c20 front drums removal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nrb's70gmc · 07-12-2018, 06:15 PM

Hello everyone quick question

i need to get access to the wheel studs on front of my truck
i pulled the dust cover -spindle nut-the notched washer-2 flat head screws

now im stuck how in the heck does the drum come off? i cant get the bearings our couse i cant get a good grip on them.

the drum budges a tiny bit but thats it

**Steeveedee** · 07-12-2018, 08:44 PM

There is probably a small ridge at the inside edge of the drum where the brake shoes don't rub it and wear the drum. You will have to back off the adjusters.

nrb's70gmc · 07-12-2018, 09:50 PM

Quote:

Originally Posted by Steeveedee

There is probably a small ridge at the inside edge of the drum where the brake shoes don't rub it and wear the drum. You will have to back off the adjusters.

Might be a dumb question but which way should I spin the adjusting knob?
Up or down to back off?

**WorkinLonghorn** · 07-12-2018, 10:06 PM

I can't remember off-hand but you turn them one way and it will either solve your problem or make the drum hard to turn, in which case you go the other way. -BA

nrb's70gmc · 07-13-2018, 12:05 PM

ware the heck is the adjustment slot on front drums? dont see anything on backing plate

**Steeveedee** · 07-13-2018, 01:37 PM

It may have never been knocked out. Look for an indentation about an inch long and 1/4" wide. Might be a little bigger each way. Should be in the backing plate, though some drums have the knockout as well.

nrb's70gmc · 07-13-2018, 02:22 PM

I got it. There are 4 untapped holes on drum face wedged a flat head in them and walked it off

Now is the spindle supposed to slide off? Tried pulling it but there is some resistance.

**Steeveedee** · 07-13-2018, 04:01 PM

Once you back the adjusters off, the drum should come off. If you meant that the hub should come off, yes it should, since you have the spindle nut removed. The bearings may be a bit tight on the spindle, so make take some persuading.

07-12-2018, 06:15 PM	#1
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	c20 front drums removal Hello everyone quick question i need to get access to the wheel studs on front of my truck i pulled the dust cover -spindle nut-the notched washer-2 flat head screws now im stuck how in the heck does the drum come off? i cant get the bearings our couse i cant get a good grip on them. the drum budges a tiny bit but thats it __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

07-12-2018, 08:44 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,088	Re: c20 front drums removal There is probably a small ridge at the inside edge of the drum where the brake shoes don't rub it and wear the drum. You will have to back off the adjusters. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-12-2018, 10:06 PM	#4
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,855	Re: c20 front drums removal I can't remember off-hand but you turn them one way and it will either solve your problem or make the drum hard to turn, in which case you go the other way. -BA __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

07-13-2018, 12:05 PM	#5
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	Re: c20 front drums removal ware the heck is the adjustment slot on front drums? dont see anything on backing plate __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

07-13-2018, 01:37 PM	#6
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,088	Re: c20 front drums removal It may have never been knocked out. Look for an indentation about an inch long and 1/4" wide. Might be a little bigger each way. Should be in the backing plate, though some drums have the knockout as well. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-13-2018, 02:22 PM	#7
nrb's70gmc Registered User Join Date: Sep 2008 Location: magalia,ca Posts: 366	Re: c20 front drums removal I got it. There are 4 untapped holes on drum face wedged a flat head in them and walked it off Now is the spindle supposed to slide off? Tried pulling it but there is some resistance. __________________ 1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

07-13-2018, 04:01 PM	#8
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,088	Re: c20 front drums removal Once you back the adjusters off, the drum should come off. If you meant that the hub should come off, yes it should, since you have the spindle nut removed. The bearings may be a bit tight on the spindle, so make take some persuading. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA



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