Reply to "Brakes locking up"

My 2¢. I'm just rambling here, but all the standard problem issues seem to have been addressed, so perhaps it is time to really think outside the box on this one?

You said your proportioning valve was gutted. Any chance there is still an issue within it?

You say it is a summer, heat related issue. Bear in mind, it could be the ADDED heat of Summer that brings the problem to the forefront.

In that vein, a wobbly disc will create quite a bit of heat. Have you checked disc run out? I"m not sure how bad run out could give you your symptoms, but I don't recall the issue being previously addressed in this thread.

Have you checked inside cabin pedal height? Could linkage be binding, possibly with the added heat of the season?

If you can create the problem at will now in the summer heat, then go for a drive until you get the problem, but take a cooler filled with some bags of ice.

Once the issue pops up, grab an ice bag and plop it on your booster, or MC, or proportioning valve. See what happens. You may be able to locate the problem area more accurately.

I still think this is a length problem with your piston rod. But that has been addressed...

Larry