Power Brake Vacuum
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Senior User
Joined: Oct 2013
Posts: 345
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From: Yorkville Indiana
Power Brake Vacuum
I'm in the process of redoing my brake system on the 54 F100. It had under the floor power brakes with a Mustang master cylinder, 4 wheel drum brakes installed by the PO. I'm replacing everything from the pedal out including the booster to install front disc brakes. My question is how did you all run vacuum to the booster. Who ever installed the previous power brake kit ran 3/8 fuel line hose from the engine down underneath to the booster. I'm thinking that the fuel line can colasp under vacuum. Should I run some othe type hose or try to plumb it in metal line with short hoses on each end. What I'm really after is what hose should I use that won't colasp. AC hose maybe ?
I have the old bracket, booster, master cyl up for grabs if anyone can use it.
PM me on the booster etc
I have the old bracket, booster, master cyl up for grabs if anyone can use it.
PM me on the booster etc
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Senior User
Joined: Oct 2013
Posts: 345
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From: Yorkville Indiana
I'll check it out, Thanks. On newer production cars that still have boosters I have notice the hose is rather heavy wall unlike most ordinary vacuum hose which is usually thin walled and no reinforcement.
Hotshot
Joined: Oct 2009
Posts: 16,173
Likes: 4,781
From: Burbank, WA
Real power brake vacuum hose is specially designed and reinforced, and is DOT approved. It is also a special size, 11/32, so you can't/not supposed to use something improper. The stuff isn't cheap so you probably won't want to run rubber hose from the engine to the booster under the floor. The big trucks that had power brakes used a hard steel line from a firewall connector to the booster behind the pedal assembly.
Senior User
Joined: Jun 2011
Posts: 195
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From: Fresno, California
I'm planning on running a hard line, probably stainless, since that's what I have, with short rubber lines on each end on my 53. Primarily because rubber hoses that long do tend to get chewed up, oil soaked or burned up in one way or another over time.
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Senior User
Joined: Oct 2013
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From: Yorkville Indiana
I plan to run steel line with rubber hose on each end, now finding the correct hose. Safety first...
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Elder User
Joined: Mar 2012
Posts: 787
Likes: 1
From: Prescott AZ.
I am running rubber power brake hose but did one extra thing. I put a vacuum canister in line with it's own check valve. I am running a bit of a cam and I wanted to make sure that I always had sufficient vacuum to the booster.
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Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
I'm in the process of redoing my brake system on the 54 F100. It had under the floor power brakes with a Mustang master cylinder, 4 wheel drum brakes installed by the PO. I'm replacing everything from the pedal out including the booster to install front disc brakes. My question is how did you all run vacuum to the booster. Who ever installed the previous power brake kit ran 3/8 fuel line hose from the engine down underneath to the booster. I'm thinking that the fuel line can colasp under vacuum. Should I run some othe type hose or try to plumb it in metal line with short hoses on each end. What I'm really after is what hose should I use that won't colasp. AC hose maybe ?
I have the old bracket, booster, master cyl up for grabs if anyone can use it.
PM me on the booster etc
I have the old bracket, booster, master cyl up for grabs if anyone can use it.
PM me on the booster etc
Hotshot
Joined: Oct 2009
Posts: 16,173
Likes: 4,781
From: Burbank, WA
If you were to compare real DOT power brake hose to typical 3/8 fuel hose, you'd see a huge difference in construction and wall stiffness. Brake safety is not worth messing with, imho. "Common practice" doesn't make it right.
Logistics Pro
Joined: Nov 2011
Posts: 4,685
Likes: 80
From: Northville, MI
I have inspected thousands of vehicles over the years and never seen one collapsed. That said Wayne, you may be right on the difference between fuel line and brake booster hose.
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