Brake Warning Light

[DreamCar]

This brake warning light below, is it always related to pads and discs or can it be brake fluid as well? Front pads are booked in for replacement but wondered if brake fluid may need changing.

Also in the colder weather often temp guage sits one below 80, does this mean coolant temp sensor or thermostat is on way out or normal in the colder weather? It's e270 CDI.

 

[DSM10000]

The wear indicator can only monotor the brake pads.

The disc thickness needs to be measured and they need replacing on average every other pad change. The minimum disc thickness is stamped in to the disc surface.

Brake fluid should be changed at the recommended service interval which should be in your vehicle handbook. Any competent garage should be able to test it. Do you know when it was last changed?

The low temperature reading suggests a failing thermostat, was this reading taken after at least 10 miles of running?

 

[GeorgeR]

Break warning designed to come up when the pad has 4 mm left. (After apx 80% use)
The break fluid is to be renewed every 2nd year or 33k miles as MB service plan.

 

[Smiley]

Thermostats are cheap for these cars, just buy the stat itself no need for a new housing. It will improve fuel economy and ensure that the engine is running as well as possible.

 

[DreamCar]

The wear indicator can only monotor the brake pads.

The disc thickness needs to be measured and they need replacing on average every other pad change. The minimum disc thickness is stamped in to the disc surface.

Brake fluid should be changed at the recommended service interval which should be in your vehicle handbook. Any competent garage should be able to test it. Do you know when it was last changed?

The low temperature reading suggests a failing thermostat, was this reading taken after at least 10 miles of running?

I think even after thirty miles it is still dipping one notch under 80 then popping back up. It's booked in for few bits so il ask them to change thermostat too. It doesn't need coolant temp sensor at same time like my Audi did when changing thermostat?

 

[DreamCar]

Break warning designed to come up when the pad has 4 mm left. (After apx 80% use)
The break fluid is to be renewed every 2nd year or 33k miles as MB service plan.

Thank you, brake fluid definitely needs doing then.

 

[GeorgeR]

Thank you, brake fluid definitely needs doing then.

Buy and bring a litre of DOT 5 / 5plus (check your spec) to save a few tenner.

 

[Smiley]

I think even after thirty miles it is still dipping one notch under 80 then popping back up. It's booked in for few bits so il ask them to change thermostat too. It doesn't need coolant temp sensor at same time like my Audi did when changing thermostat?

No need to change the sensor.
Brake fluid change interval is pretty standard at 2 yrs recommended by most manufacturers. Most cars older than 5 years probably get the fluid changed once in a blue moon when other brake work is being done. If you don't know when it was last changed then test it and see what it is like - or just change it anyway. You don't need to pay the extra for dot 5, dot 4 is what is specified for your car.
You will get a red light on the dash if the fluid is low but the car does not monitor the water content.

 

[DreamCar]

Thermostats are cheap for these cars, just buy the stat itself no need for a new housing. It will improve fuel economy and ensure that the engine is running as well as possible.

Had work done on the car yesterday but Mercedes have the thermostat on back order so they said I can buy an aftermarket one and they will fit for me. Does this look right if I don't need the housing:

https://www.autodoc.co.uk/mahle-original/18123700

Suggests it fits my E270 CDI, ECP only have one brand available that I don't think is great.

 

[Petrol Pete]

Had work done on the car yesterday but Mercedes have the thermostat on back order so they said I can buy an aftermarket one and they will fit for me. Does this look right if I don't need the housing:

Is this a first ? an MB dealership workshop that is willing to fit aftermarket non MB parts sourced by the customer ? Genuine question .

 

[DreamCar]

No, garage is not main dealer but uses OEM parts from Mercedes and thermostat is on back order.

 

[Smiley]

Had work done on the car yesterday but Mercedes have the thermostat on back order so they said I can buy an aftermarket one and they will fit for me. Does this look right if I don't need the housing:

https://www.autodoc.co.uk/mahle-original/18123700

Suggests it fits my E270 CDI, ECP only have one brand available that I don't think is great.

Yes that looks like the right one. It's also available from UK sellers on ebay so might arrive more quickly. I think that Mahle is the original equipment manufacturer. I also understood that the thermostats are not on back order from MB but are "no longer available" as a part from MB.

 

[DreamCar]

Yes that looks like the right one. It's also available from UK sellers on ebay so might arrive more quickly. I think that Mahle is the original equipment manufacturer. I also understood that the thermostats are not on back order from MB but are "no longer available" as a part from MB.

Will get it ordered, thank you.

 

[Trickythemerc]

Just change the stat complete with housing, temp sensor and gasket........... Job done

 

[DreamCar]

Does anyone know how long it will take to change the thermostat, assuming mb specialist doing it?