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Mark.T
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PostPosted: Thu May 19, 2005 8:02 am 
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Better safe then sorry anyway Andy :)

Looking forward to this update Rob :D


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Roadster Robbie
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PostPosted: Fri May 20, 2005 7:13 pm 
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BA's with a VIN serial number after 100110 have different seals/hoses and DOT 4 brake fluid can be used 8)


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nickj633
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PostPosted: Sun May 22, 2005 3:05 pm 
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The vehicle's manual for my 1998 1.5 says that either DOT3 or DOT4 may be used, so hopefully there won't be any issues.
I changed the brake fluid on mine a few months ago, with no problems, using DOT4.


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locklin
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PostPosted: Sun May 22, 2005 10:40 pm 
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My manual says DOT 4 and I've been using it since my car was brand new, no problems so far...


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andym323
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PostPosted: Sun May 22, 2005 11:02 pm 
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Nice one Rob :D

That clears that up, do those 6 digits relate to the last 6 of the VIN, which on mine is 103300????

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GOGOBROOM
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PostPosted: Mon May 23, 2005 12:03 am 
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will be replacing mines this week so will check :P

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DuFFMaN
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PostPosted: Mon May 23, 2005 12:14 am 
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Andys is the M reg... And mine is an R reg.. That makes me safe yeah?...

by the way... Im sure my VIN number is higher than that... Checked it and could find no number lower than wat robbie just said... Cheers for the info 8)


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Mark.T
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PostPosted: Mon May 23, 2005 7:48 am 
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You could also check the top of your brake fluid reservoir - mine (M plate) says "DOT 3 only".


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Toyboy
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PostPosted: Mon May 23, 2005 1:16 pm 
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Yay for that,looks like im in the clear :D


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fil_auto
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PostPosted: Mon May 23, 2005 1:33 pm 
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Mark.T wrote:
You could also check the top of your brake fluid reservoir - mine (M plate) says "DOT 3 only".


Mark


Pretty sure mine says the same Mark.

Phil


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andym323
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PostPosted: Mon May 23, 2005 5:07 pm 
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and mine :)

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DuFFMaN
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PostPosted: Mon May 23, 2005 8:00 pm 
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And mine.... DAMMIT :roll:


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Roadster Robbie
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PostPosted: Mon May 23, 2005 8:41 pm 
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They all say "only DOT3" on the caps. The 100110 refers the the last 6 numbers of your VIN, the cars serial number 8)


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andym323
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PostPosted: Mon May 23, 2005 9:03 pm 
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All that for nothing, i can use DOT4, how dumb do i feel :oops::oops:

Least we got it cleared up tho, score another one for the mighty forum :D:D:D:D

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Arnie
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PostPosted: Sun Jun 05, 2005 10:06 pm 
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Not allcars have them, I have never seen it on my 3 mazdas.


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brodie_76
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PostPosted: Wed Jun 22, 2005 11:07 pm 
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Guys any of the dot rated brake fluid is compatible EXCEPT dot 5 which is racing spec stuff.

Brake fluid is designed not to rot seals, and the replacement interval is due to the fact that brake fluid is hygroscopic - i.e. it will readily adsorb moisture which is a bad thing.

When buying brake fluid always buy small containers as it doesn't sit around well.

Brodie


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Mark.T
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PostPosted: Thu Jun 23, 2005 8:10 am 
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brodie_76 wrote:
Guys any of the dot rated brake fluid is compatible EXCEPT dot 5 which is racing spec stuff.

Is 5.1 OK?

brodie_76 wrote:
Brake fluid is designed not to rot seals, and the replacement interval is due to the fact that brake fluid is hygroscopic - i.e. it will readily adsorb moisture which is a bad thing.

On the contrary, it's a good thing. If it didn't absorb moisture, the water would sit in the bottom of the brake system which is the calipers. There it would just sit and boil giving you spongy brakes (that's a disadvantage with dot 5.1 which doesn't absorb moisture).


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Pyro16
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PostPosted: Thu Jun 23, 2005 8:16 am 
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bugger, at work we have been doin loads of brake bleeds, and over the last two months i must have collected about 20 bottles of castrol dot 4 brake fluid from the left overs.


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brodie_76
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PostPosted: Thu Jun 23, 2005 10:13 am 
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Hi Mark,

Dot 5.1 *should* be ok as it is glycol based (like dot 3 and 4) and not silicone based like dot 5 (which incidentally isn't recognised in Europe)

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On the contrary, it's a good thing. If it didn't absorb moisture, the water would sit in the bottom of the brake system which is the calipers. There it would just sit and boil giving you spongy brakes (that's a disadvantage with dot 5.1 which doesn't absorb moisture).


Um dude, I don't know who told you this but they were talking sh!t

Braking systems are sealed systems - what the f*** is the water coming from?

Dot 3 4 and 5.1 are hydroscopic (adsorb water) but give more of a precise "feel" than silicone based 5 stuff which isn't hydroscopic and hence retains it's high boiling point. (besides many dot 4 fluids are higher boiling point than 5.1)

Water in your dot 3 4 or 5.1 is baaaaad thing as it lowers the boiling point of your fluid which will then lead to brake fade and a spongy feel should it overheat (as this will further change the chemical properties of your fluid)

And yes I know rapid heating and cooling can cause moisture, but in a sealed system with no moisture this moisture is negligible, but over time can become significant, hence the recommended replacement of fluid at two year intervals for just about every manufacturer going.


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Dragon Rob
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PostPosted: Thu Jun 23, 2005 10:16 am 
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The garage I use (Ferrari, Porsche & Merc specialists, so pretty good) told me the only real difference between DOT 3 and 4 is that DOT 4 has a higher boiling point due to it being fully synthetic where as DOT 3 is part synthetic.

He said there is no reason that it would rot the seals, which seems to make sense as DOT 3 seem's to be disappearing fast! (The garage said they would need to order it in especially if I wanted the system flushed and changed, but they would have done it for free) :thumbright:

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Mark.T
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PostPosted: Thu Jun 23, 2005 1:13 pm 
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brodie_76,

I stand corrected on the DOT5 and 5.1 - I got the two mixed up (in my head).
You can get the DOT5, but as you know, it's not common. Over time (years), as you say, moisture can build up and corode the system, so people with classic cars sometimes use DOT5. And aparently it doesn't perform as well.

Mark.T wrote:
On the contrary, it's a good thing. If it didn't absorb moisture, the water would sit in the bottom of the brake system which is the calipers. There it would just sit and boil giving you spongy brakes (that's a disadvantage with dot 5.1 which doesn't absorb moisture).

brodie_76 wrote:
Um dude, I don't know who told you this but they were talking sh!t

brodie_76 wrote:
...this moisture is negligible, but over time can become significant


Aparently, they weren't talking sh!t :)

I agree that there shouldn't be water in the system (moisture can be water when there is enough of it). You're right that moisture in the system reduces the boiling point - and quite significantly too! So yep, it should be changed regularly - especially if you do alot of heavy breaking.


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Pyro16
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PostPosted: Thu Jun 23, 2005 8:53 pm 
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i work on jaguars, and they recommend a brake cfluid change every two years, they use dot 4.

i have loads of that if anyone wants to buy some.


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brodie_76
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PostPosted: Thu Jun 23, 2005 10:02 pm 
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Mark, sorry for the garbled reply was in a rush this am.

What I meant was that brake fluid adsorbing moisture is a bad thing (and that whoever told you it was good was talking crap) - contrary to popular belief most water contamination comes from the filler cap not the condensation from heating and cooling during the braking cycle.


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Mark.T
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PostPosted: Fri Jun 24, 2005 5:20 pm 
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Fair doos :)

Mark

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Roadster Robbie
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PostPosted: Sun Jun 26, 2005 8:54 pm 
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If you get water/moisture in your brake fluid and it boils it causes small air bubbles, because air is compressable thats what gives you a spongy pedal 8)


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BLACKADDA1
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PostPosted: Thu Aug 18, 2005 11:46 pm 
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Just thought id ask... whats the easiest and quickest way of changing the brake fluid... i have just realised that i have had the car 2 years now and have never changed it! And i dont think it was changed with any of the services....


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Smotter
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PostPosted: Fri Aug 19, 2005 8:34 am 
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BLACKADDA1 wrote:
Just thought id ask... whats the easiest and quickest way of changing the brake fluid... i have just realised that i have had the car 2 years now and have never changed it! And i dont think it was changed with any of the services....


See http://www.club323f.com/club323f/forum/viewtopic.php?t=1150&postdays=0&postorder=asc&start=0 - fourth post from the top. It explains how to flush the brake fluid. At this point, I must emphasise the need to keep topping up the reservoir ...

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Roadster Robbie
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PostPosted: Tue Aug 30, 2005 10:03 pm 
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DOT 3 fluid contains Baric acid which is harmfull to the seals.


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Alan
 Post subject: brake fluid
PostPosted: Sat Jul 22, 2006 10:53 pm 
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Evenin all. I actually work in the motor trade and I do sell brake fluid. Just want to point out that on the bottles of dot 4 fluid sold by both lockheed and tetrosyl it clearly states that you can safely mix dot 4 with dot 3 and also dot 5. Now I hate to spoil the fun of the lad who calls mechanics muppets but in my origional mazda handbook for my 323f 1.5 it clearly says at the back under the lubricant specifications that you can use either dot 3 or dot 4.


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Alan
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PostPosted: Sat Jul 22, 2006 11:12 pm 
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Oh crap i've dropped a bollock! I disn't see the second page of the topic where everyone said they found out about the brake fluid in their owners manuals. To make it worse my reply ended up sounding really snotty! Guess I owe you all an apology for being a dick, sorry lads :colors:


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