VW anti lock braking

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VW anti lock braking
Bob 12 April 2005 00:43:28
	99 VW passat with anti lock brakes. The ABS light is lit in the dash signifying (according to the manual) that the ABS system isn't working. Should the normal braking system still work properly? Can the ABS be "bypassed" so that the light goes out, and the ABS system no longer functional w/out other repercussions? Thanks in advance. Bob
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Jan Kalin 12 April 2005 14:44:43 [ permanent link ]
	In article <QjB6e.38758$Pc.31910@tornado.tampabay.rr.com>, bob wrote:>99 VW passat with anti lock brakes. The ABS light is lit in the dash >signifying (according to the manual) that the ABS system isn't working. >Should the normal braking system still work properly? Can the ABS be >"bypassed" so that the light goes out, and the ABS system no longer >functional w/out other repercussions?> Thanks in advance.> Bob Yes, of course it's still functional, as if ABS were not installed. Think about it. No regulation authority would permit and no manufacturer would risk manufacturing a vehicle whose complete brake system would fail if a fuse or a sensor for ABS electronics died. I'd guess that one of the wheel sensors is dead. ABS needs accurate speed data from each wheel to determine which one is locking. This is achieved with a toothed wheel and a magnetic sensor that provides pulses as the wheel rotates. The ABS electronics compares rotation rates of all four wheels and drops the pressure in the caliper of the wheel that's slowing down more than the other three. As the Hitch-Hiker's Guide to the Galaxy says: Don't Panic! Have the system checked out by a shop and in the meanwhile just drive a bit more carefully, keeping in mind that if you brake agressively you might lock up wheels. Cheers! -- /"\ Jan Kalin (male, preferred languages: Slovene, English) \ / http://charm.zag.si/eng/, email: "name dot surname AT zag dot si" X ASCII ribbon campaign against HTML in mail and postings. / \ I'm a .signature virus. Copy me to help me spread.
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Bob 12 April 2005 23:53:36 [ permanent link ]
	"Jan Kalin" <nobody@noknown.domain> wrote in message news:slrnd5na59.ifc5m.nobody@oxy.zag.si...> In article <QjB6e.38758$Pc.31910@tornado.tampabay.rr.com>, bob wrote:>>99 VW passat with anti lock brakes. The ABS light is lit in the dash>>signifying (according to the manual) that the ABS system isn't working.>>Should the normal braking system still work properly? Can the ABS be>>"bypassed" so that the light goes out, and the ABS system no longer>>functional w/out other repercussions?>> Thanks in advance.>> Yes, of course it's still functional, as if ABS were not installed. Think> about it. No regulation authority would permit and no manufacturer would> risk manufacturing a vehicle whose complete brake system would fail if a> fuse or a sensor for ABS electronics died.> I'd guess that one of the wheel sensors is dead. ABS needs accurate speed> data from each wheel to determine which one is locking. This is achieved> with a toothed wheel and a magnetic sensor that provides pulses as the> wheel rotates. The ABS electronics compares rotation rates of all four> wheels and drops the pressure in the caliper of the wheel that's slowing> down more than the other three.> As the Hitch-Hiker's Guide to the Galaxy says: Don't Panic! Have the> system checked out by a shop and in the meanwhile just drive a bit more> carefully, keeping in mind that if you brake agressively you might lock up> wheels. thank you for the reply..any idea if that is a relatively expensive or inexpensive repair at VW shop (assuming it is one of the wheel sensors)? also, i never recall seeing a wheel sensor or any other magnetic pickup device in the wheel area with wheels off, can you describe wherabouts the sensors are located? bob
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Jan Kalin 13 April 2005 13:25:05 [ permanent link ]
	In article <4HV6e.60446$Fz.27617@tornado.tampabay.rr.com>, bob wrote:> "Jan Kalin" <nobody@noknown.domain> wrote in message >news:slrnd5na59.ifc5m.nobody@oxy.zag.si...>> In article <QjB6e.38758$Pc.31910@tornado.tampabay.rr.com>, bob wrote:>>>99 VW passat with anti lock brakes. The ABS light is lit in the dash>>>signifying (according to the manual) that the ABS system isn't working.>>>Should the normal braking system still work properly? Can the ABS be>>>"bypassed" so that the light goes out, and the ABS system no longer>>>functional w/out other repercussions?>>> Thanks in advance.>>> Yes, of course it's still functional, as if ABS were not installed. Think>> about it. No regulation authority would permit and no manufacturer would>> risk manufacturing a vehicle whose complete brake system would fail if a>> fuse or a sensor for ABS electronics died.>> I'd guess that one of the wheel sensors is dead. ABS needs accurate speed>> data from each wheel to determine which one is locking. This is achieved>> with a toothed wheel and a magnetic sensor that provides pulses as the>> wheel rotates. The ABS electronics compares rotation rates of all four>> wheels and drops the pressure in the caliper of the wheel that's slowing>> down more than the other three.>> As the Hitch-Hiker's Guide to the Galaxy says: Don't Panic! Have the>> system checked out by a shop and in the meanwhile just drive a bit more>> carefully, keeping in mind that if you brake agressively you might lock up>> wheels.> thank you for the reply..any idea if that is a relatively expensive or >inexpensive repair at VW shop (assuming it is one of the wheel sensors)? The part probably costs around $100 and I'd guess that 15 minutes to change it is plenty of time, but I'm just guessing. also, i never recall seeing a wheel sensor or any other magnetic pickup >device in the wheel area with wheels off, can you describe wherabouts the >sensors are located? I know next to nothing about VWs but I'd say it's somewhere behind the disc. Apart from the hydraulic line that leads to the calipers you probably have two cables, one leading to brakepad wear sensor located on the brakepads and the other leading to the ABS sensor. Check out http://bmwe32.student.utwente.nl/johan/front_shocks/front_shocks.html and you'll see what I'm talking about (even though the page is about a BMW). -- /"\ Jan Kalin (male, preferred languages: Slovene, English) \ / http://charm.zag.si/eng/, email: "name dot surname AT zag dot si" X ASCII ribbon campaign against HTML in mail and postings. / \ I'm a .signature virus. Copy me to help me spread.
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Bob 14 April 2005 18:32:49 [ permanent link ]
	Jan, thanks for the information. Just got back from the dealer. Let me give you the whole history and give me your opinion: 1. passat was at dealership last wk because daytime running lights didn't work and a/c evaporator was leaking. 2. the entire dash was removed to get to evaporator and replace a bad relay for the running lights. 3. car was at dealership for 3 days getting this work done. 4. ABS malfunction dash light came on for 1st time in car's history that day on way home from dealership. 5. dealership today tells me that the ABS system needs new "conrol module", $1,400 USD. IMO, probably something got screwed up or not connected properly when dash was apart.. What's your opinion? bob "Jan Kalin" <nobody@noknown.domain> wrote in message news:slrnd5pps8.h85gb.nobody@oxy.zag.si...> In article <4HV6e.60446$Fz.27617@tornado.tampabay.rr.com>, bob wrote:>> "Jan Kalin" <nobody@noknown.domain> wrote in message>>news:slrnd5na59.ifc5m.nobody@oxy.zag.si...>>> In article <QjB6e.38758$Pc.31910@tornado.tampabay.rr.com>, bob wrote:>>>>99 VW passat with anti lock brakes. The ABS light is lit in the dash>>>>signifying (according to the manual) that the ABS system isn't working.>>>>Should the normal braking system still work properly? Can the ABS be>>>>"bypassed" so that the light goes out, and the ABS system no longer>>>>functional w/out other repercussions?>>>> Thanks in advance.>>>> Yes, of course it's still functional, as if ABS were not installed. >>> Think>>> about it. No regulation authority would permit and no manufacturer would>>> risk manufacturing a vehicle whose complete brake system would fail if a>>> fuse or a sensor for ABS electronics died.>>> I'd guess that one of the wheel sensors is dead. ABS needs accurate >>> speed>>> data from each wheel to determine which one is locking. This is achieved>>> with a toothed wheel and a magnetic sensor that provides pulses as the>>> wheel rotates. The ABS electronics compares rotation rates of all four>>> wheels and drops the pressure in the caliper of the wheel that's slowing>>> down more than the other three.>>> As the Hitch-Hiker's Guide to the Galaxy says: Don't Panic! Have the>>> system checked out by a shop and in the meanwhile just drive a bit more>>> carefully, keeping in mind that if you brake agressively you might lock >>> up>>> wheels.>> thank you for the reply..any idea if that is a relatively expensive or>>inexpensive repair at VW shop (assuming it is one of the wheel sensors)?> The part probably costs around $100 and I'd guess that 15 minutes to> change it is plenty of time, but I'm just guessing.> also, i never recall seeing a wheel sensor or any other magnetic pickup>>device in the wheel area with wheels off, can you describe wherabouts the>>sensors are located?> I know next to nothing about VWs but I'd say it's somewhere behind the> disc. Apart from the hydraulic line that leads to the calipers you> probably have two cables, one leading to brakepad wear sensor located on> the brakepads and the other leading to the ABS sensor. Check out> http://bmwe32.student.utwente.nl/johan/front_shocks/front_shocks.html and> you'll see what I'm talking about (even though the page is about a BMW).> -- > /"\ Jan Kalin (male, preferred languages: Slovene, English)> \ / http://charm.zag.si/eng/, email: "name dot surname AT zag dot si"> X ASCII ribbon campaign against HTML in mail and postings.> / \ I'm a .signature virus. Copy me to help me spread.
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Jan Kalin 15 April 2005 15:06:27 [ permanent link ]
	In article <lav7e.353$_t3.187@tornado.tampabay.rr.com>, bob wrote:>Jan, thanks for the information. Just got back from the dealer. Let me >give you the whole history and give me your opinion:> 1. passat was at dealership last wk because daytime running lights didn't >work and a/c evaporator was leaking.>2. the entire dash was removed to get to evaporator and replace a bad relay >for the running lights.>3. car was at dealership for 3 days getting this work done.>4. ABS malfunction dash light came on for 1st time in car's history that day >on way home from dealership.>5. dealership today tells me that the ABS system needs new "conrol module", >$1,400 USD.> IMO, probably something got screwed up or not connected properly when dash >was apart.. What's your opinion? Hmm, I think the control unit is under the hood, so IMHO the two aren't related. But if you look on Google, you'll see that quite a few people are complaining about failing units, so it might be a common problem. Check out http://tech.bentleypublishers.com/thread.jspa?messageID=143749 and http://www.nonosi.org/a6absfailure/ Not the same error as yours, but there are some cheaper options listed. Cheers! "Jan Kalin" <nobody@noknown.domain> wrote in message >news:slrnd5pps8.h85gb.nobody@oxy.zag.si...>> In article <4HV6e.60446$Fz.27617@tornado.tampabay.rr.com>, bob wrote:>>> "Jan Kalin" <nobody@noknown.domain> wrote in message>>>news:slrnd5na59.ifc5m.nobody@oxy.zag.si...>>>> In article <QjB6e.38758$Pc.31910@tornado.tampabay.rr.com>, bob wrote:>>>>>99 VW passat with anti lock brakes. The ABS light is lit in the dash>>>>>signifying (according to the manual) that the ABS system isn't working.>>>>>Should the normal braking system still work properly? Can the ABS be>>>>>"bypassed" so that the light goes out, and the ABS system no longer>>>>>functional w/out other repercussions?>>>>> Thanks in advance.>>>>> Yes, of course it's still functional, as if ABS were not installed. >>>> Think>>>> about it. No regulation authority would permit and no manufacturer would>>>> risk manufacturing a vehicle whose complete brake system would fail if a>>>> fuse or a sensor for ABS electronics died.>>>> I'd guess that one of the wheel sensors is dead. ABS needs accurate >>>> speed>>>> data from each wheel to determine which one is locking. This is achieved>>>> with a toothed wheel and a magnetic sensor that provides pulses as the>>>> wheel rotates. The ABS electronics compares rotation rates of all four>>>> wheels and drops the pressure in the caliper of the wheel that's slowing>>>> down more than the other three.>>>> As the Hitch-Hiker's Guide to the Galaxy says: Don't Panic! Have the>>>> system checked out by a shop and in the meanwhile just drive a bit more>>>> carefully, keeping in mind that if you brake agressively you might lock >>>> up>>>> wheels.>>> thank you for the reply..any idea if that is a relatively expensive or>>>inexpensive repair at VW shop (assuming it is one of the wheel sensors)?>> The part probably costs around $100 and I'd guess that 15 minutes to>> change it is plenty of time, but I'm just guessing.>> also, i never recall seeing a wheel sensor or any other magnetic pickup>>>device in the wheel area with wheels off, can you describe wherabouts the>>>sensors are located?>> I know next to nothing about VWs but I'd say it's somewhere behind the>> disc. Apart from the hydraulic line that leads to the calipers you>> probably have two cables, one leading to brakepad wear sensor located on>> the brakepads and the other leading to the ABS sensor. Check out>> http://bmwe32.student.utwente.nl/johan/front_shocks/front_shocks.html and>> you'll see what I'm talking about (even though the page is about a BMW). -- /"\ Jan Kalin (male, preferred languages: Slovene, English) \ / http://charm.zag.si/eng/, email: "name dot surname AT zag dot si" X ASCII ribbon campaign against HTML in mail and postings. / \ I'm a .signature virus. Copy me to help me spread.
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VW anti lock braking

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