Dual diaphragm brake booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70blackfish · 12-24-2012, 01:46 AM

how is the brake pedal feel on a dual Diaphragm booster? does it make the pedal to touchy ?

and what size booster to get.8" 9" or stay with the stock size of 11"

68gmsee · 12-24-2012, 10:18 AM

I had the dual on my 69 and have a single on my 68. Both drum/drum. I don't have my 69 together anymore but I don't remember a difference in feel.

If the brakes are bled and adjusted properly and the pushrod on both the pedal to booster and booster to master cylinder are adjusted properly there won't be any noticeable difference.

Maybe somone else can chime in on disc/drum or other difference in the feel of the pedal.

THE BOSS · 12-24-2012, 10:55 AM

i switched my 72 to the dual diaphragm like the one that comes on a stock 72 3/4 ton 4WD.

if you buy a booster (if memory serves me correct) you have to buy a master cylinder also. then the lines from the master to the proportioning valve are different.

I did mine, no big noticeable difference.

remember your dealing with 40+ year old brake technology, they dont stop like a sports car.

Dads69C10 · 12-24-2012, 11:19 AM

I have an 11" dual from TuffStuff. My truck stops great with discs in the front. If I had to do it again I might have chosen a single because the dual sticks out quite a bit into the engine bay

12-24-2012, 01:46 AM	#1
70blackfish Registered User Join Date: Oct 2012 Location: Newhall CA Posts: 1,195	Dual diaphragm brake booster how is the brake pedal feel on a dual Diaphragm booster? does it make the pedal to touchy ? and what size booster to get.8" 9" or stay with the stock size of 11" Attached Images __________________ 69 SWB 780hp Hellcat powered, manual 6 speed, currie 9

12-24-2012, 10:18 AM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Dual diaphragm brake booster I had the dual on my 69 and have a single on my 68. Both drum/drum. I don't have my 69 together anymore but I don't remember a difference in feel. If the brakes are bled and adjusted properly and the pushrod on both the pedal to booster and booster to master cylinder are adjusted properly there won't be any noticeable difference. Maybe somone else can chime in on disc/drum or other difference in the feel of the pedal. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... Last edited by 68gmsee; 12-24-2012 at 10:24 AM.

12-24-2012, 10:55 AM	#3
THE BOSS Registered User Join Date: Jun 2012 Location: Kalamazoo MI Posts: 104	Re: Dual diaphragm brake booster i switched my 72 to the dual diaphragm like the one that comes on a stock 72 3/4 ton 4WD. if you buy a booster (if memory serves me correct) you have to buy a master cylinder also. then the lines from the master to the proportioning valve are different. I did mine, no big noticeable difference. remember your dealing with 40+ year old brake technology, they dont stop like a sports car.

12-24-2012, 11:19 AM	#4
Dads69C10 Registered User Join Date: Aug 2009 Location: El Paso, Tx Posts: 180	Re: Dual diaphragm brake booster I have an 11" dual from TuffStuff. My truck stops great with discs in the front. If I had to do it again I might have chosen a single because the dual sticks out quite a bit into the engine bay __________________ 1969 C10 stepside 1973 Cheyenne Blazer



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