Marcus3 4 Posted August 30, 2007 Report Share Posted August 30, 2007 Hi folks I have a question, where does the vacuum line to the brake booster connect to the engine ? on the way home from work tonight I almost rear ended the car in front of me when I had a complete loss of brake vacuum, the car also idles all over the place and no boost at all, i think the hose to the brake vacuum assist unit has come off or has split , at the engine and before I look I went through the V8 manual and I could not find where this hose connects to the engine, can someone please help me by letting me know where this hose goes ? I have a 1997 V8 thanks Marcus California, USA Quote Link to post Share on other sites
Marcus3 4 Posted August 30, 2007 Author Report Share Posted August 30, 2007 ahhh no worries, I found it and that's not the problem, brake booster is ok too, so i am guessing something under the intake manifold has come loose :/ -Marcus Quote Link to post Share on other sites
Paula&Marcus 0 Posted August 30, 2007 Report Share Posted August 30, 2007 Hi Marcus3, Please have a look at the sticker inside of your rear hatch. There you will see that the vacuum for the brake servo comes directly of the plenum (black 1/2" hose). BTW, just next to it there is another smaller vacuum pipe that goes into a reservoir which is used for the climate control flaps. If you (almost) completely lost your brake servo assistance and your engine is idling way too high then you should investigate: - is the black vacuum hose properly attached (both ends) - is the black hose fine (no holes, cuts, splits ...) - maybe the diaphragma inside the brake servo itself is leaking - or you have some other severe parasitic air supply (=leak) somewhere between the throttle butterflies and cylinder head Cheers Marcus www.PUKesprit.de Hi folks I have a question, where does the vacuum line to the brake booster connect to the engine ? on the way home from work tonight I almost rear ended the car in front of me when I had a complete loss of brake vacuum, the car also idles all over the place and no boost at all, i think the hose to the brake vacuum assist unit has come off or has split , at the engine and before I look I went through the V8 manual and I could not find where this hose connects to the engine, can someone please help me by letting me know where this hose goes ? I have a 1997 V8 thanks Marcus California, USA Quote Marcus Link to post Share on other sites
Marcus3 4 Posted August 31, 2007 Author Report Share Posted August 31, 2007 I think my problem is the Idle valve (blue) hose from the throttle body side has popped off so I am going to remove the intake plenum (again) :/ this weekend I checked the vacuum hoses and tested the brake booster with a vacuum pump and it's fine the one thing I would ask (because I cant find it in my service manual right now) is , what are the torque specs for the bolts when I bolt the intake plenum back on thanks, -Marcus Quote Link to post Share on other sites
joeyoesprit 1 Posted August 31, 2007 Report Share Posted August 31, 2007 (edited) I think my problem is the Idle valve (blue) hose from the throttle body side has popped off so I am going to remove the intake plenum (again) :/ this weekend I checked the vacuum hoses and tested the brake booster with a vacuum pump and it's fine the one thing I would ask (because I cant find it in my service manual right now) is , what are the torque specs for the bolts when I bolt the intake plenum back on thanks, -Marcus From Lotus service notes Section ED page 18 "Using new gaskets (dry) if necessary, fit the plenum onto the housings and tighten the plenum fixing bolts to 20 Nm (15 Ibf.ft)." JoeyO 2001 V8 Edited August 31, 2007 by joeyoesprit Quote JoeyO 2001 V8 - Silver 2007 Ducati 1098 Link to post Share on other sites
Marcus3 4 Posted August 31, 2007 Author Report Share Posted August 31, 2007 From Lotus service notes Section ED page 18 "Using new gaskets (dry) if necessary, fit the plenum onto the housings and tighten the plenum fixing bolts to 20 Nm (15 Ibf.ft)." JoeyO 2001 V8 excellent.... thanks Joey -Marcus Quote Link to post Share on other sites
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