Rebuilt Vacuum Booster But pedal Still Hard 84 3.2
12-11-2017, 08:01 PM
#1
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Location: Collierville, TN
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Rebuilt Vacuum Booster But pedal Still Hard 84 3.2
1984 Carrera Targa 3.2. I replaced the vacuum booster with a rebuilt one and new check valve. I did test the check valve before install, but not the booster. I replaced the master cyclinder with a new one. Old booster showed some signs of fluid leakag, so I assumed it was bad. Flushed and bled with the pressure pot from the maste cylinder backward. Old fluid was maybe 4 to 5 years old, which is the flush interval I use in my cars, bikes, etc.
When i start, the pedal does not go down a bit such as on my other cars indicating booster is working. Also, pedal does not feel like it is getting any boost assistance. I hooked an electric ac vacuum pump up to the booster and pulled 30 inches, but still no drop in the pedal. WTF. I really don’t know where to go from here.
Car’s brake pedal is really hard and fictions fine. However, with no vacuum assist it requires a Herculean effort to lock the brakes. Not good since my son and wife occasionally drive her. Any device would be greaty apprecrated.
When i start, the pedal does not go down a bit such as on my other cars indicating booster is working. Also, pedal does not feel like it is getting any boost assistance. I hooked an electric ac vacuum pump up to the booster and pulled 30 inches, but still no drop in the pedal. WTF. I really don’t know where to go from here.
Car’s brake pedal is really hard and fictions fine. However, with no vacuum assist it requires a Herculean effort to lock the brakes. Not good since my son and wife occasionally drive her. Any device would be greaty apprecrated.
12-11-2017, 09:55 PM
#2
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Seems to me there is a rubber line coming off the back of the throttle body that likes to leak. Is your idle unusually high? Just for fun see if the engine still idles with the ICV unplugged. You likely have a vacuum leak somewhere in the booster line. Do you feel vacuum in the line at the booster when removing line from booster?
12-13-2017, 08:37 AM
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Seems to me there is a rubber line coming off the back of the throttle body that likes to leak. Is your idle unusually high? Just for fun see if the engine still idles with the ICV unplugged. You likely have a vacuum leak somewhere in the booster line. Do you feel vacuum in the line at the booster when removing line from booster?
12-13-2017, 09:14 AM
#6
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Vacuum to booster is indeed low from the engine. I have a small leak somewhere that I’ve been trying to track down for months. However, car idles and runs fine. Therefore, I hooked the booster up directly to my portable air condoning evaluator pump which pulls about 30 inches of vacuum. I was hoping that this setup would help troubleshoot the booster. I guess I’ll have to remove the new booster and bench check it. I’m just avoiding this since it is several hours of work including the reinstall and bleeding.
Go find the leak in your line.
