| 80mm front caliper conversion question [message #338121] |
Thu, 25 October 2018 15:15  |
sandy trout
Messages: 51
Registered: October 2018
Location: texas
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I plan on switching front calipers over to the aftermarket 80mm.
I found the calipers at Autozone, they changed numbers for the right caliper to C531 and the left one is C530, the old numbers show when you bring up the part. Autozone has no description on these but if you go to Napa, they have a left and right and using left as an example, the SEL4674 which has a 3 5/32" piston and another left one CAL4678 has a 2 15/16" piston. Which piston size would be better, I am replacing the the booster with a sensitized booster and a 34mm master cylinder as i intend to change the rear brakes to discs.
Also the brake hoses at Autozone (77320 and 77421 ) show a GVW of 7500 to 8000. Is this safe?
All this is going on a 78 GMC that was apparently one of the last ones out of the factory that left as a shell and was finished by an outside supplier. It has no model number I can find and has kitchen on the right side and a bathroom with separate shower on the left side.
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