R129 brake back-plates

[Stegel]

The rear calipers of my SL500 are not great (from an efficiency point of view) and I'm planning on rebuilding / replacing them (I'll decide when I remove them from the car). The backing plates are pretty rusty - I haven't checked if they are still available from MB but on the basis factory paint may not be that great, I'm going to clean the existing up while I have the calipers etc. off the car. I plan on having them blasted to remove rust and then either have them powder coated or use a high temperature paint. My question is how hot do the back plates get, and is powder coating going to survive there?

Thanks.

Edited by Stegel on Friday 3rd February 10:37

[PositronicRay]

You know I don't think the backplates get that hot, especially the rears. Hammerite stays stuck to the disc "top hats" so I think you'll be fine.

Are you sure the calipers are the problem? Knackered calipers tend to stick on, efficiency is more down to pads, discs and fluid.

[Stegel]

Ray, thanks. I'll get them powder coated.

Thanks for the advice - it had new disks and pads not many miles ago (but quite some time ago, before I bought it early 2015) and I've flushed and bled the brakes. Before I replace or rebuild the calipers I'll have a play around with hoses etc., but I think a piston or two has corroded and stuck limiting travel.

[Hereward]

They won't get hot enough to cause a problem with any coatings.

I have recently purchased a brand new rear pair, they come painted black and I am going to give them another coat of Hammerite metal paint before fitting.

[Stegel]

Thanks - I'll see how bad they are when they're off the car, and if too far gone I will replace - I may still go powder coat for robustness.