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#11
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Old enough to know better but young enough not to listen |
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#12
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Quote:
My thought is that somehow the booster is allowing fluid backwards. I'm guessing a check valve is stuck open. There are some good rebuild DIY out there Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#13
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Quote:
OP find out where the pressure fluid is going. Is the fluid level decreasing after several pumps to the floor?
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Digital Competition Systems The older I get... The faster I was... No Fear |
#14
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Fluid level remains consistent. As I think I mentioned petal remains firm with X5 running booster vacuum unplugged. Reconnect booster vacuum pedal disappears. Thinking I may have to swap it out.
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Old enough to know better but young enough not to listen |
#15
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I would guess the seals in the master are leaking internally. As Andrew pointed out it seems the fluid is allowed to flow backwards. Did you put the same size master cylinder on it when you replaced it?
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Digital Competition Systems The older I get... The faster I was... No Fear |
#16
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Yes. Ordered it by part number. Been through two of them.... I would’ve assumed if the seals in the master were bypassing technically it should not matter if the vehicle is running or not. Super firm pedal I can stand on it and the brake pedal remains firm. Vehicle off of course. It’s very perplexing not to mention super frustrating... I have bled many vehicles in the past only time I ever had a problem was with clutch slave cylinder in a 944 turbo. Second Was a 79 Volkswagen rabbit with a faulty rear proportioning valve. I have a pressure bleeder and from what I can figure decent software to activate the DSC. I use an Atel 908
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Old enough to know better but young enough not to listen |
#17
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Quote:
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Digital Competition Systems The older I get... The faster I was... No Fear |
#18
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Yes I believe I have the air out.
__________________
Old enough to know better but young enough not to listen |
#19
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Question
Can you get a hard stable pedal with the engine off? If yes and the pedal drop only happens with the engine running, then look up stream from the master and booster, vac line, etc I can not tell what your year, make, model is as there is nothing in your signature line On the 4.8is application there is a right side cam driven vacuume pump, when it is dry for an extended period of time it fails See realoem for exploded visuals On theses cars, a bad booster, vac leaks will give you a soft pedal engine on!
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2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green Last edited by StephenVA; 11-21-2019 at 10:05 PM. |
#20
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+1
On the vacuum pump (458€) but since I just finished this job last night... Check closely and see if you hear a noise like gurgling/boiling behind the steering wheel then your pump (4.8iS) is shot and most likely the booster although I am not sure which failed 1st. Sent from my SM-A730F using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
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