AmbisoniK 0 Posted July 1, 2005 I have a problem with the brake peddle pressure changing intermittently while driving. basically under braking the peddle will change from being hard to press to very light. i've checked it on VAG COM,sometimes it shows up other times not but the problem is there pretty much all the time. i'm leaning towards replacing the ABS Pump - £1100 + from VAG !,but i can get a used one with a 2 month guarantee for £100 all in. anyone have any ideas ? Quote Share this post Link to post Share on other sites
Walesy 0 Posted July 1, 2005 hi mate...out of interest....where is it that you can can a pump for £100? Quote Share this post Link to post Share on other sites
StormVR6 0 Posted July 1, 2005 Could well be the ABS control unit thats buggered, cheaper than the pump and easier to fit. The pump is a pain to change and obviously buying a second hand one has it's problems especially if you pay a mechanic to fit it! Also make sure that the system has been properly bled, as this can cause pump errors. Quote Share this post Link to post Share on other sites
StormVR6 0 Posted July 1, 2005 Although this sounds mad, AFAIK you can purge the pump by driving at at steady speed (20mph) and flooring the brakes and then do the same in reverse. This can dissipate any air locks in the pump which can also cause errors. Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 hi mate...out of interest....where is it that you can can a pump for £100? That would be telling seeing as they only got one used one left :wink: Quote Share this post Link to post Share on other sites
Walesy 0 Posted July 1, 2005 :) ...fairy snuff..... :ignore: Quote Share this post Link to post Share on other sites
StormVR6 0 Posted July 1, 2005 hi mate...out of interest....where is it that you can can a pump for £100? Various breakers will sell you pump for around the £100 mark, but as I said a guarantee is all very well but if you pay a mechanic £200+ to fit it and it is buggered you won't be best pleased! Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 Could well be the ABS control unit thats buggered, cheaper than the pump and easier to fit. The pump is a pain to change and obviously buying a second hand one has it's problems especially if you pay a mechanic to fit it! Also make sure that the system has been properly bled, as this can cause pump errors. Yeah good point - i'll have to make sure it's been bled too....something to think about there... Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 Although this sounds mad, AFAIK you can purge the pump by driving at at steady speed (20mph) and flooring the brakes and then do the same in reverse. This can dissipate any air locks in the pump which can also cause errors. Something else to give a go although i think i've already done the first part several times,have to try reverse :wink: Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 :) ...fairy snuff..... :ignore: Dinkus has one for sale for £75...check this link - http://the-corrado.net/.archive/forum/viewtopic.php?p=283643 also try Volks-Apart & City breakers Quote Share this post Link to post Share on other sites
Walesy 0 Posted July 1, 2005 :oops: ...sorry mate...the inquirey was really just out of interest for future reference...ive been asked a couple of times where they can be bought....im not looking for one at the momment....but thanks for looking!. besides.....would you honestly want to buy a car part from a guy who has walls in house painted that colour?.... Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 :oops: ...sorry mate...the inquirey was really just out of interest for future reference...ive been asked a couple of times where they can be bought....im not looking for one at the momment....but thanks for looking!. besides.....would you honestly want to buy a car part from a guy who has walls in house painted that colour?.... Lol good point Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 hi mate...out of interest....where is it that you can can a pump for £100? Various breakers will sell you pump for around the £100 mark, but as I said a guarantee is all very well but if you pay a mechanic £200+ to fit it and it is buggered you won't be best pleased! I think i'll get my VAG mechanic to have a look before i buy anything,a mate of mine who's more of a peugeot specialist diagnosed the problem in the first place - thanks for the info dude Quote Share this post Link to post Share on other sites
dr_mat 0 Posted July 1, 2005 ABS Left Rear Outlet Valve *often* means you have a failed valve block on the ABS unit. I think it tests the left rear valve first during ignition-on tests, so that's the one that shows up first. Certainly it did for me. The upside is that apart from the 2-3 hours labour for fitting, they're on the whole quite reliable, so if you buy a 2nd hand one, warranty or otherwise, chances are it will be ok. My replacement pump unit cost me £20, and most of that was postage .. :) (Of course, now that I've said that, it'll break ... :( ) Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 ABS Left Rear Outlet Valve *often* means you have a failed valve block on the ABS unit. I think it tests the left rear valve first during ignition-on tests, so that's the one that shows up first. Certainly it did for me. The upside is that apart from the 2-3 hours labour for fitting, they're on the whole quite reliable, so if you buy a 2nd hand one, warranty or otherwise, chances are it will be ok. My replacement pump unit cost me £20, and most of that was postage .. :) (Of course, now that I've said that, it'll break ... :( ) Arrgh now i don't know what to do - i could take a chance & just buy the dam thing (& get it fitted a lot cheaper by my mate,who's a very good mechanic - prepares rally cars),or take it to my VAG mechanic although not through VW is still expensive (it's catching) but shit hot with all things VAG & would certainly get to the bottom of things,but would cost a lot more if it turns out to be the pump - flip a coin time :brickwall: Quote Share this post Link to post Share on other sites
dr_mat 0 Posted July 1, 2005 Well - if you are getting occasional "abs light on from ignition on" and the ECU is reporting "left rear outlet valve" then you almost certainly need a new ABS block. I wouldn't even consider buying one from the dealers though, when 2nd hand ones are plentiful, cheap and on the whole quite reliable. Think of it this way. How many mistakes can you afford to make with dodgy 2nd hand ones and STILL have it massively cheaper than a new one? Lots... Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 Well - if you are getting occasional "abs light on from ignition on" and the ECU is reporting "left rear outlet valve" then you almost certainly need a new ABS block. I wouldn't even consider buying one from the dealers though, when 2nd hand ones are plentiful, cheap and on the whole quite reliable. Think of it this way. How many mistakes can you afford to make with dodgy 2nd hand ones and STILL have it massively cheaper than a new one? Lots... That's the problem,the ABS light isn't coming on @ all - totally agree there's no way i'd buy new...you'd have to be nuts..over 10 times cheaper to buy second hand ! Quote Share this post Link to post Share on other sites
dr_mat 0 Posted July 1, 2005 You're getting ABS fault codes and you never get the ABS light on? Does it come on during the power-on-self-test cycle when you turn the ignition on? Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 "You're getting ABS fault codes and you never get the ABS light on?" Yes "Does it come on during the power-on-self-test cycle when you turn the ignition on?" No You think the previous owner disabled the ABS light after finding out the cost of an ABS Pump ? :roll: Quote Share this post Link to post Share on other sites
dr_mat 0 Posted July 1, 2005 Err... YUP! (Oh, and not only does that land you with a big bill, but you are probably also in posession of a non-legal MOT certificate, cos the car definitely shouldn't have passed if the light wasn't working when it was tested! :( ) Quote Share this post Link to post Share on other sites
AmbisoniK 0 Posted July 1, 2005 Err... YUP! (Oh, and not only does that land you with a big bill, but you are probably also in posession of a non-legal MOT certificate, cos the car definitely shouldn't have passed if the light wasn't working when it was tested! :( ) MOT thing ain't a problem,but the big bill bit i'm not too happy about - what's involved dude ? Quote Share this post Link to post Share on other sites
dr_mat 0 Posted July 1, 2005 Well you've seen yourself what they cost to buy. When mine was replaced I did ok - 2.5 hours labour and the part cost very little because it came from a breakers. No warranty though, so I was screwed if it had been dead, too, but so far, touching anything made of wood .. Quote Share this post Link to post Share on other sites