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#1 |
Registered User
Join Date: Jun 2013
Location: Sacto, CA
Posts: 43
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Difference in front drums from 68 to 69?
Can anybody confirm that 68 front drums had the "anti-vibration spring" while the 69 front drums did not?
For that matter, can anyone tell me if there's a significant difference between the hubs and drums for these years? A while back I purchased some 69s (per seller) with the "a-v" spring. Recently someone indicated that only 68s came with the spring. Just trying to learn what's correct, and then if it really even matters (because, basically, they may be interchangeable?). |
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#2 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Difference in front drums from 68 to 69?
My 1970 and 1968 both have them all away around the hubs. I don't know if they are suppose to have them or not but they both do.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#3 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Difference in front drums from 68 to 69?
I think any replacement drums you buy at the store may not have them at all, but don't have any data to verify that.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#4 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Difference in front drums from 68 to 69?
Spring was used through 70 to my knowledge, all my early trucks had or have them
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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#5 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: Difference in front drums from 68 to 69?
The drums are the same thru 70. I dont think everyone reused the av springs. I have a 67 and my av rings are missing. I dont notice any vibrating though at all
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1967custom |
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#6 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Re: Difference in front drums from 68 to 69?
My '69 had the springs on the drums all the way around.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#7 |
Registered User
Join Date: Jun 2013
Location: Sacto, CA
Posts: 43
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Re: Difference in front drums from 68 to 69?
Cool, thanks for the feedback. Y'all said pretty much what I thought - there's no real evidence either way.
So the seller said they were 69s, they must be 69s. |
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#8 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Re: Difference in front drums from 68 to 69?
It seems pretty clear to me that they ALL had the anti-vibration spring through 70. And that was confirmed by everybody who posted...
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#9 |
Registered User
Join Date: Jun 2013
Location: Sacto, CA
Posts: 43
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Re: Difference in front drums from 68 to 69?
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#10 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Re: Difference in front drums from 68 to 69?
Ahh. That makes more sense!
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#11 |
Registered User
Join Date: Jan 2013
Location: Mickleton, NJ
Posts: 1,776
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Re: Difference in front drums from 68 to 69?
My 70 had the springs on the front when I got it, but none on the back. I put replacement drums on it and they didn't come with the springs.
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Shawn 1970 Chevy C-10 SWB, 350, TKO 600 5 speed My build http://67-72chevytrucks.com/vboard/s...d.php?t=559881 |
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#12 |
Registered User
Join Date: Nov 2014
Location: Sherwood, AR
Posts: 189
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Re: Difference in front drums from 68 to 69?
I took a wheel off the other day in order to begin figuring out why the brakes on working at all on the old truck. Saw these springs wrapped around the drums and had no idea what they were.
Should I leave them on when I'm done working the brakes? Or can they be discarded?
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Brian '69 GMC C15 Inline 6, 230ci (possibly 250ci) |
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#13 |
Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,644
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Leave them in place as they not only held prevent chattering / squeaking of the brake shoes , they also help dissipate heat , this is *very* important indeed .
They were gone missing off my '69 so I had to go find them in the junk yard , once again they asked me " why the hell does ONLY YOU buy this weird stuff ?! " Because of course , I DRIVE and WORK my Light Duty CHEVROLET TRUCK and I accept no compromises ~ if I did I'd prolly have a Brand 'F' truck ~ GAH .
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH ![]() |
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#14 | |
Registered User
Join Date: Nov 2014
Location: Sherwood, AR
Posts: 189
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Re: Brake Drum Springs
Quote:
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Brian '69 GMC C15 Inline 6, 230ci (possibly 250ci) |
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#15 |
Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,644
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Correct ;
They just sit there in a casted in groove . DON'T take them off because once in a while they're bugger all to get back into place ![]() OBTW : you should not ' turn ' or ' machine ' the brake drums unless they're severely bell mouthed or so badly warped the brake pedal pulsates under your foot . This is directly from my BENDIX (the good Folks who engineered the drum bakes on your old Chevy Truck) Factory training ! turning and machining brake drums reduces their ability to dissipate heat , always a very bad thing on drum brakes indeed . Dealers & Shops like to insist upon it because it's easy money and sells lots of new drums . Once in a while the Customer runs the brake shoes metal to metal , then what ? . Simple : take some 600 grit sand paper and smooth up the sharp ridges then re assemble with your new shoes and do a gentle break in by making numerous slow (- 35 MPH) stops , in a few blocks the shoes will be fully bedded in , if you have the original automatic brake adjusters , just back up and make _complete_ quick stops a few times and they're done . Other wise manually adjust the brakes until there's nu ' SH , SH ' sound coming from the shoes against the drums ~ this tiny bit of clearance is critical to prevent heat buildup as you drive . Most ' mechanics ' (feh) adjust brake shoes to a light drag , this is wrong and dangerous to boot . I hope this is helpful .
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH ![]() |
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#16 |
Registered User
Join Date: Nov 2014
Location: Sherwood, AR
Posts: 189
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Re: Difference in front drums from 68 to 69?
Very helpful, thanks!
I haven't had a chance to dive into the breaks yet so all I know right now is when we pulled it across the yard (slowly) to get it next to the shop, we found it we had zero breaking. Pedal goes go the floor. Checked the reservoir and confirmed there is fluid but that's all I can tell you at this point. Have been focusing on getting the engine to run up to this point. I'll be pulling off drums and checking lines hopefully this weekend.
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Brian '69 GMC C15 Inline 6, 230ci (possibly 250ci) |
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#17 |
Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,644
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Be smart and replace all four wheel cylinders , three flex hoses and prolly the master cylinder too ~ your LIFE depends on good brakes .
When you're cleaning the various hydraulic parts , only THREE things may be used ~ alcohol , brake cleaner or brake fluid . NOTHING ELSE as any other chemicals will attack the rubber seals , you cannot clean them after they've been washed in gasoline , wd-40 etc. Have fun and remember : only take ONE SIDE apart at a time ! you're going to have it apart a while waiting parts and leaving the opposite side assembled , allows you to look at it and figure out where all those little parts go .
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH ![]() |
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#18 | |
Registered User
Join Date: Nov 2014
Location: Sherwood, AR
Posts: 189
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Re: Routine Brake Service
Quote:
Eventually all of the braking system will be restored and fully functional. For now I'm just shooting to get some semblance of braking so I can move it in and out of the shop under it's own power. That way I'm not stuck working on it in the yard. LOL Of course I want it safe and roadworthy at some point, but I know that that is a LONG ways away. I'll be happy if I can just drive it across the yard (and stop) at 5 MPH.
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Brian '69 GMC C15 Inline 6, 230ci (possibly 250ci) |
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