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Rear disc conversion= low pedal, any suggestions.
#1143016
12/24/11 02:54 AM
12/24/11 02:54 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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vashon island washington
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Hello all! My dad and I have '69 dart. It has manual brakes. 73 Dart discs up front and always had a great pedal. We got a summit rear disc brake conversion, single piston calipers w/ built in parking brake. Since the swap the pedal needed two pumps to get a good firm pedal. fluid shoots out, no air. Blead it, used a pressure bleeder ect. It got better when I tensioned the e/brake cable a bit. It is not dragging or anything. The master cylinder is a drum rear, disc front m/c from a 73 dart. After all my goofing around the pedal finally gets firm on one pump, but i'm still not satisifed with it. I was thinking of a 2 lb res. valve for the rear. Also I do have the bleeder mounted upright. Thank you so much! Happy holidays.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: Kern Dog]
#1143018
12/24/11 03:07 AM
12/24/11 03:07 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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vashon island washington
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I've heard of people going to cordoba m/c's? Was hoping to get away with my factory disc/drum. But if I have to brakes are rather important to have. thank you for your input.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: Kern Dog]
#1143022
12/24/11 03:32 AM
12/24/11 03:32 AM
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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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1st get a pair of brass male inverted flare end plugs from the Edelman section at your parts house and cap both M/C bores and if the M/C is good & bled out the pedal will be high and tight w virtually no travel. Then hookup the fronts & see if they pump up (air) & if so bleed em out till they're good then hookup the rears & repeat. Now see if they're all good. Holler w any news. If need be, bleed out the fronts & get em tight then cap em & bleed out the rears & get them tight then hook the fronts back up & see if everything is now all good. This'll help you determine if it is air (common) or lack of M/C capacity (less likely)
live every 24 hour block of time like it's your last day on earth
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: DoctorDiff]
#1143023
12/24/11 03:32 AM
12/24/11 03:32 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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vashon island washington
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rear bleeders are facing upward. Any recconmendations on what m/c to use at what parts I need to make it work? I/e m/c pushrod ect... It is a manual brake set up I have now. Thanks all! If I don't replay for a while my computer is not to relaible and i'm down for a day sometimes. Thanks!
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: DoctorDiff]
#1143024
12/24/11 03:33 AM
12/24/11 03:33 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Are the rear bleeder valves facing upward?
Doc he does say they are up
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: hunterstroble]
#1143025
12/24/11 03:34 AM
12/24/11 03:34 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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vashon island washington
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Robert, I did do that. Everything checks out. No air whatsoever. Thanks! The suggestions and help is much appreciated all.
The summit tech guy said they were mustang calipers if that helps at all.
Last edited by hunterstroble; 12/24/11 03:36 AM.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: hunterstroble]
#1143026
12/24/11 03:41 AM
12/24/11 03:41 AM
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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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Holler what it ends up being as I want to do a 4 wheel disc deal too (homemade so I need some ballpark bore dia #'s to work w) or avoid
live every 24 hour block of time like it's your last day on earth
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: hunterstroble]
#1143028
12/24/11 03:47 AM
12/24/11 03:47 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Sure thing, I'm sure i'm not the first person to come across this.
I will assume this kit came with rotors that matched
the calipers...the reason I ask is... if you have a
1/4 thick rotor and the caliper requires a 3/8 thick
rotor then you would have to hit the pedal a couple
of times to move the piston enough to contact the rotor
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: MR_P_BODY]
#1143029
12/24/11 03:50 AM
12/24/11 03:50 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
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Posts: 233
vashon island washington
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Yes it came as a complete kit. It is the summit set up. I told my dad to contact dr diff before buying anything but....stubborn old man.
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: hunterstroble]
#1143030
12/24/11 04:05 AM
12/24/11 04:05 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Yes it came as a complete kit. It is the summit set up. I told my dad to contact dr diff before buying anything but....stubborn old man.
Then I believe you just need a bigger bore master
(more volume)
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: MR_P_BODY]
#1143031
12/24/11 04:17 AM
12/24/11 04:17 AM
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Joined: Oct 2007
Posts: 3,894
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,894
Oregon
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I agree with going to a bigger bore. I had to go to an 1 1/4" MC with my 4 wheel disk conversion. It's still not great, but I'm thinking now that may be the booster.
I calculated the surface area of the old drum pistons compared to the old MC bore, then figured the percentage larger I had to go given the new disk piston surface area.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Rear disc conversion= low pedal, any suggestions.
[Re: hunterstroble]
#1143032
12/24/11 07:20 AM
12/24/11 07:20 AM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Quote:
Hello all! My dad and I have '69 dart. It has manual brakes. 73 Dart discs up front and always had a great pedal. We got a summit rear disc brake conversion, single piston calipers w/ built in parking brake. Since the swap the pedal needed two pumps to get a good firm pedal. fluid shoots out, no air. Blead it, used a pressure bleeder ect. It got better when I tensioned the e/brake cable a bit. It is not dragging or anything. The master cylinder is a drum rear, disc front m/c from a 73 dart. After all my goofing around the pedal finally gets firm on one pump, but i'm still not satisifed with it. I was thinking of a 2 lb res. valve for the rear. Also I do have the bleeder mounted upright. Thank you so much! Happy holidays.
I've done my share of 4 wheel disc brake set-ups over the years for myself and customers cars....so I know what your going thru, the Summit kit is basically a cheap chinese version of the SSBC set-up...
If the master your using is the correct 73 A body vintage, the casting number will be 3461187 this master has 1 1/32" bore, but has a limited stroke on the piston/bore, your not getting the volume you need to the rear, I'd recommend you use a 1970 B body MANUAL master, casting number 2225621, this master has 1 1/8" bore and amble travel in the piston/bore, I'd also recommend you get rid of the factory proportioning valve if your still using it, 4 wheel disc don't require a PV or distribution block, the front lines can be teed off left and right respectively, the rear line can be plumbed directly off the master
The Fenco line of rebuilt masters (AutoZone,CarQuest,NAPA, etc) are better quality than the Cardone line IMHO...Fenco PN# M1404 should be your ideal choice, the lines exit the master from the fender side, if you require the lines to exit the master from the engine side, Fenco PN# M1475 these are both 70 B Body only applications with 1 1/8" bore and disc/drum masters, bolt on, you MAY need adapters, or change and reflare the fittings/lines that attach to the master's ports...maybe
Mike
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