Faulty flex line in CPP disc brake kit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sixty4bigwindow · 11-29-2016, 08:58 PM

Ok, so after a few months of my rig being out at my father in laws house, doing the full front drop spindle, disc brake conversion, the only thing holding me back from being roadworthy is the passenger side flex line leaking. We couldn't bleed the front brakes because there was no vacuum from air getting in. Put the compressor to the front steel line off the prop valve. And heard the air coming out of the banjo fitting on the line.. measuring it with the micrometer, it is about .010 difference, making it slanted and not a good bite, even in the copper washers, you can see it's not fully seated.. summit says they're back ordered and i cant get a replacement until end of December..

My question is, can i just run a fatter copper washer? Or sonce the fitting is most likely jacked, do i have to wait for the replacement?? I just want to drive my baby since its been almost 8 months

thanks for the help guys!

**PGSigns** · 11-30-2016, 07:57 AM

Sounds like a trip to the parts store is in order. If you us a factory style line for a 73 and up truck you have to tweek the bend at the banjo bolt just a bit. I have done this on both my trucks.
Jimmy

scoot_mcgrute · 11-30-2016, 10:37 AM

I ran into a similar issue with my brake hoses from CPP but the reason mine leaked was because the line was on the caliper backwards. It wasn't off by much but it was enough to cause all kinds of problems bleeding the brakes. Flipped it around with new copper washers and it was all better.

sixty4bigwindow · 11-30-2016, 12:46 PM

Jimmy, so thats the one with a longer angled brass fitting, correct??

Scoot, which side did you put on the caliper? It looks as though it should only fit one way..

scoot_mcgrute · 11-30-2016, 02:18 PM

I felt kinda dumb for doing it the other way but the flat side goes to the caliper. The little tab on my hoses didn't stick out very far beyond the copper washer so I didn't catch it until bleeding time when I had a small leak.

sixty4bigwindow · 11-30-2016, 02:37 PM

Hmm ok scoot, i think that might be my issue. Ill check that and retry! Thanks man

sixty4bigwindow · 12-01-2016, 08:43 PM

Quick question, did the kits you guys got come with 2 sets of washers? Mine has a thin and a thicker set. I started with the thin set, should i try the thicker one?

**The Rocknrod** · 12-01-2016, 11:40 PM

Check your hoses as well, there may be a "stepped" side under the banjo fitting.

sixty4bigwindow · 12-03-2016, 05:36 PM

Scoot that worked! Thanks man!!

but if you look at my new post, cant bleed the system with the prop valve.. any suggestions??

luvbowties · 12-03-2016, 06:08 PM

Quote:

Originally Posted by sixty4bigwindow

Scoot that worked! Thanks man!!

but if you look at my new post, cant bleed the system with the prop valve.. any suggestions??

Gravity bleed the system? HTH; and enjoy the challenging fun!
Sam

scoot_mcgrute · 12-05-2016, 10:52 AM

Quote:

Originally Posted by sixty4bigwindow

Scoot that worked! Thanks man!!

but if you look at my new post, cant bleed the system with the prop valve.. any suggestions??

Awesome, glad that fixed the leak!

I'm not sure on why the proportioning valve won't let you bleed the system. Are you using the brake pedal to bleed the system?

My buddy has a Harbor Freight bleeder that didn't work well for me so we ended up doing it the old fashioned way.

11-29-2016, 08:58 PM	#1
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	Faulty flex line in CPP disc brake kit Ok, so after a few months of my rig being out at my father in laws house, doing the full front drop spindle, disc brake conversion, the only thing holding me back from being roadworthy is the passenger side flex line leaking. We couldn't bleed the front brakes because there was no vacuum from air getting in. Put the compressor to the front steel line off the prop valve. And heard the air coming out of the banjo fitting on the line.. measuring it with the micrometer, it is about .010 difference, making it slanted and not a good bite, even in the copper washers, you can see it's not fully seated.. summit says they're back ordered and i cant get a replacement until end of December.. My question is, can i just run a fatter copper washer? Or sonce the fitting is most likely jacked, do i have to wait for the replacement?? I just want to drive my baby since its been almost 8 months thanks for the help guys!

11-30-2016, 07:57 AM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Faulty flex line in CPP disc brake kit Sounds like a trip to the parts store is in order. If you us a factory style line for a 73 and up truck you have to tweek the bend at the banjo bolt just a bit. I have done this on both my trucks. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

11-30-2016, 10:37 AM	#3
scoot_mcgrute Registered User Join Date: Apr 2004 Location: Tigard, Or Posts: 503	Re: Faulty flex line in CPP disc brake kit I ran into a similar issue with my brake hoses from CPP but the reason mine leaked was because the line was on the caliper backwards. It wasn't off by much but it was enough to cause all kinds of problems bleeding the brakes. Flipped it around with new copper washers and it was all better. __________________ 1966 Army Truck http://67-72chevytrucks.com/vboard/s...d.php?t=691778

11-30-2016, 12:46 PM	#4
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	Re: Faulty flex line in CPP disc brake kit Jimmy, so thats the one with a longer angled brass fitting, correct?? Scoot, which side did you put on the caliper? It looks as though it should only fit one way..

11-30-2016, 02:18 PM	#5
scoot_mcgrute Registered User Join Date: Apr 2004 Location: Tigard, Or Posts: 503	Re: Faulty flex line in CPP disc brake kit I felt kinda dumb for doing it the other way but the flat side goes to the caliper. The little tab on my hoses didn't stick out very far beyond the copper washer so I didn't catch it until bleeding time when I had a small leak. Attached Images __________________ 1966 Army Truck http://67-72chevytrucks.com/vboard/s...d.php?t=691778

11-30-2016, 02:37 PM	#6
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	Re: Faulty flex line in CPP disc brake kit Hmm ok scoot, i think that might be my issue. Ill check that and retry! Thanks man

12-01-2016, 08:43 PM	#7
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	Re: Faulty flex line in CPP disc brake kit Quick question, did the kits you guys got come with 2 sets of washers? Mine has a thin and a thicker set. I started with the thin set, should i try the thicker one?

12-01-2016, 11:40 PM	#8
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Faulty flex line in CPP disc brake kit Check your hoses as well, there may be a "stepped" side under the banjo fitting. Attached Images __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

12-03-2016, 05:36 PM	#9
sixty4bigwindow Registered User Join Date: Feb 2016 Location: BACK in Southern Oregon... Don't ask Posts: 151	Re: Faulty flex line in CPP disc brake kit Scoot that worked! Thanks man!! but if you look at my new post, cant bleed the system with the prop valve.. any suggestions??



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