CHanged rear discs and pads .. are my discs binding ?

Depends entirely on use. I've seen some glowing in the dark after enthusiastic driving.

You've missed some words out of your post, e.g. 'not', but I assume your friend said that the discs should not get hot at all. Well, they will. In fact, in some high performance cars they will glow red hot after a hard braking. Many discs have ventilation slots in them to help to cool them.

How did you know your discs were hot? Did you touch them? Have you tried touching discs on another car? Have you considered where the kinetic energy of a car travelling at say 60 mph will go when it's brought to a halt by two surfaces rubbing together? I'm sure your discs are OK.

Rob Graham

It really varies by car. In a mk.2 Golf, at least the ones I've had, they don't seem to do much at all, and barely get warm, ever.

But in general I'd expect them to get pretty warm, and certainly too hot to touch after a spirited drive. Nothing like as hot as the fronts, though.

Rob

Peter smith wrote on 18/08/2009 :

As you obviously know, the disks and pads convert the cars kinetic energy, directly into heat, to slow you down. Disks are designed to get red hot/glowing, if used hard.

If you are still unsure - drive the car a few miles, let the car come to a stop without need to use the brakes at all (an up hill section will help) then check the disks. They should all be cold.