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Another brake bleeding dilemma!!!
#2512194
06/23/18 02:53 PM
06/23/18 02:53 PM
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Joined: Jan 2003
Posts: 2,533 Alexandria, LA
Blucuda413
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,533
Alexandria, LA
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Background: Basically changed entire car over last 2 years. New aftermarket 9" rear, built new k-member and added Lamb struts, added rack and pinion steering. Reason for drastic change was to support added power from roots blown smallblock. Car is 68 Barracuda Notchback.
Still using stock brake pedal assembly & rod. Only old tubing is from firewall back to proportioning valve in rear. Braided stainless line from valve to T on rear. New tubing from T to each caliper (Wilwood rear brakes).
In front everything new from MC to Lamb calipers. From rear MC port I have braided stainless to Roll Control and from the Roll Control to T. From T new hard line to each frame anchor point. Braided stainless from each anchor point to caliper.
I'm on my second MC with same results with each. I have bled these brakes at least 15 times using all methods I have access to. Vacuum, pump & hold, drip method and pushing fluid from caliper back to MC. The end result is the same. The first push on the pedal it goes to the floor. On second or third pump I get some acceptable pedal. After a few moments the pedal will again go to the floor but provide pedal after 2 or 3 pumps.
I've bled master cylinders alone more than once and I can separate systems to MC, front system and rear system and each individual system will hold solid vacuum.
I'm at a loss and any recommendations are appreciated. I have another new MC to try but I don't really think it is a MC problem, altho my son believes it is.
Thanks, Max
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Re: Another brake bleeding dilemma!!!
[Re: Blucuda413]
#2512238
06/23/18 04:59 PM
06/23/18 04:59 PM
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Joined: Dec 2005
Posts: 11,408 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,408
Fulton County, PA
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What brakes were on it? What MC are you using? Sounds like MC bore is too small. 4 piston calipers with 1.75 bores on all 4 corners needs a big bore MC like the Strange 1.125".
Not a fan of those prop valves. Unnecessary if the system's correct, but that's another conversation. Just make sure it's wide open when bleeding.
If the results don't match the theory, change the theory.
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Re: Another brake bleeding dilemma!!!
[Re: Blucuda413]
#2512241
06/23/18 05:07 PM
06/23/18 05:07 PM
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Joined: Jan 2003
Posts: 21,050 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: 21,050
Niles , Ohio
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Are the bleeders for calipars pointing up?Thats the first thing to check.I had mine on upside down and had the same problem and Ive done brakes as a tech for decades.Its easy to do.Then if not that get some plugs and block off 1/2 of master and see what it does.I run 70 C body master one all disc we convert.Even if we run drums the same master just for drums.Rocky
Chrysler Firepower
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