Vaccum Pump Pressure?
Elder User
Joined: Dec 2004
Posts: 891
Likes: 1
From: Toulon,Il.
actually vaccum - suction should be about14-17inches of vaccum, i use that spec only cuz most cars operate there vaccum acc. at that level. Maybe working good at as little as 10inches.Haven't really ever measured it,are you having trouble with something not working?
Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
id take my brakes being soft all day compared to having to pull the brake pedal back up with my foot like i do. any one know how to fix that?
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Elder User
Joined: Nov 2004
Posts: 829
Likes: 0
From: Syracuse, NY
dirty, when you didnt have power brakes, did heat selecter work? did it actually blow out the vents other than defrost?
i pretty much have no power breaks, and its somethin iv been putting off that i need to get fixed
i pretty much have no power breaks, and its somethin iv been putting off that i need to get fixed
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Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
happend in the summer... didnt check the heater i just started at the pump and that was around 5 when i heard it was suposed to be around 20. i think if you just start checking every vacuum line you may find a leak of some sort. but also if the check valve on the booster isnt doing its job right then that would also cause problems i would think.
Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
this is a vacuum test out of chilton pro repair manual:
Vacuum Leak Test
Vacuum Leak Test
- Operate the engine at idle without touching the brake pedal for at least one minute.
- Turn off the engine and wait one minute.
- Test for the presence of assist vacuum by depressing the brake pedal and releasing it several times. If vacuum is present in the system, light application will produce less and less pedal travel. If there is no vacuum, air is leaking into the system.
Senior User
Joined: Jan 2005
Posts: 222
Likes: 0
From: pennsburg Pa
my brakes work there just squishy and pedel goes done pretty far, I bleed them a couple times, I have worst luck with the brake system i put all new lines on new brake cylinders brake booster and master cylinder all at once last year, and still have problems,
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Fading brakes usually means the pads or rotors are glazed (heat)
A soft pedal can be a bad master cylinder, air in the lines or a leak.