Brakes won't pump up, Bad master cyl.? Options

[toon1]

I just completed the 5 lug conversion on the front and I can't get any brake pedal pressure. I've bled the system from the back pass. first, driver rear second, front pass. third and front driver last. I have clear fluid all the way through the system and no bubbles.

The front calipers are rebuilt with all new seals.

I pressed on the pedal slowly with the bleeder valve open and can see fluid moving towards the catch bottle.

There are no leaks anywhere.

I'm stumped, I'm wondering if the master went bad somehow and it wont build pressure.

They worked great before the conversion.

[McMark]

I'd go to the parts store and get a couple of short lengths of brake hard line. Cut 1/2" to 1" of tube and crimp the end flat. Then solder or epoxy the center tube shut. You want no air leaks and it has to stand up to pressure.

Then install these new plugs into the connections on the master cylinder (there's three). With everything sealed up, jump in the car and pump the pedal until it's absolutely rock hard. I can't emphasize that enough don't stop until the pedal doesn't move (aside from the gap between the pedal pushrod and the MC internals). You'll have to top off the fluid a few times. Also do different movements-- full strokes, short bursts, simply tapping the pedal with your foot. All these things will cause bubbles to burp out the reservoir.

Once it's completely bled out, hook up the calipers and bleed those. You either need to be quick when swapping the plugs for the lines, or have someone step on the brake pedal. Having the pedal pushed down will block off the reservoir feed lines and keep the MC and reservoir from draining. There will be a squirt of fluid when you open the first connection, but if the helpe doesn't move their foot, it won't drip any more fluid after that.

[mrbubblehead]

I'd go to the parts store and get a couple of short lengths of brake hard line. Cut 1/2" to 1" of tube and crimp the end flat. Then solder or epoxy the center tube shut. You want no air leaks and it has to stand up to pressure.

Then install these new plugs into the connections on the master cylinder (there's three). With everything sealed up, jump in the car and pump the pedal until it's absolutely rock hard. I can't emphasize that enough don't stop until the pedal doesn't move (aside from the gap between the pedal pushrod and the MC internals). You'll have to top off the fluid a few times. Also do different movements-- full strokes, short bursts, simply tapping the pedal with your foot. All these things will cause bubbles to burp out the reservoir.

Once it's completely bled out, hook up the calipers and bleed those. You either need to be quick when swapping the plugs for the lines, or have someone step on the brake pedal. Having the pedal pushed down will block off the reservoir feed lines and keep the MC and reservoir from draining. There will be a squirt of fluid when you open the first connection, but if the helpe doesn't move their foot, it won't drip any more fluid after that.

i'm not understanding (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/confused24.gif)