reservoir cylinder would be much appreciated? The e-brake light shows up separately on my dashboard, which appears to be working correctly.
Man, I really wish we had this in Canada.
I see dozens of cars with pornstar bald tires on their cars.
A MOT inspection would make it safer for everyone.⁹
 

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Discussion Starter #6
Thanks for the comments and suggestions which I have tried out. It seems I will have to take it to the dealer garage for repairs. Ouch! Expensive option.
 

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Yeah if that doesn't help it's not stuck -- they likely damaged the sensor. Don't you love governments?
 
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