No brakes before starting
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Fleet Mechanic
Joined: Jul 2002
Posts: 1,297
Likes: 34
From: S/W Virginia
No brakes before starting
Recently my 06 F150 has started to have no brakes before starting the engine. By no brakes, I mean that the booster is very stiff, like there's no residual pressure. Truck is a manual transmission so if my parking brake isn't set very tight it will start to roll forward until the engine starts. Seems to do fine after starting it. As soon as engine fires I have the booster back. Does this mean the booster is going bad? Check valve?
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Fleet Mechanic
Joined: Jul 2002
Posts: 1,297
Likes: 34
From: S/W Virginia
I went to Napa yesterday to see if they had a check valve and they didn't list one. Is that something that can be changed separate on this truck or is it made into the booster?
Fleet Owner
Joined: Apr 2008
Posts: 24,319
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From: 0,0,1
It's a dealer item, assuming it's still available.
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Fleet Mechanic
Joined: Jul 2002
Posts: 1,297
Likes: 34
From: S/W Virginia
Dealer doesn't list one. Don't have a junkyard close to try.
Does anyone know if a generic checkvalve like this would work?
https://shop.advanceautoparts.com/p/...189/22143797-p
Does anyone know if a generic checkvalve like this would work?
https://shop.advanceautoparts.com/p/...189/22143797-p
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Super Moderator
Joined: Apr 2004
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Try it. You might have a leak elsewhere, so some "experimenting" with vacuum retention may be in order.
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Thread Starter
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Fleet Mechanic
Joined: Jul 2002
Posts: 1,297
Likes: 34
From: S/W Virginia
If I'm parked on a hill and the parking brake isn't set quite as tight as it should be, the truck will start rolling when the clutch is pressed.
Lead Driver
Joined: Nov 2020
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From: Sportsman's Paradise
That's normal, set the parking brake tighter.
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Fleet Mechanic
Joined: Jul 2002
Posts: 1,297
Likes: 34
From: S/W Virginia
Yeah, I've been making sure it's set especially tight now, but for the past 14 years it hasn't done that, so I'm assuming something is going wrong. My f250 can sit for months and not do it
I'll try a universal check valve and see what happens
I'll try a universal check valve and see what happens
Fleet Owner
Joined: Apr 2008
Posts: 24,319
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From: 0,0,1
Because if it's not holding vacuum, then it is potentially a vacuum leak which in turn will effect the correct operation of the engine. Not to mention that if the leak is due to a rupture in the booster diaphragm the problem will get worse over time.
Hotshot
Joined: Feb 2004
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From: The Shenandoah Valley