could be the pads are sticking. put some copper grease behind them are on the slide bar. Also it's not a 'pro' job, just takes a little time and patience.
Simon
> > Hi
> >
> > I changed my front brake pads last Saturday and everything went fine.
> > However now when I'm reversing and I put my foot on the brake, I get a > loud
> > almost high pitched (sounds a bit like a chair being dragged across the
> > floor) sound.
> >
> > Any ideas what this could be? Would it be something to do with the front
> > pads I changed? Do I need to oil/grease them or something? I never
> > applied any additional lubricant to the pads or parts etc.
> >
> > Or could this indicate a problem with my rear brakes now?
>
> The fact that you don't know should give you the clue that you shouldn't
> have done the job yourself. Brakes are kind of important.
>
> yes you need to lubricate behind the pad. also you may have needed to
> change the guide pins on the calipers. The clunk/binding is quite common,
> but can be fixed by someone who knows what they're doing.
>
> It's not a job I'm a 100% confident about, that's why I always get a pro to
> do my brakes.
>
>