HI..
7 mm on the rear brakes if it's a german wheel cylinder.
( sometimes 1/4 inch if it's an american el cheapo )

10mm on the front brake calipers.

I always spray them with Kroil penetrating oil first thing..
as soon as I know I'm going to be unscrewing them

also ..in an extreme case of stuckness...tapping downward on the bleeder
screw with a small hammer may 'waken up' the treads, sometimes.  YMMV

  scott
turbovans

On 3/24/2012 8:30 AM, Bryan Feddish wrote:
> And BTW, what size wrench does the bleeder bolt take? I gone to 3 stores and nothing fits it.
>
> Thanks
> Bryan
>