Having trouble bleeding brakes on 68 Rebel. New lines new calipers on front. Rear drums bleed perfectly. Pedal goes to floor when bleeding as it should. Pedal won't go to floor when loosening the bleeder on the fronts. Gravity feeds just fine so lines aren't plugged but when you pump up the pedal and loosen the bleeder, it just dribbles out and the pedal doesn't move. Any ideas? Bad front reservoir on master cylinder maybe? Thanks in advance.
Does that use the GM style proportioning valve? If so you have to remove the switch and insert a plastic tool to hold the unit open while you bleed and then replace. I have never worked on AMC cars so I don't know what you have.
Seems there are a number of posts about this on the AMC forum. EXAMPLE: https://theamcforum.com/forum/brake-bleeding_topic26934.html I would check each component moving downstream, even though this is going to be a mess. Remove the line at the master. hold a finger or thumb over the outlet port. Have someone press the pedal. Does it work as expected (sink down, push fluid out)? Note that a dual master will not bottom out if the other half is fully bled. That's the safety factor of a dual master. It will still provide some braking with half the system leaking. Next, reconnect the line at the master, disconnect the flex hose then bleed the line. Same fluid out, and pedal drop? Connect the flex hose, then remove the caliper end,then bleed the hose. Same fluid out, and pedal drop? Remove the bleeder at the caliper and inspect. Connect the flex hose, and bleed the caliper again with thumb or finger covering the bleeder port. The bleeder is at the top of the caliper bore, right? It's a simple system, just break it down and go step by step. If everything is beautifully detailed and painted, a box of disposable diapers might save you some grief. Be ready with a large supply of water either way. Brake fluid is nasty.
Like mentioned above, If both front not letting peddle go to floor when bleeder cracked , just drips . Check both hoses , bad crimps & debris has been found , if new calibers make sure they're not miss machined .
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