No break pressure
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Joined: Apr 2019
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No break pressure
My 79 ford has no brake pressure in the rear. The rear drums are both fine. Replaced both solenoids no visible leaks. I'll bleed them and they hold for a few pumps then hit the floor. The reservoir is only losing brake fluid from the smaller side which is the fluid for the rear. I've put over a half quart of fluid through the lines and have no idea where the fluid is going. Cannot locate the leak. Was wondering if anyone had a similar issue or if someone might know what the hell is going on. Thanks
Mountain Pass
Joined: Apr 2018
Posts: 213
Likes: 3
I assume you mean wheel cylinders when you said solenoids. Start there make sure your lines are tight and bleeder screws are tight. Check front brake lines too. Looks for fluid on all the lines. Check your distribution block, located by your steering box mounted on the BIG cross member, for a leak. When you started the brake job did ALL of the fluid drain out? If you only added half a quart I would say you just introduced a HUGE amount of air in your system and you have a lot of bleeding to do.
Laughing Gas
Joined: Apr 2018
Posts: 1,244
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I'm guessing you still have a ton of air in the lines. When I installed new lines to the rear it took me forever, with a hand vacuum pump, to get it all out.
Also, did you make sure to adjust the rear brakes so they had a little drag?
Also, did you make sure to adjust the rear brakes so they had a little drag?
Fleet Mechanic
Joined: Apr 2012
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When you bleed the rear cyl's you must be getting a good flow of fluid or the master level wouldn't go down, you say they hold for a few pumps then the petal hits the floor. Kinda sounds like the master cyl is bad.
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Thanks for all the fast replies. This was my first post on here so it's good to know so many guys are ready to help out. I'll try bleeding them through all the way again with more then enough fluid and start from there.
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Thanks for all the fast replies. This was my first post on here so it's good to know so many guys are ready to help out. I'll try bleeding them through all the way again with more then enough fluid and start from there. Also, what's the best being order?
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Laughing Gas
Joined: Apr 2018
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Best order to bleed them? Closest to farthest, so drivers front, passenger front, driver rear, passenger rear.
I had to refill the reservoir for the rear several times during my rear bleed. To me, the best method is the hand pump with teflon tape on the bleeder threads and grease around where it attaches.
I had to refill the reservoir for the rear several times during my rear bleed. To me, the best method is the hand pump with teflon tape on the bleeder threads and grease around where it attaches.
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Mountain Pass
Joined: Sep 2018
Posts: 146
Likes: 11
From: Dillon, Montana
I just had this issue with my 77. First I replaced the solenoids, didn't fix it. Then I got a new slave cylinder, still couldn't get pressure to the rear. In the end it ended up being the master cylinder. The front brakes were getting pressure for days, but the master cylinder didn't allow fluid to go to the slave cylinder. Also, I would take an air hose and blow out your rear lines.
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I ended up getting two quarts today because it was dry and pumped as much as I could through until I saw a leak somewhere because it didn't make sense where all the fluid was going... had to drop my whole gas tank because for some unknown reason theres a splice in the brake line in the frame rail so I found it. Thanks again for the help.
Grumpy goat
Joined: May 2017
Posts: 3,058
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I'm all about old stuff, but one thing I've learned that isn't cool is the old antiquated brake proportioning valves on our trucks, and my jeeps. I've recently gotten rid of all of them. I plumbed front brakes direct to master cylinders, and used adjustable proportioning valves on rear brakes only. It's made a hell of a difference on all three vehicles.
Mountain Pass
Joined: Sep 2018
Posts: 146
Likes: 11
From: Dillon, Montana
I'm all about old stuff, but one thing I've learned that isn't cool is the old antiquated brake proportioning valves on our trucks, and my jeeps. I've recently gotten rid of all of them. I plumbed front brakes direct to master cylinders, and used an adjustable proportioning valves on rear brakes only. It's made a hell of a difference on all three vehicles.
Grumpy goat
Joined: May 2017
Posts: 3,058
Likes: 594
Yeah, but I'm not the genius. I saw it on another vehicle years ago. The only reason it took so long for me to do it is I was afraid of making brake lines. Turns out it's so easy, and actually fun to do.
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