Brake lines for disk/drum prop valve? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jimmydean · 12-30-2006, 05:43 PM

So I have the prop valve and the lines that run from the M/C to the valve. But the stock lines are 3/8 and mount to the bottom, where the new valve has one on the bottom (and it's 1/4") and one in the back. I have been to every parts store and nobody has a 3/8 to 1/4" reducer, or a male to male union so I can run a short line to the back.

Where can I get these parts? Did anyone else have these issues when swapping the front to discs? Man, what a pain!

70GMCer · 12-30-2006, 06:11 PM

Maybe 70c10 (Jim) can chime in here on this. He went through the same problem last week......

NitroMike · 12-30-2006, 08:11 PM

I ran into the same thing and got the required reducers/adapters at my local NAPA store. They always come through with the right quality pieces.
Good Luck.

jimmydean · 12-30-2006, 09:53 PM

NAPA was the first place I went. I will go to the bigger NAPA tomorrow and see. I figured if anyone had it, it would be them, guess just not in my little town.

krue · 12-30-2006, 10:14 PM

Could one of y'all post pics of your setup, 'cuz I swear I think I have mine backwards.

jimmydean · 12-30-2006, 10:59 PM

Front to front, rear to rear for 1/2 ton, reverse for 3/4 ton. There is a pic on here somewhere when I asked about hose routing.

krue · 12-30-2006, 11:02 PM

After doing a little reading, I think I'm gonna rob the booster/ m/c /prop valve off a 84 and put on mine, I hate the rusty, leaky m/c and ugly prop valve in the way on mine.

70c10 · 12-31-2006, 10:40 AM

Dave, I went to every parts store in town for the reducer fittings in the rear of the prop valve. I finally found it at Napa but I don't know the part number. I used two fittings (inverted flares) to make it work. The front line reducer fitting was easy to get. The brake conversion is on hold right now so I haven't been able to see if they will leak. I will post a pic of the fittings later today.

boraxman · 12-31-2006, 11:32 AM

I went through the same thing...so I ended up upgrading to stainless brake lines.

jimmydean · 12-31-2006, 04:50 PM

Quote:

Originally Posted by 70c10

Dave, I went to every parts store in town for the reducer fittings in the rear of the prop valve. I finally found it at Napa but I don't know the part number. I used two fittings (inverted flares) to make it work. The front line reducer fitting was easy to get. The brake conversion is on hold right now so I haven't been able to see if they will leak. I will post a pic of the fittings later today.

The back is where I'm having issues right now. I went a few towns over to a bigger napa and got the 1/4 to 3/16 reducer and a 1/4 x 8" brake line. So it looks like I'll need to do some funky 5/16 to 1/4 conversion with some pipe fitting in between.

jimmydean · 12-31-2006, 08:38 PM

So I got it all connected, but the prop valve is nowhere near mounting like it's supposed to. The prop line and bracket kit I got was about 3/4" too wide where it mounts to the M/C. Then when I got that together, the rear line was too close to the booster. Man, what a mess.

I'm guessing I will be replacing it all very soon anyway, but I will bleed it tomorrow and see if it's at least functional.

70c10 · 12-31-2006, 08:56 PM

Here is the pic showing the two fittings between the prop valve and existing brake line fitting. NAPA just started selling a new type of coated brake line that is bendable by hand

. It's very nice and you can bend it like a pretzel without kinking it!

pound41 · 12-31-2006, 10:30 PM

Got mine at home depot in the plumbing section

jimmydean · 12-31-2006, 10:34 PM

After looking at the pic on GMC Paul's site, I noticed they are way different than the ones I got.

My guess is the ones I got are for a different year. I can't find the paperwork, so I'm not sure what they said they were for, but they sure are these.

I was able to get the 3 fittings to connect the back, it's just wicked ghetto. I'll post a pic tomorrow. I am looking to replace everything soon anyway, but this should get me on the road.

My bracket looks like the one above but my lines look like these:

No wonder they didn't fit!

12-30-2006, 05:43 PM	#1
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Brake lines for disk/drum prop valve? So I have the prop valve and the lines that run from the M/C to the valve. But the stock lines are 3/8 and mount to the bottom, where the new valve has one on the bottom (and it's 1/4") and one in the back. I have been to every parts store and nobody has a 3/8 to 1/4" reducer, or a male to male union so I can run a short line to the back. Where can I get these parts? Did anyone else have these issues when swapping the front to discs? Man, what a pain!

12-30-2006, 06:11 PM	#2
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Brake lines for disk/drum prop valve? Maybe 70c10 (Jim) can chime in here on this. He went through the same problem last week...... __________________ 1997 GMC Sierra Ext 1965 Mustang

12-30-2006, 08:11 PM	#3
NitroMike Active Member Join Date: Dec 2005 Location: Bethlehem, PA Posts: 346	Re: Brake lines for disk/drum prop valve? I ran into the same thing and got the required reducers/adapters at my local NAPA store. They always come through with the right quality pieces. Good Luck. __________________ The older I get, the faster I was!!

12-30-2006, 09:53 PM	#4
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Re: Brake lines for disk/drum prop valve? NAPA was the first place I went. I will go to the bigger NAPA tomorrow and see. I figured if anyone had it, it would be them, guess just not in my little town.

12-30-2006, 10:14 PM	#5
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Brake lines for disk/drum prop valve? Could one of y'all post pics of your setup, 'cuz I swear I think I have mine backwards. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-30-2006, 10:59 PM	#6
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Re: Brake lines for disk/drum prop valve? Front to front, rear to rear for 1/2 ton, reverse for 3/4 ton. There is a pic on here somewhere when I asked about hose routing. Last edited by jimmydean; 12-30-2006 at 11:02 PM. Reason: image

12-30-2006, 11:02 PM	#7
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Brake lines for disk/drum prop valve? After doing a little reading, I think I'm gonna rob the booster/ m/c /prop valve off a 84 and put on mine, I hate the rusty, leaky m/c and ugly prop valve in the way on mine. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

12-31-2006, 10:40 AM	#8
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Brake lines for disk/drum prop valve? Dave, I went to every parts store in town for the reducer fittings in the rear of the prop valve. I finally found it at Napa but I don't know the part number. I used two fittings (inverted flares) to make it work. The front line reducer fitting was easy to get. The brake conversion is on hold right now so I haven't been able to see if they will leak. I will post a pic of the fittings later today. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 12-31-2006 at 10:40 AM.

12-31-2006, 11:32 AM	#9
boraxman Keepin an eye out Join Date: Feb 2003 Location: So.Cal Posts: 3,920	Re: Brake lines for disk/drum prop valve? I went through the same thing...so I ended up upgrading to stainless brake lines. __________________ 1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351

12-31-2006, 08:38 PM	#11
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Re: Brake lines for disk/drum prop valve? So I got it all connected, but the prop valve is nowhere near mounting like it's supposed to. The prop line and bracket kit I got was about 3/4" too wide where it mounts to the M/C. Then when I got that together, the rear line was too close to the booster. Man, what a mess. I'm guessing I will be replacing it all very soon anyway, but I will bleed it tomorrow and see if it's at least functional.

12-31-2006, 08:56 PM	#12
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: Brake lines for disk/drum prop valve? Here is the pic showing the two fittings between the prop valve and existing brake line fitting. NAPA just started selling a new type of coated brake line that is bendable by hand . It's very nice and you can bend it like a pretzel without kinking it! Attached Images __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 12-31-2006 at 08:57 PM.

12-31-2006, 10:30 PM	#13
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,268	Re: Brake lines for disk/drum prop valve? Got mine at home depot in the plumbing section

12-31-2006, 10:34 PM	#14
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Re: Brake lines for disk/drum prop valve? After looking at the pic on GMC Paul's site, I noticed they are way different than the ones I got. My guess is the ones I got are for a different year. I can't find the paperwork, so I'm not sure what they said they were for, but they sure are these. I was able to get the 3 fittings to connect the back, it's just wicked ghetto. I'll post a pic tomorrow. I am looking to replace everything soon anyway, but this should get me on the road. My bracket looks like the one above but my lines look like these: No wonder they didn't fit! Last edited by jimmydean; 12-31-2006 at 10:42 PM.



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