Help with brakes

[idastang]

This is a 69 short bed 4x4. In a previous post with a questions about shocks, it got nicknamed mutt and rightly so. As I make progress to get mutt going down the road, every test drive develops a new problem. The issue at hand is the following, after replacing the rear wheel cylinders, the brakes lock up in the rear. I tend to belive this is because they where not working before I replaced the leaking wheel cylinders. So I thought it would be best just to check the complete brake system out. Long story short, replaced front calipers, (front being a d44 from a 76 k5 based on the bom) and since the master was full of crap, id it as being from a 72 with power booster. Ordered from napa part number up 36280. This is a dual bowl with booth bowls of equal size. Just before putting things back together I wanted to check out the proprotioning valve. With some research on this site and others, its a distribution block. Ok I know I will need to now get a p/v, but the question is can I use the current m/c? I don't know if its a disc/drum m/c or a drum/drum mc. I am sure the po is having a good laugh by now I have already bench bleed the m/c, I am not sure if napa will allow me to do a return. If so does anyone have a part number for a disc/drum,deep bore m/c? Thanks for the help.

[Wrenchbender Ret]

If the M/C is for a 72 it is disc/drum. All chevy trucks had front discs after 1970.

[idastang]

Thanks wrenchbender. I am glad to hear it should work, my concern was looking at others with pictures on this site, the one I have is farily large with the deep bore. From what I have read, the deep bore style is for non-power while the close to flush pistons are for power. The power booster however has the pushrod extending out about an 1 inch. It took me almost a week of searching and hours at the part store to come up with this m/c. All the power m/c at the parts stores had the flush type plunger. So now all I need is the p/v and I should be good to go. Question ; I have seen the p/v from some sites that look to be a replacement part ( price range from $50.00-$90.00, all look the same) and then origanal style from $175.00. Are the replacements just as good? Thanks

[grs]

Did you replace the rear shoes? I was told that brake fluid on the shoes can cause the brakes to lock. I don't know if that is true or not.

[OhOneWS6]

Originally Posted by grs

Did you replace the rear shoes? I was told that brake fluid on the shoes can cause the brakes to lock. I don't know if that is true or not.

Absolutely that is true. Any type of contamination on the shoes can cause them to lock up.