Ya.

"The most common problems that occur in the master cylinder is wear in the piston bore and piston seal failure. The classic symptom of a failing master cylinder is a brake pedal that slowly sinks while pressure is held against the pedal. The cure is to replace the master cylinder."

http://www.import-car.com/basic-brak...ster-cylinder/

Pretty sure that's what I said.

I've had that happen on a few cars with the Chevelle being one of them.

Pedal doesn't go to the floor, it goes down a few inches more than usual then feels normal. That's why I didn't relate your description. Thank you though. I'm assuming the discrepancy is that there are two pistons in the MC, and probably only one is leaking?

Im surprised that you have a vacuum booster on a diesel being they do not create vacuum. I know it has a vacuum pump but it seems like a silly setup.

Makes marketing sense, not engineering sense.

Its primarily a gas engine vehicle, with mass produced vacuum boosters. Not cost effective to screw with all that.

Oh, and in case you were wondering:


Attachment 990

So fucking strange. Brake demons.

I changed out the MC today. Got in the car after bench and pedal bleeding, brakes felt the same, spongy. Drove down the street, slammed on the brakes and locked the tires out of frustration, then the brakes felt good again. Brakes felt solid for 35 miles out of my 45 mile trip to Pasadena... and now they're spongy again. Mother fucker. Im ready to sell this bitch.

Also, vacuum escaped when I took the MC off. So I know the booster is holding vacuum.

A little off topic, but is the diesel swap legal?

Pretty sure since Jeep is the one that crammed that thing in there. :sm_laughing: