Master to Prop valve lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68K20 · 06-18-2007, 08:20 PM

Anyone know what size the lines are supposed to be that go between the master cylinder and proportioning valve? Truck in question is a 1968 with 1972 brakes. Here is what I have now, the drum side seems to be bigger than the disk side.

Here is a pic of what I have now.

Americanrider · 06-19-2007, 09:08 AM

Thats the way they are, drums need high volume/low pressure (large size lines) and the disk side needs low volume/high pressure (small lines)

68K20 · 06-19-2007, 02:14 PM

Thanks, that was what I thinking, I am getting ready to rebuild all the brakes in the truck (Master Cyl, WHeel Cyl, Calipers, soft line and etc) and just wanted to see if I should look at replacing the hard lines as well.

Orange · 06-19-2007, 02:23 PM

Just a question - I knew this before doing my setup - but went ahead with the all 3/16" line to the prop valve anyhow.

Is this going to matter?

My line to the prop valve is longer than most...(from there on it is 1/4" just like normal). My prop valve is on the frame, so I have a little more line there. I don't know if it is going to hurt anything, but just wondering if anyone might know for sure.

DLB

06-18-2007, 08:20 PM	#1
68K20 Noobie McNoobster Join Date: Nov 2006 Location: SoAZ Posts: 68	Master to Prop valve lines Anyone know what size the lines are supposed to be that go between the master cylinder and proportioning valve? Truck in question is a 1968 with 1972 brakes. Here is what I have now, the drum side seems to be bigger than the disk side. Here is a pic of what I have now. __________________ The Stable: 1968 Chevy K20 w/tilt, working AM/FM, AC and 350/350/205 w/Disk Brakes 1990 Chevy V2500 Suburban 2005 Kawi KLR650 1983 Honda Goldwing GL1100 Standard (Naked) 1995 Miata M Fortes Fortuna adiuvat

06-19-2007, 09:08 AM	#2
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Re: Master to Prop valve lines Thats the way they are, drums need high volume/low pressure (large size lines) and the disk side needs low volume/high pressure (small lines)

06-19-2007, 02:14 PM	#3
68K20 Noobie McNoobster Join Date: Nov 2006 Location: SoAZ Posts: 68	Re: Master to Prop valve lines Thanks, that was what I thinking, I am getting ready to rebuild all the brakes in the truck (Master Cyl, WHeel Cyl, Calipers, soft line and etc) and just wanted to see if I should look at replacing the hard lines as well. __________________ The Stable: 1968 Chevy K20 w/tilt, working AM/FM, AC and 350/350/205 w/Disk Brakes 1990 Chevy V2500 Suburban 2005 Kawi KLR650 1983 Honda Goldwing GL1100 Standard (Naked) 1995 Miata M Fortes Fortuna adiuvat

06-19-2007, 02:23 PM	#4
Orange Licensed to Thrill! Join Date: Apr 2006 Location: Northwest, GA Posts: 1,673	Re: Master to Prop valve lines Just a question - I knew this before doing my setup - but went ahead with the all 3/16" line to the prop valve anyhow. Is this going to matter? My line to the prop valve is longer than most...(from there on it is 1/4" just like normal). My prop valve is on the frame, so I have a little more line there. I don't know if it is going to hurt anything, but just wondering if anyone might know for sure. DLB __________________ 1971 GMC.Lowered. Overdrive. Orange. Krue's excellent FAQ Index.

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