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| | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | Just put all new drums, shoes, cylinders and hoses on my '69 C10, no power brakes.
When you press the brake pedal it vibrates badly, seems to be a higher frequency than what I've experienced with warped rotors. Is there some other possible cause or is it simply warped drums (out of round)? Doesn't do it when using the parking brake so presume it must be the front, can't tell if it's both or just one, doesn't seem to pull to one side or the other.
New drums from the Irish chain, obviously expected them to be perfectly smooth. Any help appreciated.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
| | | | | Joined: Apr 2005 Posts: 2,101 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,101 | It sounds very much like what you described to be an out of round drum. If you have an auto parts store locally that can turn drums have them set them up and check the runout. Generally if it is that far out even turning it probably wouldn't work. Plus it shouldn't be necessary to turn a new drum. Since it's new, the supplier should replace it.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | You may not have a drum seated on the hub good. If the old ones were hold on with rivets and you knocked the heads off the rivets they might not letting the new drum seat good.
George
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Sep 2011 Posts: 1,458 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,458 | You may not have a drum seated on the hub good. If the old ones were hold on with rivets and you knocked the heads off the rivets they might not letting the new drum seat good.
George X2, have seen that.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Mar 2004 Posts: 6,232 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,232 | Could it be a loose rim on the hub...are all of the lug nuts tight? Mike B  | | | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | Having the new replacement drums checked for runout tomorrow morning, and then swapped with the shaker versions on Friday. Will report with findings then.
I'm thinking an installation issue as, while not impossible, warped new drums seems unlikely. Thanks for the feedback.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
| | | | | Joined: Feb 2000 Posts: 988 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 988 | Did you spray down the drums with Brake Cleaner before installing them? Just wondering if they were coated like rotors and now your shoes are grabbing?
Brian Moore
1949 3100 5 window Deluxe
"Today is better than yesterday, but not as good as tomorrow"
| | | | | Joined: Oct 2009 Posts: 201 Shop Shark | | Shop Shark Joined: Oct 2009 Posts: 201 | quote=Wrenchbender Ret.]You may not have a drum seated on the hub good. If the old ones were hold on with rivets and you knocked the heads off the rivets they might not letting the new drum seat good.
George[/quote]
Winner winner chicken dinner.
They're looking for drums with the integral hub, not so much of a seating issue as a concentric issue.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
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