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Discussion Starter · #1 ·
There is no leak in the system, I have blead every line and no air is coming out, i've inspected all lines front to back, no leaks, but the system does not build pressure,

* Important Note * the Pedal does get pressure way down low, but does not sink! But pumping the pedal up does not build up pressure to a nice pedal height.

This is a 69 Mustang that originally had four wheel drum brakes. I've put a disk brake conversion on the front, the kit supplied a brake booster, master cylinder, front calipers, pads and rotors, I used the existing proportioning valve, and thus all other parts.

* Another Important Note * the car has sat now for 9 years, and the system was barely ever used.


Could the Master Cylinder be the problem? Thoughts!!
 

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look on the top of your brake pedal for adjustment, you can change the length of pedal travel by adjusting into another hole if it's like a chevy.
 

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Well, the master cylinder could need to be bench bled.

What's more likely, though, is that the rear brake shoes are not adjusted close enough to the drum. It takes a lot of brake pedal travel to make up distance to the drums. Once the shoes meet the drum, you will have a solid pedal.

Either that or the calipers aren't sliding on their guides. Same symptoms.
 

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Or are you pumping the system?

Did you bleed the master on the bench before installing it to the car?

What you should do is use a vaccum bleeder. this will solve all your problems.
 
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