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Moko
Silverstone


Joined: 12 May 2019
Posts: 120
Location: London


PostPosted: Tue Jan 07, 2020 5:36 pm    Post subject: How Much Brake Fluid Reply with quote

I’ve been getting the tools together for my first brake fluid change as looking on the service notes it’s been two years since it was last done.

I’ve got a Seeley Power Bleeder together with a flare nut wrench and all I need now is some Brake fluid.....but how much and which type should I buy? Looking it seems Dot 4 either comes in 1L or 5L cans so what size is required for a complete change?

Thanks as always for your advice

David
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7717
Location: Brighton


PostPosted: Tue Jan 07, 2020 8:02 pm    Post subject: Reply with quote

Any Dot 4 fluid is fine .. we use Mobil at work .

You want about 1.5 ltrs .

Start at the n/s/r and take out 0.5 of a litre then o/s/r and 0.25 .. o/s/f and 0.25 and finally n/s/f and 0.25.

If you drain out the brake reservoir first you can do 0.25 per corner but as this is just about impossible due to the strainer then above is how i do it .

0.5 on the n/s/r gets the reservoir drained and the lines cleared .. i've proved it when changing racing blue to standard .. that was the amount i got out before it ran clear .

Bleed nipples .. hard to explain but they do seize .. basically you are fine if just one per caliper comes undone .. don't force them to get them undone .. i use the palm of my hand to hit the spanner .. if it seems too tight then i try the other nipple .. go mad with too much force and it can snap ... i'm afraid this part is experience as to whether it will come loose or not so i can't say much to help.
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maldren
Suzuka


Joined: 07 Oct 2016
Posts: 1231



PostPosted: Tue Jan 07, 2020 8:38 pm    Post subject: Reply with quote

The nipples are fragile and stick, use a T bar on the nipples so you don't apply a bending load, it will help avoid snapping them.

Also, my usual comment, fit stainless nipples to avoid future problems. Lots of threads here.
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Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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skinny_monkey
Nürburgring


Joined: 16 Sep 2014
Posts: 475



PostPosted: Tue Jan 07, 2020 8:52 pm    Post subject: Reply with quote

I normally give mine a little bleed every year, it doesn't need it but mostly to stop the bleed valves from seizing (already had it happen once, don't want to go through that again).
Im overdue actually, good reminder Smile

As above, 2l should be fine
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7472
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Tue Jan 07, 2020 8:58 pm    Post subject: Reply with quote

Assuming they undo, is it worth swapping the nipples for stainless steel ones while you are at it?
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Shalmaneser
Trainee


Joined: 11 Nov 2019
Posts: 50



PostPosted: Tue Jan 07, 2020 9:03 pm    Post subject: Reply with quote

maldren wrote:
The nipples are fragile and stick, use a T bar on the nipples so you don't apply a bending load, it will help avoid snapping them.


That's a good tip, thanks for that.

I always make sure I use a 6 sided deep socket to crack the nipple (sounds painful) then nip it up again so I can use a spanner on it while bleeding.
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Moko
Silverstone


Joined: 12 May 2019
Posts: 120
Location: London


PostPosted: Tue Jan 07, 2020 9:15 pm    Post subject: Reply with quote

Thanks as always guys that’s just the information I needed.
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7717
Location: Brighton


PostPosted: Wed Jan 08, 2020 8:38 pm    Post subject: Reply with quote

I would tend to advise against stainless steel ones .. we used to fit them for a short while but they sheared off worse than standard ones ..

I can't say if it was the type we bought or if there is a problem but i do know stainless steel bolts if not fitted with ally grease won't come undone ..

Exhaust flange studs .. i've done these up then had to remove them .. they don't come undone basically .. new bolts and i had to cut them off .. that's because i didn't use grease .

I'm not keen on using grease on bleed nipples .. hence my thoughts .
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Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2732



PostPosted: Wed Jan 08, 2020 8:48 pm    Post subject: Reply with quote

^^^ Yep as Demort says, I’d stick with genuine Brembo replacements.

I had no end of bother with aftermarket Titanium then Stainless ones. They were done up F/T yet fluid kept weeping from the threads. The profile of the nose was completely different to the genuine ones.

Brake fluid capacity on 996s is 2.7 litres but as long as you get the bulk changed any old stuff will be got next time. After all we should be changing the fluid every 2 years. Thumb
 
  
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Moko
Silverstone


Joined: 12 May 2019
Posts: 120
Location: London


PostPosted: Thu Jan 09, 2020 6:33 am    Post subject: Reply with quote

I ordered two litres from Eurocarparts as they have 35% off Winter Sale at the moment, and it didn’t work for my little order a 50% off Brakes deal as well for anyone interested.

Hopefully my nipples Smile will undo and my bottom won’t fall off !!!
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Guywilko
Trainee


Joined: 04 Jul 2017
Posts: 60



PostPosted: Thu Jan 09, 2020 8:03 am    Post subject: Reply with quote

I heated the nipples up with a kitchen micro blowtorch before removal. Put a decent ring spanner on and gave each a single tap with a light hammer. They all came out.

Used Titanium nipples, no leaks
 
  
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Griffter
Spa-Francorchamps


Joined: 22 May 2016
Posts: 374



PostPosted: Fri Jan 10, 2020 7:40 am    Post subject: Reply with quote

When undoing bleed nipples for the first time, I’ll clean them up with a wire brush and pop a bit of release fluid on them and down the hole. Then a few taps with a hammer on the top (straight down the thread, not sideways, and careful not to damage them) to try to shock free any seizure before undoing them. I’m not sure whether this works or is a placebo, but a snug fitting six sided spanner or socket, a bit of tension and then a sharp movement to undo them has normally worked.

I’ve heard of people wrapping the threads in PTFE tape to try to stop them seizing.
 
  
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Moko
Silverstone


Joined: 12 May 2019
Posts: 120
Location: London


PostPosted: Fri Jan 10, 2020 10:09 am    Post subject: Reply with quote

My brakes were all apparently changed 2 years ago so I’m hoping the bled nipples haven’t seized too hard as the car has always been garaged.

Is it worth putting a dap of copper grease on the nipples when I tighten them back up?
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skinny_monkey
Nürburgring


Joined: 16 Sep 2014
Posts: 475



PostPosted: Fri Jan 10, 2020 10:59 am    Post subject: Reply with quote

No, copper grease is not well compatible with brake fluid. Red rubber grease if you must. But i don't bother, just make sure the rubber dust caps are in good condition
 
  
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maldren
Suzuka


Joined: 07 Oct 2016
Posts: 1231



PostPosted: Fri Jan 10, 2020 12:00 pm    Post subject: Reply with quote

No, definitely not Copperslip grease because the calipers are alloy and copper promotes corrosion between steel and aluminium. Only use ally grease on aluminium (and alloy) components, including your wheel nuts.
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Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7717
Location: Brighton


PostPosted: Fri Jan 10, 2020 8:57 pm    Post subject: Reply with quote

Brakes may have been changed but i doubt the nipples .. if they have then they will come undone with no problem .

No grease whatsoever .. it will contaminate the brake fluid .. i can't say to what degree as its just something that's not done .

In short .. don't force any nipple .. a sharp hit with the palm of the hand on the spanner should undo them .. if too tight then your at the point of they could snap .. so in my case we advise the customer and see if he wants us to try more force with the knowledge it might snap .

Yours will probably be fine but we are covering all bases here to make you aware of possible problems so don't be alarmed .
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My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .



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