HELP! 72 c10 Rear Wheel Cylinder? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

orangek5 · 12-28-2008, 08:30 PM

I am trying to replace the rear wheel cylinders on my c-10. I purchased a pair at our local auto chain and they barely did not fit. I took them back and accroding to their computers they gave me the correct part numbers. Has anyone done this and had to modify the cylinder casting a little or did I have the wrong wheel cylinders. The numbers on the castings of the wheel cylinders that I took off are 6459 649

cdowns · 12-28-2008, 09:35 PM

what does barely dont fit mean? if its where they go into the backing plate they sometimes require dressing the casting with a file and the backing plate holes sometimes have rust build up from 40years they are upposed to b a tight fit in the hole

orangek5 · 12-28-2008, 09:57 PM

Quote:

Originally Posted by cdowns

what does barely dont fit mean? if its where they go into the backing plate they sometimes require dressing the casting with a file and the backing plate holes sometimes have rust build up from 40years they are upposed to b a tight fit in the hole

That is exactlly right, But the casting in the new ones are just a little bit larger at about 10 o clock and 2 o clock from the threaded mounting holes. have they changed a little do to after market and time? Just file those or should the new ones look exactlly like what I took off or

jcnalley · 12-28-2008, 10:04 PM

If the casting on the wheel cylinder is a little bigger than the backing plate....I would file the backing plate a little at a time until the wheel cylinder fit. Do the mounting bolts line up with the backing plate?

orangek5 · 12-28-2008, 10:16 PM

Im not sure. I did not try to install the bolts I tried to install and noticed it was not going to slip into the backing plate so I just compared it to the old one and there was some differences so I box them up and took them back to the O'------. I am going to try to go to a Chevy Dealer ship and take the old one with me to see if they can cross the Casting #'s and see what they offer for a replacment $$.

Just wanted to pick some brains before I did this

Thanks to those who looked and responded

orangek5 · 12-29-2008, 12:21 AM

Quote:

Originally Posted by orangek5

Just wanted to pick some brains before I did this

Thanks to those who looked and responded

Again

Tx Firefighter · 12-28-2008, 09:42 PM

Have the pistons extended out of the cylinders some and need squeezing back inside the bore ?

PanelDeland · 12-28-2008, 10:23 PM

IIRC there are regular and heavy duty brakes.It may be possible that there is a difference between the two.I have gotten a wheel cyl that did not have one of the bolt holes tapped.I had a heck of a time with it but learned to always check threaded holes before trying to install a part.

orangek5 · 12-28-2008, 10:44 PM

I know the there is some with a 1 1/8" bore and the ones that I have with a
1" bore. It just seems to be the castings that did not want to fit in the backing plate hole do to extra material around the threaded holes, the fluid line hole and the mounting holes looked correct "with my eyes".

Bus Ted Knuckle · 12-28-2008, 11:02 PM

file the back of the wheel cylinder until they fit, this is a common problem. It will not take much.

12-28-2008, 08:30 PM	#1
orangek5 Registered User Join Date: Nov 2008 Location: Rose Hill Ks Posts: 290	HELP! 72 c10 Rear Wheel Cylinder? I am trying to replace the rear wheel cylinders on my c-10. I purchased a pair at our local auto chain and they barely did not fit. I took them back and accroding to their computers they gave me the correct part numbers. Has anyone done this and had to modify the cylinder casting a little or did I have the wrong wheel cylinders. The numbers on the castings of the wheel cylinders that I took off are 6459 649 __________________ 1970 Jimmy 4x4 IL6 1971 Jimmy 4x4 350ci v8 1971 SWB 327ci v8 1972 Short Stepside 305ci v8 1972 Blazer 2WD CST LS9 350ci 4sp 1999 4 Door LB 1 Ton Old Body Style 5.7 v8

12-28-2008, 09:35 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: HELP! 72 c10 Rear Wheel Cylinder? what does barely dont fit mean? if its where they go into the backing plate they sometimes require dressing the casting with a file and the backing plate holes sometimes have rust build up from 40years they are upposed to b a tight fit in the hole __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-28-2008, 10:04 PM	#4
jcnalley Registered User Join Date: Jul 2007 Location: Rockingham,NC Posts: 31	Re: HELP! 72 c10 Rear Wheel Cylinder? If the casting on the wheel cylinder is a little bigger than the backing plate....I would file the backing plate a little at a time until the wheel cylinder fit. Do the mounting bolts line up with the backing plate?

12-28-2008, 10:16 PM	#5
orangek5 Registered User Join Date: Nov 2008 Location: Rose Hill Ks Posts: 290	Re: HELP! 72 c10 Rear Wheel Cylinder? Im not sure. I did not try to install the bolts I tried to install and noticed it was not going to slip into the backing plate so I just compared it to the old one and there was some differences so I box them up and took them back to the O'------. I am going to try to go to a Chevy Dealer ship and take the old one with me to see if they can cross the Casting #'s and see what they offer for a replacment $$. Just wanted to pick some brains before I did this Thanks to those who looked and responded __________________ 1970 Jimmy 4x4 IL6 1971 Jimmy 4x4 350ci v8 1971 SWB 327ci v8 1972 Short Stepside 305ci v8 1972 Blazer 2WD CST LS9 350ci 4sp 1999 4 Door LB 1 Ton Old Body Style 5.7 v8

12-28-2008, 09:42 PM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: HELP! 72 c10 Rear Wheel Cylinder? Have the pistons extended out of the cylinders some and need squeezing back inside the bore ? __________________ I'm on the Instagram- @Gearhead_Kevin

12-28-2008, 10:23 PM	#8
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: HELP! 72 c10 Rear Wheel Cylinder? IIRC there are regular and heavy duty brakes.It may be possible that there is a difference between the two.I have gotten a wheel cyl that did not have one of the bolt holes tapped.I had a heck of a time with it but learned to always check threaded holes before trying to install a part. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

12-28-2008, 10:44 PM	#9
orangek5 Registered User Join Date: Nov 2008 Location: Rose Hill Ks Posts: 290	Re: HELP! 72 c10 Rear Wheel Cylinder? I know the there is some with a 1 1/8" bore and the ones that I have with a 1" bore. It just seems to be the castings that did not want to fit in the backing plate hole do to extra material around the threaded holes, the fluid line hole and the mounting holes looked correct "with my eyes". __________________ 1970 Jimmy 4x4 IL6 1971 Jimmy 4x4 350ci v8 1971 SWB 327ci v8 1972 Short Stepside 305ci v8 1972 Blazer 2WD CST LS9 350ci 4sp 1999 4 Door LB 1 Ton Old Body Style 5.7 v8

12-28-2008, 11:02 PM	#10
Bus Ted Knuckle Son of a gun Join Date: Jan 2007 Location: Hot Springs, Arkansas Posts: 1,636	Re: HELP! 72 c10 Rear Wheel Cylinder? file the back of the wheel cylinder until they fit, this is a common problem. It will not take much. __________________ Bill BEATERS ARE NEATER

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