Re: A body disc brake conversion issue
[Re: maximus]
#2491893
05/04/18 11:51 AM
05/04/18 11:51 AM
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Joined: Jan 2003
Posts: 8,681 Buford, GA
I_bleed_MOPAR
master
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master
Joined: Jan 2003
Posts: 8,681
Buford, GA
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Having to pump the pedal sounds like air in the lines. Did you bench-bleed the master before installation? Are the bleeder screws at top of calipers?
Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: A body disc brake conversion issue
[Re: I_bleed_MOPAR]
#2491918
05/04/18 12:24 PM
05/04/18 12:24 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Did you bench-bleed the master before installation? X2
live every 24 hour block of time like it's your last day on earth
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Re: A body disc brake conversion issue
[Re: maximus]
#2491946
05/04/18 01:17 PM
05/04/18 01:17 PM
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Joined: Feb 2003
Posts: 18,582 Rust Belt, SW PA
Silver70
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 18,582
Rust Belt, SW PA
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What brake fluid did you use?
68 Road Runner, 69 Belvedere, 71 Challenger Vert 340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z 66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram
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Re: A body disc brake conversion issue
[Re: maximus]
#2491957
05/04/18 01:33 PM
05/04/18 01:33 PM
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Joined: Jan 2003
Posts: 21,085 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,085
Niles , Ohio
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Are the bleeders up?Thats sounds like the probem.Dont ask how I know.Its an easy mistake to mount the calipars with the bleeders pointing down.Rocky
Chrysler Firepower
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Re: A body disc brake conversion issue
[Re: maximus]
#2492097
05/04/18 05:14 PM
05/04/18 05:14 PM
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Joined: Dec 2007
Posts: 18,160 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,160
Mass
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No, one block only. Inline Tube told me only one used on 69 to 74 A bodies. I found an old manual and it looks like the seals (piston cups) are all in the right direction.I put the master cylinder back in the car, bleed the cylinder, then hook it back together. Bleed the system again, tighten the rear brake to the point of dragging. First time I hit the pedal after all this and it goes to the floor, hit it again and it tightens up about 2/3 down. Pump the brakes a few more times and it stays about the same. Let it set for one minute try again and it goes to the floor again. What the heck. The pedal issue sounds like air still trapped in the system, are you using an "Inline" brand PV, they are known to be junk, how was fluid flow out the rears when bleeding? I've had situations where there was trapped air in the front calipers, and no amount of pumping/bleeding was going to resolve the issue, so I would remove each caliper, starting at the passenger side, compress the piston fully with a C clamp, keeping the piston compressed with the clamp I would have an assistant gently pump the pedal/hold pressure then open the bleeder, rinse and repeat a few times, then remove the C clamp and install the caliper/pads and pump that caliper piston into position, then repeat for the drivers side, worth a shot If you have a faulty PV valve and/or its closed not allowing the rears to bleed properly that's another issue
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Re: A body disc brake conversion issue
[Re: maximus]
#2492199
05/04/18 10:15 PM
05/04/18 10:15 PM
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Joined: Dec 2014
Posts: 5,947 ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,947
ohio
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Sounds like a bad master to me. Plug the ports on the master, pedal should be rock hard.
Angry white pureblood male
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Re: A body disc brake conversion issue
[Re: ruderunner]
#2492208
05/04/18 10:41 PM
05/04/18 10:41 PM
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Joined: Dec 2007
Posts: 18,160 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,160
Mass
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Sounds like a bad master to me. Plug the ports on the master, pedal should be rock hard. It could be?, fluid blowing past the piston/seals, and it could be trapped air? often difficult issues, esp trying to troubleshoot via the net...
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Re: A body disc brake conversion issue
[Re: DAYCLONA]
#2492229
05/04/18 11:55 PM
05/04/18 11:55 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would assume that all of the seals should be faceing forward & if one ain't then that is a first for me but with assembly line rebuilds it is certainly possible either from an assembler spacing off or pi$$ed off about something. I would definitely get that resolved however which way you do it then with it bled out & capped, the pedal should be (1) rock hard with (2) virtually no travel with (3) light pedal force & by (4) stomping on it. with the MC resolved then you can uncap/hookup the fronts & as said sometimes calipers can be a bear to bleed. sometimes having a helper vigoriously pumping the pedal then you with perfect timing opening the bleeder on his 4th downstroke will be enough to agitate the fluid & scoot the bubbles out of there & sometimes a caliper needs to be removed & the piston travel blocked & it bled while you hold it in a better position but I think the MC seal is the problem (for sure holler what it ends up being).
live every 24 hour block of time like it's your last day on earth
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Re: A body disc brake conversion issue
[Re: maximus]
#2492396
05/05/18 12:44 PM
05/05/18 12:44 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'm sure glad we didn't talk you into pulling the guts out of the MC!
live every 24 hour block of time like it's your last day on earth
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