Rear brake locking up

["Scott McKorkle" <bmc@aa.net>]

I noticed a minor problem yesterday with my 78B.  When braking to a stop at
slow speed, the left rear wheel is locking up, causing it to chirp against
the pavement.  This is noticeable with anything more than light braking
pressure applied.  I don't notice anything when braking at speed.  I
adjusted the rear brakes, but the problem hasn't gone away.  I plan to dig
into this tonight, but wanted to check your combined wisdom for any
pointers beforehand.

Thanks!
Scott McKorkle
1978 MGB