Brake tech questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mplex2000 · 10-04-2005, 10:09 AM

Hey all, let's see if anybody knows these nitty gritty details.

I pulled my gigantic stock booster and stock m/c from my 69. Already sold it off on Ebay,should have waited...oh well.

I have a new 8" dual booster and vette type m/c. I also got all new hardlines from Inline Tube.

Problem is the new m/c has 3/8" ports (as does the new prop valve) which is much smaller than stock lines.

I need to get the appropriate m/c and prop valve. I called Inline Tube and they tell me the sizes between the m/c and valve are 1/2"-20 and 9/16"-18.

I don't have the parts in front of me - can anybody tell me what sizes go where?

Americanrider · 10-04-2005, 11:10 AM

I'll see if I can some more pics today.

mplex2000 · 10-04-2005, 11:13 AM

Seems that when I was looking at the lines from Inline Tube, 3 of the fittings were the same and one was larger. Kind of hard to tell from the pic though. Thanks for posting!

Americanrider · 10-12-2005, 01:25 AM

Sorry I took so long to get back with ya. Here we go...

Large line hooks into the front chamber to P-valve, small line goes to the rear chamber.

Out of the rear of the P-valve the large line feeds the rear brakes running down to the frame, across the front axle and to the back along the right frame rail.

Out of the front bottom of the P-valve the smaller line goes down to the junction and T's off, one to each side of the front brakes.

These pics are from a 71 with disk fronts. Need anything else? If so PM me.

mplex2000 · 10-12-2005, 08:45 AM

VERY cool. Thanks dude. This will teach me to tear everything out before taking pics...of course, I should have learned that many projects ago :P

10-04-2005, 10:09 AM	#1
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	Brake tech questions Hey all, let's see if anybody knows these nitty gritty details. I pulled my gigantic stock booster and stock m/c from my 69. Already sold it off on Ebay,should have waited...oh well. I have a new 8" dual booster and vette type m/c. I also got all new hardlines from Inline Tube. Problem is the new m/c has 3/8" ports (as does the new prop valve) which is much smaller than stock lines. I need to get the appropriate m/c and prop valve. I called Inline Tube and they tell me the sizes between the m/c and valve are 1/2"-20 and 9/16"-18. I don't have the parts in front of me - can anybody tell me what sizes go where?

10-04-2005, 11:10 AM	#2
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	I'll see if I can some more pics today. Attached Images

10-12-2005, 01:25 AM	#4
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Sorry I took so long to get back with ya. Here we go... Large line hooks into the front chamber to P-valve, small line goes to the rear chamber. Out of the rear of the P-valve the large line feeds the rear brakes running down to the frame, across the front axle and to the back along the right frame rail. Out of the front bottom of the P-valve the smaller line goes down to the junction and T's off, one to each side of the front brakes. These pics are from a 71 with disk fronts. Need anything else? If so PM me. Attached Images

10-04-2005, 11:13 AM	#3
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	Seems that when I was looking at the lines from Inline Tube, 3 of the fittings were the same and one was larger. Kind of hard to tell from the pic though. Thanks for posting!

10-12-2005, 08:45 AM	#5
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	VERY cool. Thanks dude. This will teach me to tear everything out before taking pics...of course, I should have learned that many projects ago :P



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