69 chevy truck brake question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

v62go · 10-14-2012, 08:57 PM

i had a problem with my rear brakes not working and it turned out being the rubber hose was clogged..now here is my question..my rear brakes are dragging in foward rotation but they spin pretty easliy in reverse rotation,what could be causing that? thanks billy

**Daddy Brim** · 10-14-2012, 09:03 PM

Are your brake shoes on correct ? The small shoe is the primary it goes to the front. This helped me a lot. http://www.pbase.com/nufsed/drumbrake

GMCJOE · 10-14-2012, 10:05 PM

You should flush your entire brake system since you had a clogged line. Check to make sure your E-brake isn't causing any drag. Make sure your adjusters are set right. And make sure all the components are still good. Wheel cylinders could be sticking. Is it one side or both?

v62go · 10-14-2012, 10:43 PM

Quote:

Originally Posted by GMCJOE

You should flush your entire brake system since you had a clogged line. Check to make sure your E-brake isn't causing any drag. Make sure your adjusters are set right. And make sure all the components are still good. Wheel cylinders could be sticking. Is it one side or both?

both sides

bartmcneill · 10-14-2012, 11:37 PM

I had the same problem, new hose, new rear brake cylinders, new master cylinder, flushed hoses but now have brakes. It feels good to stop.

68 TT · 10-15-2012, 05:38 AM

Quote:

Originally Posted by GMCJOE

You should flush your entire brake system since you had a clogged line. Check to make sure your E-brake isn't causing any drag. Make sure your adjusters are set right. And make sure all the components are still good. Wheel cylinders could be sticking. Is it one side or both?

I agree.

Same thing you describe happens when the emergency brake is on. Sounds like you still have fluid stuck in the rear hard lines or the emergency brake system is stuck. Rusty cables out back and up front can cause the emergency brakes to stick too so you need to check all the cables as well and not just the parts under the brake drums.

If the rubber hose was clogged then there are probably more areas with buildup in them and the whole system needs flushed out. I fought that on a car I bought and ended up replacing all the hard lines, flex hoses and hydraulic parts in the system to get rid of the contamination.

v62go · 10-15-2012, 11:54 AM

i took all the rear hard lines off when i replaced the rubber hose and blew them out...

ChevLoRay · 10-15-2012, 01:32 PM

If you have the original rubber lines, they can deteriorate and restrict the return flow of brake fluid....It's just as easy to replace them, as it is to take them off and blow them out.

v62go · 10-15-2012, 02:02 PM

I put a new rubber hose on it.
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**Classic Heartbeat** · 10-15-2012, 02:18 PM

Have you removed the drums to see if everything is functioning as it should? Slack adjusters free and etc? That is where I would start. WES

v62go · 10-15-2012, 04:08 PM

I tried pulling the drum off but its stuck on there pretty good...any tricks to getting it taken off?
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GMCJOE · 10-15-2012, 04:12 PM

I took a hammer and tapped around the center of it to get mine broke loose. They can be a PITA. You can always use a 3 jaw puller, makes life much easier if they don't pull right off.

GRX · 10-15-2012, 04:25 PM

Quote:

Originally Posted by v62go

I tried pulling the drum off but its stuck on there pretty good...any tricks to getting it taken off?
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First, be sure there are no spring clips over some of the studs. It's pretty common for the drum to stick where it slides over the center hub. Spray some penetrating oil on there, let it sit for a couple hours, then apply some heat to the drum around the center. Often times the drum will pop right off.

Are your brakes new or old? If they are old the drum may be worn and it may be necessary to adjust the shoes inward enough to clear the ridge on the outside edge of the wear surface. It which case your drums should be resurfaced, or possibly replaced if worn passed maximum diameter.

v62go · 10-15-2012, 05:56 PM

Quote:

Originally Posted by GRX

First, be sure there are no spring clips over some of the studs. It's pretty common for the drum to stick where it slides over the center hub. Spray some penetrating oil on there, let it sit for a couple hours, then apply some heat to the drum around the center. Often times the drum will pop right off.

Are your brakes new or old? If they are old the drum may be worn and it may be necessary to adjust the shoes inward enough to clear the ridge on the outside edge of the wear surface. It which case your drums should be resurfaced, or possibly replaced if worn passed maximum diameter.

I dont have a clue on the condition of the rear brakes...i bought the truck with no motor and got it running and then i ran into this...im going to try tomorrow to get the drums off and let yall know what i find...thanks to everybody with the advice given so far..hopefully it will turn out to be something simple.
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**Stocker** · 10-15-2012, 06:03 PM

That you have not removed the drums changes things a bit. Chances are the return springs have, well, lost their spring. You can get new spring kits at NAPA or other parts stores. Heck, you might find other things to replace once you get inside there...

**Classic Heartbeat** · 10-15-2012, 06:04 PM

Sounds like to me that you have brake or brake hardware issues. If there are not any clips on the studs holding the drums on, and you have sprayed the studs and around the end of the axle with penitrating oil and your drums still don's slip off, your shores or whats left of them has eaten wrtight into the drums. The only way to remove the drum is by backing the slack adjusters with a screw driver or brake tool. Then remove the drums and replace the brakes, wheel cylenders and I also would by a brake kit witch will have all new hardware. You can buy new slack adjusters if yours are bad also, or sometimes you can spray them with penitrating oil to loosen them up. and work them free. WES

v62go · 10-17-2012, 05:30 PM

I got it figuered out and please dont laugh to hard at me...i put a ls1 and a 700r4 in the truck and i moved the crossmember up a couple inches in the process and i left the emergency brake cable bracket that bolts to the back of the crossmember unhooked and for some unknown reason when i was under the truck trying to figure out my brake problem i decided to bolt it up...long story short i did something dumd and chased my tail for two days for no reason....lol
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**Stocker** · 10-17-2012, 05:45 PM

At least you found the problem!

68 TT · 10-18-2012, 01:13 AM

Glad you got it figured out and it was an easy fix.

Shyguy · 10-18-2012, 09:08 AM

Glad you found the problem, but an inspection of the rear brakes is still a good idea.

10-14-2012, 08:57 PM	#1
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	69 chevy truck brake question i had a problem with my rear brakes not working and it turned out being the rubber hose was clogged..now here is my question..my rear brakes are dragging in foward rotation but they spin pretty easliy in reverse rotation,what could be causing that? thanks billy

10-14-2012, 09:03 PM	#2
Daddy Brim Senior Member Join Date: Feb 2011 Location: Clovis Ca. Posts: 632	Re: 69 chevy truck brake question Are your brake shoes on correct ? The small shoe is the primary it goes to the front. This helped me a lot. http://www.pbase.com/nufsed/drumbrake __________________ I'm sorry I called you stupid. I thought you knew already. 67 C-20 Custom Camper 68 Nova 396 it does wheelies 2005 Buick Century the one the wife drives 1989 Toyota Tercel to drive when I can't put gas in the first 2.

10-14-2012, 10:05 PM	#3
GMCJOE Registered User Join Date: Aug 2012 Location: Junction City, KS Posts: 782	Re: 69 chevy truck brake question You should flush your entire brake system since you had a clogged line. Check to make sure your E-brake isn't causing any drag. Make sure your adjusters are set right. And make sure all the components are still good. Wheel cylinders could be sticking. Is it one side or both? __________________ Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust

10-14-2012, 11:37 PM	#5
bartmcneill Registered User Join Date: Sep 2012 Location: Ada Posts: 5	Re: 69 chevy truck brake question I had the same problem, new hose, new rear brake cylinders, new master cylinder, flushed hoses but now have brakes. It feels good to stop.

10-15-2012, 11:54 AM	#7
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	Re: 69 chevy truck brake question i took all the rear hard lines off when i replaced the rubber hose and blew them out...

10-15-2012, 01:32 PM	#8
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: 69 chevy truck brake question If you have the original rubber lines, they can deteriorate and restrict the return flow of brake fluid....It's just as easy to replace them, as it is to take them off and blow them out. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

10-15-2012, 02:02 PM	#9
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	Re: 69 chevy truck brake question I put a new rubber hose on it. Posted via Mobile Device

10-15-2012, 02:18 PM	#10
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: 69 chevy truck brake question Have you removed the drums to see if everything is functioning as it should? Slack adjusters free and etc? That is where I would start. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-15-2012, 04:08 PM	#11
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	Re: 69 chevy truck brake question I tried pulling the drum off but its stuck on there pretty good...any tricks to getting it taken off? Posted via Mobile Device

10-15-2012, 04:12 PM	#12
GMCJOE Registered User Join Date: Aug 2012 Location: Junction City, KS Posts: 782	Re: 69 chevy truck brake question I took a hammer and tapped around the center of it to get mine broke loose. They can be a PITA. You can always use a 3 jaw puller, makes life much easier if they don't pull right off. __________________ Joseph Joe's 69 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543253 1969 GMC SWB-350 SBC 700R4 2013 Ram 2500 CC Laramie Longhorn Edition-6.7 PPEI EFI Live CSP5 5” ProFlo Exhaust

10-15-2012, 06:03 PM	#15
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,749	Re: 69 chevy truck brake question That you have not removed the drums changes things a bit. Chances are the return springs have, well, lost their spring. You can get new spring kits at NAPA or other parts stores. Heck, you might find other things to replace once you get inside there... __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

10-15-2012, 06:04 PM	#16
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: 69 chevy truck brake question Sounds like to me that you have brake or brake hardware issues. If there are not any clips on the studs holding the drums on, and you have sprayed the studs and around the end of the axle with penitrating oil and your drums still don's slip off, your shores or whats left of them has eaten wrtight into the drums. The only way to remove the drum is by backing the slack adjusters with a screw driver or brake tool. Then remove the drums and replace the brakes, wheel cylenders and I also would by a brake kit witch will have all new hardware. You can buy new slack adjusters if yours are bad also, or sometimes you can spray them with penitrating oil to loosen them up. and work them free. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-17-2012, 05:30 PM	#17
v62go Registered User Join Date: Feb 2012 Location: davidson north carolina Posts: 105	Re: 69 chevy truck brake question I got it figuered out and please dont laugh to hard at me...i put a ls1 and a 700r4 in the truck and i moved the crossmember up a couple inches in the process and i left the emergency brake cable bracket that bolts to the back of the crossmember unhooked and for some unknown reason when i was under the truck trying to figure out my brake problem i decided to bolt it up...long story short i did something dumd and chased my tail for two days for no reason....lol Posted via Mobile Device

10-17-2012, 05:45 PM	#18
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,749	Re: 69 chevy truck brake question At least you found the problem! __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

10-18-2012, 01:13 AM	#19
68 TT Still plays with trucks Join Date: Jul 2009 Location: Spokane, WA Posts: 3,556	Re: 69 chevy truck brake question Glad you got it figured out and it was an easy fix. __________________ miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars



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10-18-2012, 09:08 AM	#20
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: 69 chevy truck brake question Glad you found the problem, but an inspection of the rear brakes is still a good idea. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

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