master cylinder 71 72 disc question
 

I went to autozone to get a new master cylinder and they asked all the normal computer questions except if the truck had manual or power brakes.When I questioned him about this he said there was only one part number for all 1/2 ton 71 and 72 and that it didn't matter if it was manual or power.When I look in all the catalogs like LMC , etc they all show two different numbers so what is the deal and who is correct?

thanks Mike

Re: master cylinder 71 72 disc question
 

NAPA lists the same master cylinder for both manual and power for both 1971 and 1972 1/2 tons.

Re: master cylinder 71 72 disc question
 

there is only one, the power booster is only an assist to the braking system that already exist in the truck, power and non power MC's are the same

now, there is a difference between disc/drum, drum/drum, and disc/disc master cylinders because disc brakes require a higher volume of fluid to work, therefore the resivoirs are bigger

Re: master cylinder 71 72 disc question
 

I went to buy a master cylinder for my '72 1/2-ton 4x4 recently and they couldn't decide if it should be a 1-1/8" bore or 1-1/4" bore. Is 1-1/8" bore for 1/2-ton trucks and 1-1/4" bore for 3/4-ton trucks?

Re: master cylinder 71 72 disc question
 

thanks for the answers

Mike

Re: master cylinder 71 72 disc question