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| | | | Joined: Dec 2007 Posts: 171 Shop Shark | | Shop Shark Joined: Dec 2007 Posts: 171 | I am working through my local NAPA and Carquest parts stores to locate new wheel cylinders for my early 1947 GMC EC-302 truck. It appears that front cylinders are available. It does not appear that a direct replacement rear wheel cylinder is available. Carquest asked me to find out if a 1946 1 ton rear wheel cylinder is a possible/suitable replacement. Does anyone here have experience with interchange of wheel cylinder parts? Also, would it be a good idea to use the original type DOT brake fluid or would the synthetic brake fluid be a good update? Any help on these questions is appreciated.
Al | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Big Al's, according to my Raybestos catalog the part number for the rear wheel cylinders for your truck is WC3677, that part is still available at RockAuto $65.79, at Napa the part number is UP3677 $47.25, hope that helps. | | | | | Joined: Mar 2004 Posts: 6,236 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,236 | The wheel cylinders are not the same, 1-ton use a 1-3/8" bore (casting number 5450072) and the 1-1/2 & 2 ton use 1-1/2" bore (casting number 5300892). If these are not available you can have your existing cylinders sleeved and new kits installed. Mike B  | | | | | Joined: Dec 2007 Posts: 171 Shop Shark | | Shop Shark Joined: Dec 2007 Posts: 171 | Hello Mike and 3B, Thanks for the rear brake cylinder part and casting numbers. That specific information will be a good help as I hunt down new replacement cylinders.
Al | | |
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