1966 C20 Rear Brake Dragging - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dmulally · 09-11-2019, 10:03 PM

Hi All,

I've been searching all day and haven't quite been able to locate the same problem.

66 C20 with an Eaton diff.

Changed a leaking wheel cylinder with a new one on the passenger side rear.

Adjusted the brakes with the drum off and it was a snug fit back on but didn't feel too tight.

Problem is that after a test drive it is dragging. If I jack up the rear I can spin the wheel backwards very easily but not forwards without a lot of trouble. If I jam the brakes on I can't spin the wheel at all. Of note is that the handbrake works really well on the drivers side but barely on the passenger. I have a new handbrake cable.

I don't remember anything coming out when I changed the wheel cylinder other than moving the shoes to the one side. I am wondering if it is the self adjuster or perhaps is it possible to put the hub bearing retaining nuts on too tight?

Any ideas of what I can do to test would be great.

Cheers in advance.

vince1 · 09-11-2019, 10:36 PM

The passenger side emergency brake cable is probably sticking.

Wrenchbender Ret · 09-11-2019, 10:44 PM

I agree with Vince. Or the emer. brake cable may be adjusted too tight.
George

**Captainfab** · 09-11-2019, 11:24 PM

About the best advise I can offer is to pull both drums and carefully compare the assembly of the offending side with the side that releases properly. My guess is that something did not go back together correctly.

dmulally · 09-12-2019, 01:23 AM

Thanks gents.

I replaced the front handbrake cable and adjusted it pretty tight. It only goes up about three clicks.

I'll back it off tonight and report back if successful to help any other searchers. Thanks.

dmulally · 09-12-2019, 01:42 AM

Hi All,

Snuck out and gave it a try. Findings are:

Brake pedal down and the wheel wont travel anywhere.
Handbrake on and the wheel still turns but resistance
Handbrake cable slackened off and cable loose to both sides and when on, turns backwards fine and still the same dragging/resistance going forward.

So looks like I'll be taking it off. There is a slight weep from the 8 axle face bolts so it needs attention anyway.

So close to finishing a project which is rare for me! This is the last hurdle.

09-11-2019, 10:03 PM	#1
dmulally Registered User Join Date: Feb 2018 Location: Shannon, New Zealand Posts: 31	1966 C20 Rear Brake Dragging Hi All, I've been searching all day and haven't quite been able to locate the same problem. 66 C20 with an Eaton diff. Changed a leaking wheel cylinder with a new one on the passenger side rear. Adjusted the brakes with the drum off and it was a snug fit back on but didn't feel too tight. Problem is that after a test drive it is dragging. If I jack up the rear I can spin the wheel backwards very easily but not forwards without a lot of trouble. If I jam the brakes on I can't spin the wheel at all. Of note is that the handbrake works really well on the drivers side but barely on the passenger. I have a new handbrake cable. I don't remember anything coming out when I changed the wheel cylinder other than moving the shoes to the one side. I am wondering if it is the self adjuster or perhaps is it possible to put the hub bearing retaining nuts on too tight? Any ideas of what I can do to test would be great. Cheers in advance.

09-11-2019, 10:36 PM	#2
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,170	Re: 1966 C20 Rear Brake Dragging The passenger side emergency brake cable is probably sticking.

09-11-2019, 10:44 PM	#3
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: 1966 C20 Rear Brake Dragging I agree with Vince. Or the emer. brake cable may be adjusted too tight. George

09-11-2019, 11:24 PM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: 1966 C20 Rear Brake Dragging About the best advise I can offer is to pull both drums and carefully compare the assembly of the offending side with the side that releases properly. My guess is that something did not go back together correctly. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

09-12-2019, 01:23 AM	#5
dmulally Registered User Join Date: Feb 2018 Location: Shannon, New Zealand Posts: 31	Re: 1966 C20 Rear Brake Dragging Thanks gents. I replaced the front handbrake cable and adjusted it pretty tight. It only goes up about three clicks. I'll back it off tonight and report back if successful to help any other searchers. Thanks.

09-12-2019, 01:42 AM	#6
dmulally Registered User Join Date: Feb 2018 Location: Shannon, New Zealand Posts: 31	Re: 1966 C20 Rear Brake Dragging Hi All, Snuck out and gave it a try. Findings are: Brake pedal down and the wheel wont travel anywhere. Handbrake on and the wheel still turns but resistance Handbrake cable slackened off and cable loose to both sides and when on, turns backwards fine and still the same dragging/resistance going forward. So looks like I'll be taking it off. There is a slight weep from the 8 axle face bolts so it needs attention anyway. So close to finishing a project which is rare for me! This is the last hurdle.



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