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I have a 67 GT with front disks. The pads, rear shoes, master cylinder, booster and all lines are new. I seem to have good vacuum to the booster. The system is bled and I have excellent peddle pressure. My issue is stopping, they work, but not very well. The proportioning valve is original, could this be the problem?
 

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when you say they work, just not well, what exactly is the issue? Hard pedal? Are the pads okay, or are they glazed/contaminated?
 

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Well, you mentioned eveything is new...EXCEPT the calipers and the rear wheel cylinders.
The Kelsey Hayes calipers are a little prone to having stuck pistons. Check into that.
 

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ALso,
There are high pressure lines going into your calipers and they deteriorate over time. They are like your arteries and get smaller and smaller over time. I have replaced these to correct bad braking. :: Again, LOL.
TCT
 

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Just because the booster is new does not mean that it works. I went through three of them before I got one that worked.

Symptoms: nice firm pedal, no stopping power.
 
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