Brake Proportioning Valve Question?

[johnnywagon]

I know most serious 1st gen. 4x4 Blazer guys have converted to Hydro-boost, but I was wondering if any one has had any luck/experience with removing the proportioning valve or replacing it w/a universal adjustable valve?

[Yukon Jack]

I'm I correct to assume you are disk front/drum rear? My 69 K20 is drums all around and I did not add a prop valve when I swapped in the hydroboost. Works well for me but I'm sure if you are disks and drums you will need a prop valve. I think Burt4x4 has an aftermarket prop valve on his K5.

[johnnywagon]

Originally Posted by Yukon Jack

I'm I correct to assume you are disk front/drum rear? My 69 K20 is drums all around and I did not add a prop valve when I swapped in the hydroboost. Works well for me but I'm sure if you are disks and drums you will need a prop valve. I think Burt4x4 has an aftermarket prop valve on his K5.

Oops, I should have been more specific. I'm not planning on going hydroboost (not yet anyway). I've been doing some research and I'm thinking of putting a dual-diaphram booster/master cylinder on my Blazer in place of the old single diaphram booster. The bigger boosters came on same year one ton pickups and I'm pretty sure I can make it fit. I guess I'll reuse the p-valve at first and see what happens.

[Burt4x4]

Nope I have the factory p-valve.
I upgraded to the 1ton double diaphram booster/master combo, pictured above. Was a direct bolt in deal except I had to get new lines from the master to P-valve as the 1Ton setup plumbs opposite of the 1/2 ton setup. In-line tube sells the lines for like 25bucks.
This setup DOUBLED my stopping power!! I can actuall lock up all 4 tires now! No way in H*** I could have done that with the 1/2 ton stuff.

BUTT ~ now I have a D60 w/14FFdisk and I am only assuming my brakes will be the same as I have yet to bleed the new calipers/axels and test drive it but by Monday I will beable to tell you if this 1Tonsetup with factory P-valve works as good or not....
to be continued...

[msgross]

What's the green thing behind your booster...

[johnnywagon]

[QUOTE=Burt4x4;2260011][IMG]http://www.norcalbigdawgs.net/Gallery/albums/albuo05/P1010005.jpg[/IMG]
"Nope I have the factory p-valve.
I upgraded to the 1ton double diaphram booster/master combo, pictured above."

Ah, great minds think alike.

On the left is a stock 71 blazer set up. On the right is a 71 one ton pickup set up. Working in a parts store sure has its benefits. Good to know it worked for you.

[Misled]

[QUOTE=johnnywagon;2260049]

Originally Posted by Burt4x4

[IMG]

Originally Posted by Burt4x4

http://www.norcalbigdawgs.net/Gallery/albums/albuo05/P1010005.jpg[/IMG]
"Nope I have the factory p-valve.
I upgraded to the 1ton double diaphram booster/master combo, pictured above."

Ah, great minds think alike.

On the left is a stock 71 blazer set up. On the right is a 71 one ton pickup set up. Working in a parts store sure has its benefits. Good to know it worked for you.

johnnywagon,
Can you give me part numbers, prices, source for that one on the right?

Thanks,

Misled

[johnnywagon]

[QUOTE=Misled;2260059]

Originally Posted by johnnywagon

[B][U]

johnnywagon,
Can you give me part numbers, prices, source for that one on the right?

Thanks,

Misled

Its a remanufactured unit from A1 CARDONE. #50-1007.
OR just have your local parts store look up a vacuum booster/master cylinder combo for a 71 or 72 1-ton full size 4x4 pick-up. Like Burt said you will have to make new brake lines, also the booster mounting studs are a little wider on the on the one ton, but the firewall brackets can be "massaged" to work.