Re: Line Lock (again)
[Re: Sniper]
#2758666
04/01/20 11:28 PM
04/01/20 11:28 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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All the combination valve is for is to push a piston over to turn the brake lite on to warn the driver if one side looses fluid/pressure No, that is not all the combination valve does. The valve that lights up the warning light also closes off the leaky half of the system keeping a firmer pedal than otherwise. The combination valve also provides metering, proportioning and functions as a splitter. I'm pretty sure if none of that was needed then none of the factory engineers wouldn't have put it in there, notice how they all did it. I think I'll listen to the engineers. If you read the rest of my post you would see it says all later valves had the prop valve and metering valve in them but the early ones did not. And that pistons does not block fluid from the other side. It is two independent systems. Look at the inside of a dual M/C and you can see they are independent of each other. Yea you will lose half the pedal if one side springs a leak but if you look at the inside of the M/C you can see M/C piston will compress the spring in it on one side and still have the other side with a much lower pedal. I did open a brake line on my car and I still have half my brakes. In fact I had both of my rear bleeders open and pumped my pedal and still have just under a half pedal and front brakes that stopped the car but not as good as all four of course. Ron
Last edited by 383man; 04/02/20 12:12 AM.
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Re: Line Lock (again)
[Re: 383man]
#2758742
04/02/20 08:49 AM
04/02/20 08:49 AM
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Joined: Aug 2011
Posts: 2,865 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,865
Pattison Texas
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The safety valve does not block fluid its only there to turn the brake light on the dash on to warn the driver. If you think about it when you get a leak in one side it loses pressure and the other side of the M/C that still has pressure pushes the switch valve over. Now if you do not have the safety valve between the two brake systems and you get a leak in one side the other side that normally pushes the switch valve over still has pressure and it will still have pressure wether it pushes a valve over of its a solid line with no valve and not connected to the other side at all. In fact the early systems on some vehichles did not have a switch valve in them and they also had no metering valve because the first one were drum brakes which don't use a metering valve and the prop valve was in the rear line only when it had one on the early systems. Ron 1
Last edited by csk; 04/02/20 11:51 AM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Line Lock (again)
[Re: Stanton]
#2761526
04/08/20 02:49 PM
04/08/20 02:49 PM
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Joined: Mar 2019
Posts: 181 Ontario Canada
Bennoel 10
member
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member
Joined: Mar 2019
Posts: 181
Ontario Canada
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All I know is: with the lineloc mounted right at the master and in the line to the front brakes it will hold the fronts on rock solid (with no rears) for as long as the solenoid is energized. I don't recall but I don't think the "brake" light comes on - but there is a seperate lineloc light to show its on (just in case you forget you're holding the button I guess!) I agree 100% that's what I remember ….lineloc mounted on firewall with line out of master directly to solenoid then to the low pressure switch where lines go to frt and rear wheels also separate light to indicate system in use as long as you manually hold button on.
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Re: Line Lock (again)
[Re: Bennoel 10]
#2762283
04/10/20 12:31 PM
04/10/20 12:31 PM
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Joined: Jan 2003
Posts: 12,043 State of Confusion
hp383
Just a normal tag again
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Just a normal tag again
Joined: Jan 2003
Posts: 12,043
State of Confusion
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While the topic of line locks is being discussed, I submit this question. I have installed my line lock as mentioned directly in the front line, before the pressure differential switch and not only did it not work, it caused the BRAKE light to turn on. (Please forgive the terrible photo editing to add the line lock solenoid) I then decided to read the instructions, and installed it in the line AFTER the pressure differential switch. This worked better, didn't turn on the BRAKE light, HOWEVER after about 2 seconds the truck will begin to roll just at idle. I do not know if this is a faulty line lock solenoid, a bad plunger in the solenoid, or what. But it definitely will not hold pressure to the front brakes. My hope is that its just a bad solenoid and once I replace it I will be able to hold the front tires. The solenoid is staying powered, but fluid seems to be moving through the unit. SO the question, Can installing it as shown by HURST cause my front wheel roll problem? https://documents.holley.com/1745000_instructions.pdflink it to the HURST instructions.
Join the Penguin Liberation Front!! Stop the Hippo Occupation!
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Re: Line Lock (again)
[Re: hp383]
#2762498
04/10/20 09:28 PM
04/10/20 09:28 PM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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Did you buy new lines to use on the car for this or did you cut and flare the old line or use feral type fittings for sealing the old lines? If either of the latter two try tightening them up some more and retest Can you see fluid leaking out anywhere now after using the line loc? Let us know what you did to fix this and the results
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Line Lock (again)
[Re: Cab_Burge]
#2762795
04/11/20 06:07 PM
04/11/20 06:07 PM
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Joined: Jan 2003
Posts: 12,043 State of Confusion
hp383
Just a normal tag again
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Just a normal tag again
Joined: Jan 2003
Posts: 12,043
State of Confusion
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Did you buy new lines to use on the car for this or did you cut and flare the old line or use feral type fittings for sealing the old lines? If either of the latter two try tightening them up some more and retest Can you see fluid leaking out anywhere now after using the line loc? Let us know what you did to fix this and the results In my installation the lines were all new. There are no leaks, system was properly bleed, and the brakes work perfectly fine in normal driving, pedal holds firm, stops on a dime. Only issue is when using the line lock.
Join the Penguin Liberation Front!! Stop the Hippo Occupation!
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