Thoughts on brake imbalance

[Crimson Tears]

Was wondering if anybody had any experience with rectifying brake imbalance. Basically, if I hit the brakes hard it will pull right and lock the right front wheel. Tyres are a matched set.
I've machined discs, rebuilt the caliper slides, and flushed the brake fluid. There is no grease etc on the rotor or pad surface. The vehicle has also had a wheel alignment.
I didn't replace pads, so my only thoughts to the problem are:
Sticky caliper piston
LH side pad not making full contact on rotor (due to the way it is worn)
Proportioning valve problem

Any thoughts would be much appreciated.

[themaleman]

i had to replace my 'proportion valve' once for a warent. my car wasnt breaking evenly on both sides

[l1ttle_d3vil]

generally the proportionary valve is to balance the front vs rear brakes...
check any splitters for leaks etc too.

[Bling]

If the pads aren't worn evenly I would have thought that could affect the performance. If a pad is only half contacting on the disc compared to the otherwise etc.

[mjrstar]

i had a similar problem and i ended up cycling the pistons in and out 6 or 7 times and it cured the problem.. you just need a block of wood to stop the piston coming out too far...