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#26 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
I know you said it's all new and you are getting fluid at the caliper. But, since I cant see it in your pictures I'll throw this out. The rubber line between the frame and rear end is many times plugged not allowing enough fluid to the rear brakes.
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#27 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
Which is why its weird the calipers arent working |
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#28 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
I looked through the CPP kits and it doesn't look like the rubber line that I'm talking about is included in any of the kits.
I'm talking about the one that goes from the frame to the rear end. The CPP kits look like they include hard lines that connect to the TEE at the end of the hose I'm talking about and it looks like they include the rubber lines to go to the calipers. |
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#29 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: CPP Rear Disc Brakes not bleeding!!
If the rubber line at the frame is old there is a strong possibility that it swells up when your brake pedal is pressed and there isn’t enough fluid or pressure to operate the calipers.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#30 |
Registered User
Join Date: Mar 2021
Location: Hershey Pennsylvania
Posts: 332
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Re: CPP Rear Disc Brakes not bleeding!!
I had the exact same problem on my 66 when I replaced everything including a new dual reservoir master cylinder. The front brakes bled instantly but even with a friend pumping I couldn't get a drop to the rear brakes. Bench bled it a second time and still nothing. I only had one idea to let gravity help so I opened the rear bleeders and disconnected the hardline from the master cylinder. Luckily I had a length of clear tubing big enough to fit tightly over the flared end of the line I removed from the master cylinder. I then filled a bottle that resembled a ketchup bottle with brake fluid, stuck the hose to it and hung it from my open hood like an IV bottle. It took a minute or two till it started running out of the bleeders but I then closed the bleeders and hooked the line back to the master cylinder and voila I was able to bleed out the remaining air bubbles like normal. Sounds janky but it worked.
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#31 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
Ill replace it, but i am getting fluid to the rear brakes, so i think it is working properly |
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#32 |
Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,041
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Re: CPP Rear Disc Brakes not bleeding!!
Having a LS engine would make no difference.
I would try a Mity Vac vacuum bleeder or a Motive pressure bleeder. I think some of the parts stores have loaner tools. Check with them. Back in the day I made a pressure bleeder. I took a piece of 1/4" steel flat stock sized a bit bigger than MC cover. Drilled and tapped two 1/8" NPT holes in the steel plate. Then I screwed in two 1/8" nipples. Then using rubber hoses connected the two nipples to a "T" to a single piece of rubber hose with a air hose fitting. On the under side of the plate I glued a piece of inner tube to seal it to the MC. I used a couple of c-clamps to clamp it to the top of the MC. Ran about 30-40 PSI. Worked great. You just have to refill the master as you bleed. |
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#33 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
I have one of these that I always use when bleeding a new system.
https://www.harborfreight.com/brake-...der-92924.html I don't use the bottle, just the vacuum part. I revert back to pumping the pedal and the one-man bleeder bottle for the final bleed. |
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#34 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
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#35 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
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#36 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
Is this hose you are talking about? Will it work with disc brakes or is there another hose i need to purchase for disc brakes? |
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#37 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
Where in Dallas are you? I'll loan you my harbor freight one...
Here's an example of the hose. It doesn't matter if disc or drum, it's just passing fluid from the hard line on the frame to the hard lines on the rear differential. https://www.classicparts.com/1967-70...ctinfo/71-361/ Here's another... https://www.rockauto.com/en/moreinfo...t=1792&jsn=937 And another https://www.oreillyauto.com/detail/c...ckup-rwd?pos=1 |
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#38 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
I have a union that connects the hard lines on either side of the gear on the axle cover. https://www.summitracing.com/parts/d...RoCbWwQAvD_BwE This is what i have on my setup from the frame hardline to the axle hardlines |
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#39 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
Ok, I thought your truck was a 70? I think the one with the "TEE" built in is 71-72...
https://www.classicparts.com/1971-72...ctinfo/71-365/ Either way, if that line is original, you want to replace it. |
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#40 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
Here's the "TEE" that goes on the other line style...
https://www.classicparts.com/38-70-T...ctinfo/71-882/ |
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#41 |
Senior Member
![]() Join Date: Dec 1999
Location: TX
Posts: 1,569
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Re: CPP Rear Disc Brakes not bleeding!!
Crap, here's another question... Is your truck leaf or coils spring rear? because there are different hoses...
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#42 |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
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#43 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,467
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Re: CPP Rear Disc Brakes not bleeding!!
Are you getting pressure at the caliper line or just a little fluid ? You followed these instructions to set the ebrake? I had a problem with the 79 Caddy calipers on my Chevelle I had adjust the ebrake a few times
Mine came from the Right Stuff Detailing but the procedure is the same as yours since it's a gm caliper https://youtu.be/mlGt61_Sdb0
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. Last edited by 72c20customcamper; 09-29-2022 at 09:41 AM. |
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#44 |
Registered User
Join Date: Sep 2019
Location: Harleysville PA
Posts: 55
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Re: CPP Rear Disc Brakes not bleeding!!
I’m not sure if this is the problem but I had a similar problem with a classic Mustang front disc conversion some time ago. The brake calipers would not bleed. If you cracked the line at the calipers they would split fluid all over the place. The problem ended up being that the new caliper pistons had a very small radius on the bottom and Ford had a very large radius on their pistons. The hole that came into the bore was at the very bottom of the bore but came in from the side and not the bottom. When the piston was fully in to the bottom of the bore it would completely block off the hole. We sent the pistons out the a machine shop and had them add a larger radius to the piston and that solved the problem. I know it sounds stupid but sometimes stupid stuff happens. Just as a note , we had performed hundreds of conversions using the same kit and never had a problem. Dan.
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#45 |
Registered User
Join Date: Nov 2015
Location: Hewitt, Tx
Posts: 386
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Re: CPP Rear Disc Brakes not bleeding!!
Just a suggestion and I admit I didn't read the entire post but make sure you have them installed on the correct side. The bleeder needs to be at the top. I make a stupid mistake on my CPP front brakes and installed them on the wrong side and bleeder was down. I fought it for a few weeks not understanding why I had soft brakes then one day I looked at it and saw it. I was like crap seriously. I swapped them and brakes have been perfect ever since.
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#46 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
Thanks for the video, i have the ebrake adjusted and working great. I am not getting any pressure at the caliper when i press the brake pedal. |
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#47 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
I emailed CPP to see if i could exchange these for a new set and im waiting to hear back. The only thing i can think of is these calipers are defective. |
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#48 | |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 496
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
1. No pressure at the bleeder nipple on the caliper 2. Pressure/Fluid at the connector of the break line to caliper. (2 calipers per circuit) If so....you are not getting enough pressure to move the caliper piston past the bleeder port or the caliper is defective. Odd both calipers would be given you have a front and rear circuit. Is it possible that you still have air in the system? If so, opening the connection at the break line and caliper would result in you being able to push fluid out with the brake pedal and no real pressure would be required. But....if there is air in the system up stream, then the air pocket(s) might be enough to compress and eliminate or greatly reduce the pressure at the caliper piston when connected. Whereby not being sufficient pressure to move the caliper to a position the bleeder port is exposed. Maybe as a test...Remove break line at the caliper. Use DRY compressed air and pressurize the caliper at the break line port of the caliper. Open the bleeder nipple. If you get any air then the caliper is ok and you need to look to other parts of the system. Everyone has their preference. I have always used a vacuum bleeder with excellent results. On occasion a few pumps of the peddle was all I needed to get any pesky bubbles to clear and be vacuumed out. Best of luck. This can be a frustrating process but I am betting it is probably air in the system. |
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#49 |
Registered User
Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 530
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Re: CPP Rear Disc Brakes not bleeding!!
Anything on this? Just curious as to the outcome.
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#50 | |
Registered User
Join Date: Dec 2016
Location: Dallas, Tx
Posts: 60
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Re: CPP Rear Disc Brakes not bleeding!!
Quote:
However i still cant get fluid to the bleeder. |
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