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+1 vote for running it the way it is. If you're going to bother doing anything you should upgrade to the later factory disc brake setup. I have a friend with a 440 Duster that has re-drilled axles on the back. He takes the car to the track regularly running drag radials and he hasn't broken...

Have a look at this: Restoring and tweaking 4-piston disc brakes The key bit of info: Factory literature of the period stated emphatically that these rotors were not to be machined thinner, but replaced if the grooving made the rotor unuseable. Research has uncovered the reason for that...

Ok, so thin rotors are probably not the issue.

Hey, here's a thought. What would happen if the thickness of the rotors was under spec? Could it be difficult for the pads to put sufficient clamping force on the rotors?

That looks like the combination safety switch and proportioning valve. Different from my setup with those things as separate pieces.

Thanks Mattix, I fell into a rabbit hole watching those old Master Tech videos! They're awesome. But it just left me thinking the same thing I've been thinking for years and that the issue has to be the master cylinder. Even though I have already replaced the master cylinder. So next on the...

I replaced the booster a few years back with this: 1970 DODGE DART Right Stuff Detailing Master Cylinder and Booster Assemblies G80011001 So it's a 1.063" bore. I also replaced the calipers and pads around the same time. Is 1.063 the right bore size? I was also thinking that maybe the front...

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...

Hey guys, I have the Kelsey Hayes brake setup on my 70 Swinger with power brakes. Under hard braking the rear wheels lock up and the front wheels don’t, so I’m thinking that perhaps my 50 year old proportioning valve isn’t working well. I have a couple of spares that are identical to the...

My car has Kelsey-Hayes discs up front and drums in the back. I just put this one on my car because the factory booster was toasted, and I'm quite happy with the results. It's not a perfect OE look, but it's close and that doesn't bother me in the slightest anyway...

Hey Pettyblu, did you get this issue resolved? I have the same booster as you and I'm having the same difficulty.

Right... this is exactly what happens to me. So I just need to get an adjustable proportioning valve and tweak it?

Would you be so kind as to share this wisdom with me, so that I may keep my front end forward during panic stops?