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Brake caliper temperature


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Went to paint my calipers today and the finish has come out dreadful, the paint is so thin it just doesn't work, peed off tbh.

They are the original single pot brembo rear calipers, running red stuff ceramic and ventilated/grooved disks - what sort of temperatures should I expect the caliper to get to on the rear in normal use ?

As standard I am figuring not a lot becuase of the braking bias towards the front, but add grooves etc doesn't that channel a lot of heat away ?

I'm not tracking the car or doing a lot of hard braking.

The paint I'm using atm is safe for 500C / 900F

The paint I want to opt for is 300C / 570F

I was tempted to give it a go and see if it works or not, but becuase I can't start again until the sunday now I thought I'd throw it open for a 2nd opinion.

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No idea sorry - But Dermot painted his in RED. Came up nice. Don't know what he used. Did you go for the Halfrauds brake caliper paint ??

Been thinking about doing my rears as they are pretty cruddy.

Your webpage is coming along nicely. :P

Simon  (94 S4)      My Esprit will be for sale in late 2017

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bias on a std braked GT3 with brembos front and back is 1.19 to 1 F/R. so the rears are still doing plenty of work if all is well. my paint has started to fall off too as it happens. as for temperatures, well, I should think some decent high heat paint should be fine. what make stuff are u using?

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I was gonna try some POR-15 on it becuase it is so good, it can do upto 315C which I have confirmed by using a heat gun, it slighly bubbles and burns and that's it. Unless you're doing circuits I can't see that they're gonna get that hot (might be wrong).

The stuff I put on there today was VHT Caliper spray paint from Frosts, gonna complain I think. Might goto halfords tomorrow and have a look see what I can find and test some stuff out, if I find anything I'll post it up.

The rears are a pain to clean (gotta do one again now) if you did it right I reakon you could soak it in metal ready all the way around without getting any on the piston seals which would really help.

Let you know.

Edited by Jonathan

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Tried that POR-15 in the oven at 250c for about 30mins and it just turns gold, whilst it's not it's more susceptable to scratching off but once it cools it's the same old paint again.

The Elise runs the same brakes on the back (single pot brembos) and I tried doing some hard sustained braking and the calipers don't even get more than warm. I've painted 1 caliper so I'll let you know, if it dont work it's only money !

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The fronts will be the problem, u've only got to stop hard once and the temperature will be enough to melt most of your hand off, continued heavy stopping can cause the discs to get so hot they turn blue/gold and the calipers wont be a whole lot cooler.

Be interesting to see how they fare.

Chunky Lover

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I believe normal DOT 3/4 brake fluid boils at somewhere between 350-450 degrees F depending on if it is new and dry or old and wet.

The caliper temperature I would think would be well within the working range of the brake fluid to prevent fluid vaporisation which will result in the loss of brake pedal.

Given say a max of 350F in the fluid, I would guess the caliper outer surface would be a good deal less than that.

I would just use a good epoxy paint and to hell with the fancy stuff..

If you set no goals you shall surely reach them..

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I believe normal DOT 3/4 brake fluid boils at somewhere between 350-450 degrees F depending on if it is new and dry or old and wet.

The caliper temperature I would think would be well within the working range of the brake fluid to prevent fluid vaporisation which will result in the loss of brake pedal.

Given say a max of 350F in the fluid, I would guess the caliper outer surface would be a good deal less than that.

I would just use a good epoxy paint and to hell with the fancy stuff..

<{POST_SNAPBACK}>

good call

actually, while the disks get very hot, the calipers remain fairly cool.

the only contact point is the pads and they are not great thermal conductors.

the elastomers used for the seals have a working temp range less

than the fluid

chris

90SE

just because I don't CARE doesn't mean I don't UNDERDSTAND

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