Testing a Proportioning Valve?

Hey guys,

Sorry for the delay on this, I had a minor surgical procedure done on my eye so I was down for a while. Side note: getting needles in your eye sucks.

The amount of information you guys can provide is amazing. First, it's helpful to know that I'm not even talking about the proportioning valve! So the safety switch is not my issue and I'll be leaving it alone. My rear brakes lock up under hard braking, but under no circumstances do I ever feel like I'm getting enough braking pressure to the front brakes. The pedal feel is very weird, too. The amount of pedal travel is fine, then it gets super hard and pretty much all the braking is done within a quarter inch of travel. The level of braking is more about the pressure I put on the pedal, rather than how far I push the pedal down (because it gets super hard and won't go any farther down).

Like trapster, if I drag the brake for a little while and then try to stop the car, it feels like the front brakes do more work and it stops better. Maybe because the rear brakes heat up a little and don't work as efficiently, thereby leaving the fronts to do more work? Or maybe by dragging the brake the proportioning valve is cutting down a bit of pressure to the rear?

I think I'm going to try the bleeding procedure the way 72bluNblu described then see how it feels. If it's still the same I'll replace the proportioning valve (the actual proportioning valve), maybe with an adjustable one, then see how that feels.

I'm in the middle of an engine swap right now so it might be a while before I get back to this, but once I'm back on the road I'll let you guys know how it works out.

Thanks so much for the help!!