Replacing brake fluid

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CarGuru > BMW > Replacing brake fluid 19 April 2006 22:37:47

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Replacing brake fluid
MW de Jager 4 May 2005 13:47:40
	Someone once told me that it was a good idea to replace your brake fluid regularly, because of its hygroscopic nature and that the water build up will corode the brake system. When I replaced the wheel cylinders on and old Beetle, the recon ones I fitted were resleeved with stainless steel, which should not have this problem. Is this necessary with the E36 BMWs, brake and clutch, and how often do I need to have it done.
		Add comment


Zerouali 4 May 2005 15:06:09 [ permanent link ]
	Not just because it corrodes the system, but as the water content increases your brake fluid will (obviously) dilute, meaning that if you had to do some heavy braking, there is a chance your fluid will boil and you'll lose all braking capability. By all means do the stainless steel thing if you can, but you still need to replace the fluid regularly to keep yourself in one piece! "MW de Jager" <mwdejager@privatemail.me.uk> wrote in message news:d5a5st$qku$1@ctb-nnrp2.saix.net...> Someone once told me that it was a good idea to replace your brake fluid > regularly, because of its hygroscopic nature and that the water build up > will corode the brake system.> When I replaced the wheel cylinders on and old Beetle, the recon ones I > fitted were resleeved with stainless steel, which should not have this > problem. Is this necessary with the E36 BMWs, brake and clutch, and how > often do I need to have it done.>
		Add comment


Keith 4 May 2005 15:09:25 [ permanent link ]
	"MW de Jager" <mwdejager@privatemail.me.uk> wrote: Someone once told me that it was a good idea to replace your brake fluid >regularly, because of its hygroscopic nature and that the water build up >will corode the brake system.> When I replaced the wheel cylinders on and old Beetle, the recon ones I >fitted were resleeved with stainless steel, which should not have this >problem. Is this necessary with the E36 BMWs, brake and clutch, and how >often do I need to have it done. > wheras the cylinders were stainless, the rest of the hydraulic system may not be... pipes, pistons, springs etc... change the fluid at the recomneded intervals... every 2 years if memory serves. in areas of high humidity, I would do it more often. - less so in dry places. it isnt a huge job and bad brakes kill ppl. keith
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Malt_Hound 4 May 2005 18:16:03 [ permanent link ]
	MW de Jager wrote:> Someone once told me that it was a good idea to replace your brake fluid > regularly, because of its hygroscopic nature and that the water build up > will corode the brake system. Someone was partly right. The brake fluid is hygroscopic (absorbs moisture) and it is a very good idea to change it on a regular basis, but not because it will corrode the innards of the brake system. Even if you filled your brake lines with straight water it would not corrode in there in the absence of oxygen. The reason to replace the fluid is because as the fluid absorbs water it lowers its boiling point. Under heavy braking (coming down out of mountain pass, etc.) the fluid may boil and cause the brakes to fade when you need them most (avoid falling off the big precipice?) When I replaced the wheel cylinders on and old Beetle, the recon ones I > fitted were resleeved with stainless steel, which should not have this > problem. Is this necessary with the E36 BMWs, brake and clutch, and how > often do I need to have it done. General rule of thumb is every 2 years. I suppose it should really vary depending on how much ambient humidity it will be subjected to. Those folks living in Phoenix could probably safely double that interval. YMMV, -Fred W
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MW de Jager 4 May 2005 19:09:51 [ permanent link ]
	I've just spoken to the local stealer, and according to my car's service record it is due for a major service at which stage they replace all fluids anyway. My motor mac will obviously do the service for half the price. Anyone know CASTROL SG/SF specification motor oil. Is this good enough for my 328i? Regards MW "Malt_Hound" <Malt_Hound@spamyahoo.com> wrote in message news:l5WdnXeziegxReXfRVn-iA@adelphia.com...> MW de Jager wrote:>> Someone once told me that it was a good idea to replace your brake fluid >> regularly, because of its hygroscopic nature and that the water build up >> will corode the brake system.> Someone was partly right. The brake fluid is hygroscopic (absorbs > moisture) and it is a very good idea to change it on a regular basis, but > not because it will corrode the innards of the brake system. Even if you > filled your brake lines with straight water it would not corrode in there > in the absence of oxygen.> The reason to replace the fluid is because as the fluid absorbs water it > lowers its boiling point. Under heavy braking (coming down out of > mountain pass, etc.) the fluid may boil and cause the brakes to fade when > you need them most (avoid falling off the big precipice?)> When I replaced the wheel cylinders on and old Beetle, the recon ones I >> fitted were resleeved with stainless steel, which should not have this >> problem. Is this necessary with the E36 BMWs, brake and clutch, and how >> often do I need to have it done.> General rule of thumb is every 2 years. I suppose it should really vary > depending on how much ambient humidity it will be subjected to. Those > folks living in Phoenix could probably safely double that interval.> YMMV,> -Fred W
		Add comment


Uno-Hoo! 18 April 2006 20:22:40 [ permanent link ]
	I'm about to carry out a full two year service on my Rover 75 diesel. The service requires the brake fluid to be replaced. No problem except for the fact that when I am replacing brake fluid (rather than just 'bleeding' the brakes), I never really know how many 'pumps' on the brake pedal to make in order to fully purge the brake pipes of the old fluid. It's not so bad if you are working on an old car and pumping out mucky brown fluid - but on a two year old car the old fluid is usually as clear as the fresh stuff you are putting in. So the question is - how many pumps of the foot brake is necessary to clear all the old fluid out of the pipes to a) the rear brakes and b) the front brakes? Strikes me they ought to sell brake fluid in different colours and then you can be sure that when the fluid being pumped out changes from green to red that you've done the job properly!! Uno-Hoo!
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Doki 18 April 2006 20:34:52 [ permanent link ]
	"Uno-Hoo!" <Uno-Hoo@NOSPAMbigfootdotcom> wrote in message news:tqmdnXb286fQj9jZRVnyjA@pipex.net...> I'm about to carry out a full two year service on my Rover 75 diesel. The > service requires the brake fluid to be replaced. No problem except for the > fact that when I am replacing brake fluid (rather than just 'bleeding' > the brakes), I never really know how many 'pumps' on the brake pedal to > make in order to fully purge the brake pipes of the old fluid. It's not so > bad if you are working on an old car and pumping out mucky brown fluid - > but on a two year old car the old fluid is usually as clear as the fresh > stuff you are putting in. So the question is - how many pumps of the foot > brake is necessary to clear all the old fluid out of the pipes to a) the > rear brakes and b) the front brakes?> Strikes me they ought to sell brake fluid in different colours and then > you can be sure that when the fluid being pumped out changes from green to > red that you've done the job properly!! They do sell brake fluid in different colours. You can get blue stuff from GSF.
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Uno-Hoo! 18 April 2006 20:38:56 [ permanent link ]
	"Doki" <mrdoki@gmail.com> wrote in message news:e234f4$gs6$1@news.freedom2surf.net...> "Uno-Hoo!" <Uno-Hoo@NOSPAMbigfootdotcom> wrote in message > news:tqmdnXb286fQj9jZRVnyjA@pipex.net...>> I'm about to carry out a full two year service on my Rover 75 diesel. The >> service requires the brake fluid to be replaced. No problem except for >> the fact that when I am replacing brake fluid (rather than just >> 'bleeding' the brakes), I never really know how many 'pumps' on the brake >> pedal to make in order to fully purge the brake pipes of the old fluid. >> It's not so bad if you are working on an old car and pumping out mucky >> brown fluid - but on a two year old car the old fluid is usually as clear >> as the fresh stuff you are putting in. So the question is - how many >> pumps of the foot brake is necessary to clear all the old fluid out of >> the pipes to a) the rear brakes and b) the front brakes?>> Strikes me they ought to sell brake fluid in different colours and then >> you can be sure that when the fluid being pumped out changes from green >> to red that you've done the job properly!!> They do sell brake fluid in different colours. You can get blue stuff from > GSF. Interesting - I'll look out for some! Uno-Hoo!
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Reg 18 April 2006 21:15:08 [ permanent link ]
	"Doki" <mrdoki@gmail.com> wrote in message news:e234f4$gs6$1@news.freedom2surf.net...> "Uno-Hoo!" <Uno-Hoo@NOSPAMbigfootdotcom> wrote in message > news:tqmdnXb286fQj9jZRVnyjA@pipex.net...>> I'm about to carry out a full two year service on my Rover 75 diesel. The >> service requires the brake fluid to be replaced. No problem except for >> the fact that when I am replacing brake fluid (rather than just >> 'bleeding' the brakes), I never really know how many 'pumps' on the brake >> pedal to make in order to fully purge the brake pipes of the old fluid. >> It's not so bad if you are working on an old car and pumping out mucky >> brown fluid - but on a two year old car the old fluid is usually as clear >> as the fresh stuff you are putting in. So the question is - how many >> pumps of the foot brake is necessary to clear all the old fluid out of >> the pipes to a) the rear brakes and b) the front brakes?>> Strikes me they ought to sell brake fluid in different colours and then >> you can be sure that when the fluid being pumped out changes from green >> to red that you've done the job properly!!> They do sell brake fluid in different colours. You can get blue stuff from > GSF. the blue stuff i think your find is synthetic fluid used in competition brakes, race cars ect. check what dot rating it has on the reservoir cap or in the hand book, it should be dot 4 or possibly dot 5.
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Doki 18 April 2006 21:20:04 [ permanent link ]
	"reg" <reg@somewhere.fsten.co.uk> wrote in message news:e236pb$1mc$1@emma.aioe.org...> "Doki" <mrdoki@gmail.com> wrote in message > news:e234f4$gs6$1@news.freedom2surf.net...>> "Uno-Hoo!" <Uno-Hoo@NOSPAMbigfootdotcom> wrote in message >> news:tqmdnXb286fQj9jZRVnyjA@pipex.net...>>> I'm about to carry out a full two year service on my Rover 75 diesel. >>> The service requires the brake fluid to be replaced. No problem except >>> for the fact that when I am replacing brake fluid (rather than just >>> 'bleeding' the brakes), I never really know how many 'pumps' on the >>> brake pedal to make in order to fully purge the brake pipes of the old >>> fluid. It's not so bad if you are working on an old car and pumping out >>> mucky brown fluid - but on a two year old car the old fluid is usually >>> as clear as the fresh stuff you are putting in. So the question is - how >>> many pumps of the foot brake is necessary to clear all the old fluid out >>> of the pipes to a) the rear brakes and b) the front brakes?>>> Strikes me they ought to sell brake fluid in different colours and then >>> you can be sure that when the fluid being pumped out changes from green >>> to red that you've done the job properly!!>> They do sell brake fluid in different colours. You can get blue stuff >> from GSF.> the blue stuff i think your find is synthetic fluid used in competition > brakes, race cars ect.> check what dot rating it has on the reservoir cap or in the hand book, it > should be dot 4 or possibly dot 5. This stuff is either DOT 4 or DOT 5.1 as I was considering using it in the Golf. It's fine for road use.
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Iain Miller 18 April 2006 21:28:23 [ permanent link ]
	They do sell brake fluid in different colours. You can get blue stuff >> from>> GSF.> the blue stuff i think your find is synthetic fluid used in competition > brakes, race cars ect.> check what dot rating it has on the reservoir cap or in the hand book, it > should be dot 4 or possibly dot 5. You absolutely don't want Dot 5, that's silicone based fluid & shouldn't be mixed with any other type. Dot 5.1 maybe, but not Dot 5 For normal road use Dot 4 is fine, Dot 5.1 if you want to be picky. I.
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Uno-Hoo! 18 April 2006 22:07:41 [ permanent link ]
	"Nick Dobb" <dobbfamily@ntlworld.com> wrote in message news:qh91g.30258$zf1.405@newsfe5-gui.ntli.net...> "Conor" <conor.turton@gmail.com> wrote in message > news:MPG.1eaf284e1735bcb898c621@news.individual.net...>> In article <tqmdnXb286fQj9jZRVnyjA@pipex.net>, Uno-Hoo! says...>>> Alternatively, there are bleeding kits that you can get which work the>> opposite way round, i.e suck> But doesn't that just turn the original question into "how long do you > have to let it suck for"? Indeed. It would help if I knew what the total capacity of the braking system was. In general, all the 'instructions' for replacing brake fluid simply state: "keep this up until the fluid emerging into the container is clean and clear". The problem, as I stated initially, is that on a two year old car the stuff already in there is 'clean and clear' !! Uno-Hoo!
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Trevor 18 April 2006 23:11:56 [ permanent link ]
	Uno-Hoo! wrote:> "Nick Dobb" <dobbfamily@ntlworld.com> wrote in message > news:qh91g.30258$zf1.405@newsfe5-gui.ntli.net...> "Conor" <conor.turton@gmail.com> wrote in message >>news:MPG.1eaf284e1735bcb898c621@news.individual.net...>> In article <tqmdnXb286fQj9jZRVnyjA@pipex.net>, Uno-Hoo! says...>>> Alternatively, there are bleeding kits that you can get which work the>>>opposite way round, i.e suck>> But doesn't that just turn the original question into "how long do you >>have to let it suck for"?> Indeed. It would help if I knew what the total capacity of the braking > system was. In general, all the 'instructions' for replacing brake fluid > simply state: "keep this up until the fluid emerging into the container is > clean and clear". The problem, as I stated initially, is that on a two year > old car the stuff already in there is 'clean and clear' !!> Uno-Hoo! > I have a Clugston (spelling) ezi-bleed system. You drop the pressure in a tyre to around 10psi and attach a pipe which goes to a reservoir for the brake fluid that gets pressurised, then a pipe with a cap that goes onto the master cylinder. All you do to bleed the brakes normally is open the bleed nipples at each calliper & wait until you get solid fluid with no air. Never tried it but I would have thought that you could open each bleed & let the air force out the fluid to empty the system & then refill with new oil. It cost around a tenner many years ago & has been one of the best tenners ever spent; only draw back is it doesn't fit ever type of master cylinder; however the leaflet that came with it did say others were available.
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Lin Chung 19 April 2006 00:02:19 [ permanent link ]
	Uno-Hoo! wrote:> ...I am replacing brake fluid (rather than just 'bleeding' the brakes)> ...how many pumps of the foot brake is necessary to clear all the old> fluid out of the pipes to a) the rear brakes and b) the front brakes?... There is no distinction between bleeding and replacing brake fluid in the literature I came across. "Bleeding Brakes FAQ and Step-by-Step Instructions" http://www.zeckhausen.com/bleeding_brakes.htm Note instructions No.11 and No.12. After 6 pumps, check the reservoir. Total number of pumps, about 10. Naturally, you can't resist looking up what the other gadgets are available for this, and his comments (link in the article)! -- Lin Chung [Replace "the Water Margin" with "ntlworld" for e-mail].
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Uno-Hoo! 19 April 2006 12:22:51 [ permanent link ]
	"Lin Chung" <lin.chung@the.Water.Margin.com> wrote in message news:fBb1g.25441$ic1.20844@newsfe5-win.ntli.net...> Uno-Hoo! wrote:>> ...I am replacing brake fluid (rather than just 'bleeding' the brakes)>> ...how many pumps of the foot brake is necessary to clear all the old>> fluid out of the pipes to a) the rear brakes and b) the front brakes?...> There is no distinction between bleeding and replacing brake fluid in the> literature I came across.> "Bleeding Brakes FAQ and Step-by-Step Instructions"> http://www.zeckhausen.com/bleeding_brakes.htm> Note instructions No.11 and No.12. After 6 pumps, check the reservoir.> Total number of pumps, about 10.> Naturally, you can't resist looking up what the other gadgets are > available> for this, and his comments (link in the article)! Many thanks for that. Very helpful! Uno-Hoo!
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Lin Chung 19 April 2006 22:37:47 [ permanent link ]
	Trevor wrote:> I have a Clugston (spelling) ezi-bleed system. You drop the pressure in a> tyre to around 10psi and attach a pipe which goes to a reservoir for the> brake fluid that gets pressurised.... It would be this one: Gunson Eezibleed Kit. It's for clutches as well. http://www.gunson.co.uk/item.aspx?item=1818 The PDF has some useful info. Draper also do one but it's very basic (Not confident that it works!): http://www.powertoolsuk.co.uk/webcat/details.asp?ProductCode=37316&id=2534 -- Lin Chung [Replace "the Water Margin" with "ntlworld" for e-mail].
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CarGuru > BMW > Replacing brake fluid 19 April 2006 22:37:47

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Replacing brake fluid

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