dave107
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| posted on 5/3/09 at 01:27 PM |
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Brake connections
Does anyone know if PTFE tape is ok with brake fluid, i was told by a garage to use it on the brass brake fitting were the brake pipes connect to, now
someones saying it could be an SVA fail or PTFE doesn't like brake fluid.
Comments please. 
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Danozeman
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| posted on 5/3/09 at 01:31 PM |
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You shouldnt need it if the pipes are flared well. I wouldnt use it personally.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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mackei23b
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| posted on 5/3/09 at 01:31 PM |
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You should not use any ptfe tape at all, would be my comment.
[Edited on 5/3/09 by mackei23b]
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Paul TigerB6
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| posted on 5/3/09 at 01:31 PM |
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If the joint is leaking then there is a problem with how the flare on the pipe is seating with the brake pipe union. Any garage that says to fix a
high pressure hydraulic system with PTFE tape should be shot imho!! If tightening it up doesnt work then pop it apart and check for dirt / damage to
the flare for the cause of the leak. You might need to reflare the pipe to get a seal.
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MikeCapon
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| posted on 5/3/09 at 01:32 PM |
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PTFE should not be used on brake fittings. The seal is made by the concave/convex faces on the fittings. The thread's only function is to
tighten the two sealing faces against one another hence there is no need for PTFE or other sealant on the threads.
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Mr Whippy
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| posted on 5/3/09 at 01:34 PM |
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^^^ exactly, don't use it
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russbost
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| posted on 5/3/09 at 01:40 PM |
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NO NO NO NO & NO!!!!!!!
I'll second shooting the garagist who suggested it!
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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dave107
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| posted on 5/3/09 at 01:41 PM |
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Well that's a 100% don't use.
Thanks guys i will take them apart haven't filled yet and remove PTFE.
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Johneturbo
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| posted on 5/3/09 at 03:49 PM |
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Well i was told to use it on my wilwoods, as they seal on the taper.
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mistergrumpy
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| posted on 5/3/09 at 04:03 PM |
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quote:
The seal is made by the concave/convex faces on the fittings
That's not entirely true though as I have Sierra rear calipers which have a concaved recess for the brake pipe to screw onto, however I also
have the standard Sierra rubber brake pipes and they also have a concaved end meaning that you effectively have a sphere of none contact if you get
what I mean.
I remember discussing this in the past on here.
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russbost
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| posted on 5/3/09 at 05:52 PM |
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Mister Grumpy, you have a mismatch of fittings. Most Sierra calipers have a concave seat, the correct hose for this seat has a convex end to mate with
it. Sounds as tho' you have a concave ended hose which is intended for the other type of caliper which has a raised convex section at the bottom
of the drilling. The other possibility is that you have a hose with both convex & concave seats, in which case it may look "wrong" but
is in fact perfectly ok.
Either way providing your joint has sealed it is most unlikely to ever leak whatever the seat inside, it's surprising what you can get away with
as long as it's done up tight!
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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mistergrumpy
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| posted on 5/3/09 at 05:58 PM |
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Yes the joint hasn't leaked, surprisingly as most of the others did. You're right in that the hose I was given has a concave on one end
and a convex on the other but as the convex end is longer then this has been fixed to the chassis with a lock nut. I did have it the other way round
at first because of the mating ends as said but then there was no way of fixing t'other end.
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britishtrident
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| posted on 5/3/09 at 09:30 PM |
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Flair a pipe properly and it will never leak, no brake fitting on a car should use PTFE tape or tapered fittings or fittings with olives. Any seal
should be formed between a deformable part (ie a flaired pipe end or copper washer) and a solid part (ie a master cylinder, a caliper or an other cast
fitting).
[Edited on 5/3/09 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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bigfoot4616
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| posted on 5/3/09 at 11:15 PM |
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what about a brake light switch?
not fitted it yet but mine came from CBS and it says its a tapered thread and to seal with PTFE.(M10)
the UNF one they do is a parallel thread using a copper washer.
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britishtrident
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| posted on 6/3/09 at 07:35 PM |
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Lucas brake like switches were normaly sealed with a copper or aluminum washer.
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