Power brake conversion question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Misstur_big · 11-28-2006, 08:35 AM

I converted to power frt. disc and drum rear on my 67. I started out with a factory style booster but I dident like the look or feel. I purchased a aftermarket unit 9" booster with a vette style master cylinder. It also has one of those self adjusting prop valves.
The pedal feels a little hard too me. It is the same feeling I had with the factory unit. I do have a check valve installed for the booster so thats not the problem. I am running a Gen 3 engine 5.7.
Do you think I am just not generating enough vaccum with this motor?
I dont have any problems stopping. It just feels like there's not enough travel in the pedal.
I just wondering if anyone else has made this conversion with a Gen 3 engine is experiancing the same issue.
Thanks for the feedback

cableguy0 · 11-28-2006, 08:38 AM

what size line are you using to the booster and is it hooked to a full manifold vacuum source? that engine stock should make more than enough vacuum.will the truck lock the brakes up? or does it glide to a stop

11-28-2006, 08:35 AM	#1
Misstur_big Junior Member Join Date: Nov 2006 Location: shreveport louisiana Posts: 27	Power brake conversion question I converted to power frt. disc and drum rear on my 67. I started out with a factory style booster but I dident like the look or feel. I purchased a aftermarket unit 9" booster with a vette style master cylinder. It also has one of those self adjusting prop valves. The pedal feels a little hard too me. It is the same feeling I had with the factory unit. I do have a check valve installed for the booster so thats not the problem. I am running a Gen 3 engine 5.7. Do you think I am just not generating enough vaccum with this motor? I dont have any problems stopping. It just feels like there's not enough travel in the pedal. I just wondering if anyone else has made this conversion with a Gen 3 engine is experiancing the same issue. Thanks for the feedback

11-28-2006, 08:38 AM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Power brake conversion question what size line are you using to the booster and is it hooked to a full manifold vacuum source? that engine stock should make more than enough vacuum.will the truck lock the brakes up? or does it glide to a stop __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

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