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#1 |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Brake fluid being rejected from master cylinder?
I'm thinking the master cylinder I was given to buy was the wrong one for the wrong year and I didn't know that yet installed it and it's cause the back pressure or there's something I'm missing?
I've bought a new one which you can see in the photos that looks different where this one is for the correct year 69. I've bled and bled and BLED the brake lines, checked for air leaks in the line yet I haven't solved the problem? I've asked a few auto placees (auto zone, auto parts..) and they've all given me different anwsers. So here I am my Chevy family, lol I'm here to ask what's up? I was told by one guy I need a "brake valve" or "balancer/valve" to level out the correct brake presure... soooo ??? What's up guys....? What am I missing? |
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#2 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Brake fluid being rejected from master cylinder?
Did you "bench bleed" the new MC? Then bleed all four corners starting with the front left, right front, right rear, and then the left rear...Nearest to farthest clockwise.
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#3 |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Wow, thanks so much for that info!
I have never been taught to bleed completely from the very beginning. Well now that I have a new master cylinder I know what the first step is! : ) Thanks so much!!! Lets hope that's the only problem because I know that step I didn't do in the beginning. Later! |
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#4 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Brake fluid being rejected from master cylinder?
Good lookin motor and clean motor bay...let us know how the brake issue went...
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#5 |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Hey thanks!
Yea, I haven't fixed the problem yet, but here soon I'm gonna put sometime into it! Sadly right now I'm working 6 days/night shifts for 12 hours. lol So my body is gone by day light! lol But soon will see what happens! |
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#6 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,437
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Re: Brake fluid being rejected from master cylinder?
I'm thinking the master cylinder I was given to buy was the wrong one for the wrong year and I didn't know that yet installed it and it's cause the back pressure or there's something I'm missing?
I've bought a new one which you can see in the photos that looks different where this one is for the correct year 69. I've bled and bled and BLED the brake lines, checked for air leaks in the line yet I haven't solved the problem? WHAT??? "given to buy"?? The one on the truck or the new one? "was the wrong one"?? The one on the truck or the MC in your hand? The one on the truck is leaking from under the cap, probably because the rubber reservoir diaphragm is torn. It also appears to be leaking out the back next to the booster. That MC is a wreck so it doesn't matter that you can't bleed the brakes with it. If all that fluid came from bleeding attempts, then you should be setting the cap on the reservoir, when you are not filling it. They will spit a little. The new MC in your hand looks like it has a larger front reservoir (?), so if it does, it was intended for a disc brake application. That really won't matter as long as the piston bore diameter is the same in the old and the new.
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'67 GMC 2500, 292, 4spd, AC |
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#7 |
Registered User
Join Date: Jul 2012
Location: Rosenberg, Texas
Posts: 3,506
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Re: Brake fluid being rejected from master cylinder?
I've always been taught when you bleed brakes to go farthest to nearest as related to distance from the master cylinder (Passenger Rear, Driver Rear, Passenger Front, Driver Front). It has something to do with getting the most amount of air out of the lines on the farthest run. Since air compresses more than fluid, it's possible that by starting nearest to farthest, you can suck air into the master from a corner that's farther away. This is obviously more likely to happen if you have just installed new brakes and lines.
However, if you have a dual bowl master (separate front and rear chambers), it shouldn't matter if you do front or rear first, but I always start farthest away from the master, and finish with nearest. That's not to say that it can't be done another way...
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-Duane C/10 Club Texas member 1971 Chevy C10 "Brutus" SWB Fleetside 2016 6.0L (L96) 6L90E (driver/project) 1965 Pontiac GTO "Royal Goat" 400/TH400 w/AC (my baby) |
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#8 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,225
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Re: Brake fluid being rejected from master cylinder?
Also worth mentioning is the fluid level in the master cylinder does not need to be full to the top. Over fill can be pushed out.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#9 |
Registered User
Join Date: Dec 2014
Location: Gray, Ga.
Posts: 183
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Re: Brake fluid being rejected from master cylinder?
Just posting this in case you dont know, and it hasnt been mentioned.
Its best to plug the outlets in the MC when bench bleeding it, and loosen the one your bleeding in the order ironangel specified. Also, its best to put the sytem under VACUUM when bleeding the lines, instead of pressure. That will PULL the air out of the system. Start from the farthest wheel cylinder, and work your way in. One more thing, the factory proportion valve is more than likely clogged up. 86 that thing and get a new one. Wilwood sells them and they come with the light switch.
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I just gotta get out here and do it, why? Cause nobody will do it for me... |
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#10 | |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Quote:
Awesome! Thanks man!! I've got a new one. So will see what happens when i install it and bleed it correctly!!! Thanks again! |
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#11 | |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Quote:
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#12 | |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Quote:
So the next step for me is to get some bleeder lines and do that step first and then install it. So I'll do some checks before i start the installment on the old one (tore diaphragm) and make sure to take the right steps! Thanks!! |
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#13 | |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Quote:
Hey! Thanks for the word there! I'll try and do that- Fartherest to Nearest. Good thought really! General terms that seems more sensible. Anyways, wish me luck!!! Thanks again!! |
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#14 |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
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#15 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Brake fluid being rejected from master cylinder?
"Nearest Master Cylinder First"...Thats a quote from the Factory Service Manual...Even if the wrong way works, dont make it right..."'just sayin"
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#16 |
Senior Member
![]() Join Date: Oct 2010
Location: Cadiz, Ky
Posts: 512
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Re: Brake fluid being rejected from master cylinder?
Wow, I've bled brakes wrong my whole life. I have always started at the farthest point. Just the way I was taught. Thanks Ironangel, next time I might get it right.
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1972 Chevy LWB Roadster 1999 Chevy Silverado 2wd 2015 Chevy High Country 4x4 Crew Cab |
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#17 | |
Registered User
Join Date: May 2013
Location: Russellville AR
Posts: 148
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Re: Brake fluid being rejected from master cylinder?
Quote:
Nice man!! Total belief in your statement the first time for sure! But I really appricate the time you took to look that up! Others probably will begin to change their style up to do it the correct way now once they read this "blog" comments on here! Later! |
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#18 |
Registered User
Join Date: Dec 2014
Location: Gray, Ga.
Posts: 183
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Re: Brake fluid being rejected from master cylinder?
Dam, ive been doin it wrong this whole time.
No wonder I cant never get all the air out. Ironangel, thanks. I gotta get a manual. Is that a Haynes, or a service manual?
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I just gotta get out here and do it, why? Cause nobody will do it for me... |
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