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brake booster

Discussion in 'Technical Q&A' started by gau-8, Aug 21, 2012.

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  1. gau-8

    gau-8 Rookie

    Aug 21, 2012
    21
    #1 gau-8, Aug 21, 2012
    hard brakes. Replaced the brake booster valve. Still doesnt fix the problem. The brakes work fine for a couple of tries then go hard again. Brake booster pump seems to be working fine. put a vacume on it and it holds pressure no problem. Checked the vacume pressure off the engine and im only getting around 10 inch pounds at idle. This seems much lower then a regular car that puts out around 18 or so. Any expertise in this area would be greatly apprieciated. Thanks, Mike
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #2 Steve Magnusson, Aug 21, 2012
    Last edited: Aug 21, 2012
    What year/model/version F?

    Are you applying the vacuum just to the physical port on the brake booster or to where the check valve mounts (which will also include the hose from the check valve to the brake booster)?
     
  3. gau-8

    gau-8 Rookie

    Aug 21, 2012
    21
    #3 gau-8, Aug 22, 2012
    Its an 82 308 Steve. The car is at my old mans shop in socal. They build hot rods so their not to up to speed on Ferraris. Im having to relay info back and forth. So not quite sure if i can answer your question since im not actually performing the troubleshooting
     
  4. gau-8

    gau-8 Rookie

    Aug 21, 2012
    21
    #4 gau-8, Aug 22, 2012
    Im in Oregon and the car is in socal
     
  5. don_xvi

    don_xvi F1 Rookie

    Nov 1, 2003
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    Outside Detroit
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    Don the 16th
    #5 don_xvi, Aug 22, 2012
    See where Steve's going there? Saying to test by applying the vacuum back there in the engine compartment to test if there's a leak in the long vacuum line to the front of the car.

    But are you saying you're only getting 10 inHg of vacuum?
     
  6. gau-8

    gau-8 Rookie

    Aug 21, 2012
    21
    #6 gau-8, Aug 22, 2012
    Yes only 10 inch lbs off the motor. Doesn't seem like enough.
    We can't seem to find any leaks and have replaced the booster valve
     
  7. Drew Altemara

    Drew Altemara Formula 3

    Feb 11, 2002
    1,537
    Tuscaloosa, AL
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    Drew Altemara
    #7 Drew Altemara, Aug 22, 2012
    It may be that one of the rubber break lines to the caliber has closed up. They tend to do that with age.

    Drew
     
  8. gau-8

    gau-8 Rookie

    Aug 21, 2012
    21
    #8 gau-8, Aug 22, 2012
    Ok we'll check that out
     
  9. gau-8

    gau-8 Rookie

    Aug 21, 2012
    21
    #9 gau-8, Aug 22, 2012
    We checked those lines. Doesn't seem to be the problem. The question I have is shouldn't the engine be producing more then 10inches of vacume at idle? The car runs but I don't think like a Ferrari should. At 10 inches that would mean around 6 or so once you head down the road. Not enough to keep up with the booster. Do you think it could be a cam adjustment issue?
     

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