Brakes very hot

[keving1]

I noticed at the weekend that all the 4 brakes on my 35i were very hot after a gentle 4 mile drive, over 100 degrees centigrade .

Is this normal as I haven't noticed this before (or maybe not checked before)? No warning lights or fault codes.

[Smartbear]

I noticed at the weekend that all the 4 brakes on my 35i were very hot after a gentle 4 mile drive, over 100 degrees centigrade .

Is this normal as I haven't noticed this before (or maybe not checked before)? No warning lights or fault codes.

You say gentle, are there many downhill sections or junctions on your route?
I don’t think it would take much use to get the brakes that warm
Rob

[keving1]

I would have braked gently about 20 times from 30-40mph each time.

[Busterboo]

How did you measure them?

[keving1]

I was in the middle of washing the zed when I had to go out to get something for the wife and when I came back washed the wheels, with the water being sprayed on the discs turning to clouds of steam

[RustyZ4]

If its a manual, have you tried just cruising in neutral to see if the brakes are binding? if not it could be just its so bloody hot at the moment, I had a dust covering on my car, so thought I would rinse it off, there was steam coming off my car and no I had not driven it.

[Busterboo]

I was in the middle of washing the zed when I had to go out to get something for the wife and when I came back washed the wheels, with the water being sprayed on the discs turning to clouds of steam

So, not with a pyrometer, then.

[Silverzedtom]

All sounds normal to me

[keving1]

All sounds normal to me

Thanks for the replies, looks like all is normal.

[keving1]

I was in the middle of washing the zed when I had to go out to get something for the wife and when I came back washed the wheels, with the water being sprayed on the discs turning to clouds of steam

So, not with a pyrometer, then.

No using Science, water boils and turns to steam at 100 degrees centigrade

[Busterboo]

I was in the middle of washing the zed when I had to go out to get something for the wife and when I came back washed the wheels, with the water being sprayed on the discs turning to clouds of steam

So, not with a pyrometer, then.

No using Science, water boils and turns to steam at 100 degrees centigrade

Indeed, it does. Indeed, it does. That is not a measurement, however, of the temperature of your discs.

[keving1]

So, not with a pyrometer, then.

No using Science, water boils and turns to steam at 100 degrees centigrade

Indeed, it does. Indeed, it does. That is not a measurement, however, of the temperature of your discs.

What is it a measure of then, as the heat is produced by the discs and pads

[TomK]

I have measured my discs at 620c, this will also turn water into sream

[ihadablackdog]

If we’re going to be pedantic, the op didn’t say they were 100 degrees...he said they were over 100 degrees.

Regardless, the question he is asking is, should the brakes get hot enough to turn water to steam?

[Busterboo]

OP, TomK's post is the best answer in this thread.

Discs & the surfaces of pads can become very hot - a long way above 100C - and, yes, they'll turn water to steam.