Brakes vs. Vacuum
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Senior User
Joined: Oct 2002
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From: IOWA
Brakes vs. Vacuum
I recently noticed this after a recent job from the local dealership.
My brake pedal slowly goes to the floor and when I release it, the idle of the truck goes up and then settles back down. Do you think there is some sort of vacuum leak around? The truck does have a slightly shaky idle, rich smelling exhaust, and poorer gas mileage after the last job (they replaced a cracked exhaust manifold and an oil pan gasket).
My brake pedal slowly goes to the floor and when I release it, the idle of the truck goes up and then settles back down. Do you think there is some sort of vacuum leak around? The truck does have a slightly shaky idle, rich smelling exhaust, and poorer gas mileage after the last job (they replaced a cracked exhaust manifold and an oil pan gasket).
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Brakes vs. Vacuum
Yes, that sounds like something the dealer should have noticed before any repairs. Since he didn't (or didn't point it out to you), it's now his problem. I'd take it back & make them fix it free.
Posting Guru
Joined: Apr 2002
Posts: 1,471
Likes: 3
From: Greenwood In. USA
Brakes vs. Vacuum
Plug off the line going to the power brake booster and see if it makes a difference. My sister in law had a rustcort (escort)
with a bad booster and it would die when you pushed the brakes.
Hope this helps
with a bad booster and it would die when you pushed the brakes.
Hope this helps
Thread Starter
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Senior User
Joined: Oct 2002
Posts: 260
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From: IOWA
Brakes vs. Vacuum
I disconnected the booster and plugged the line, but no change to the idle (still a little shaky and slight hesitatation on quick throttle). Vacuum at idle stayed between 19" and 20", but went down to 0" on quick throttle instead of around 2".
Also, I applied about 10" of vacuum to the booster and lost about 2" over 10 minutes- not sure if there is a slight hole in the diaphragm, but I guess it is possible.
Also, I applied about 10" of vacuum to the booster and lost about 2" over 10 minutes- not sure if there is a slight hole in the diaphragm, but I guess it is possible.
