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Registered User
Join Date: May 2008
Location: Nashville, TN
Posts: 419
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apply brakes and idle increases?
I can only guess that something is amiss with my booster. (82SC) Applying the brakes while at idle will increase my idle a few 100 RPM. My brakes are pretty sluggish also. If anyone has a clever test to confirm booster trouble, let me know.
thanks, Ken
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82 911 SC 07 Cayman |
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08-31-2010, 01:58 AM
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Senior Member
Join Date: Nov 2000
Location: Great NorthWest
Posts: 3,941
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That would be my guess - the booster or the hose to the booster is going bad. Search on John Walker's thread about this condition.
A test for this is to pump the pedal several times, then put your foot lightly on the pedal and start the car - the pedal should move away from you as the booster via the vaccum (or lack thereof) kicks in.
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'78 Targa in Minerva Blue |
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08-31-2010, 08:48 AM
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Registered
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you gotta toyota not a porsche!
sorry, i couldn't resist...
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1984 911 Carrera Coupe - 32C #73 - M64/05 1998 E36 M3 4dr 2006 Sienna 5dr - the hauler 2004 Lexus GX470 2010 Cannondale Caffeine II - Lefty |
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08-31-2010, 12:13 PM
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Registered User
Join Date: May 2008
Location: Nashville, TN
Posts: 419
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does anyone know how far the pedal should go down when the car starts? Mine goes down VERY little.
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82 911 SC 07 Cayman |
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08-31-2010, 12:47 PM
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Senior Advisor
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Yeah, it won't go down like a US car. You will have really crappy brakes if the booster is not working, real bad! So I'm thinking that they do work but there might be a vacuum leak in the engine (one problem) the brakes might need to be rebuilt/overhauled (second problem) The booster might be leaking (third problem) or a combination of all three. Start with the booster by removing the vacuum hose with the engine running and check for vacuum and that the engine surges a bit. A vacuum gage can be placed in this line and check that it holds vacuum after the engine is shut off.
Check the condition of the pads and calipers, bleed the brakes, replace the pads, overhaul the calipers, re-bleed the brakes. Then check the engine for small vacuum leaks. Start with that.
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08 Cayenne Turbo |
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08-31-2010, 06:17 PM
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