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Ecco

Member Since: 31 Oct 2015
Location: Kuala Lumpur
Posts: 279

2014 Defender 110 Puma 2.2 DCPU Galway Green

..Dot4, class 4 vs class 6..

...as i can see in a brochure that came with truck, proper brake fluid should be Dot4, class 6, however, its easier to find holy grail, than class 6 rated brake fluid here, so, question is, can i go with DOT4, class 4?? Am i going to damage anything?

19th Jun 2022 5:06am

Leamreject

Member Since: 19 Dec 2020
Location: Middle Earth - Leamington Spa
Posts: 970

Yes, Dot 4 will be fine. The only one you need to be cautious of is Dot5 as it is silicone based and shouldn’t be mixed with anything, and should only be used in certain vehicles and running conditions I.e. hard track use Ride like you stole it!!
If I’m not on a bike it’s because only a 4x4 will do…
2011 2.4 Puma 90 HT

19th Jun 2022 2:26pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3410

2012 Defender 90 Puma 2.2 CSW Santorini Black

Seems like class 6 is an improvement over class 4, and the former might be slightly better in ABS/ traction control units. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

19th Jun 2022 3:19pm

discomog

Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2526

2015 Defender 90 Puma 2.2 XS CSW Santorini Black

Class 6 has a slightly higher boiling point than class 4. Class 4 and class 6 are compatible and therefore there is no problem mixing them. Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8

19th Jun 2022 3:34pm

90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2142

2016 Defender 90 Puma 2.2 HT Corris Grey

Leamreject wrote:
Yes, Dot 4 will be fine. The only one you need to be cautious of is Dot5 as it is silicone based and shouldn’t be mixed with anything, and should only be used in certain vehicles and running conditions I.e. hard track use

Dot5 is NOT a performance fluid and certainly won't cope with sustained track use as its upper temp ability is only circa 250degC - pukka race fluid is generally capable of somewhere between 300 & 330degC and even dot5.1 is more like 270degC

The only reason for its existence is its long service life for the likes of Military use and the fact it is non-corrosive BUT as its not hydroscopic it can / does cause corrosion and other potential issues when compared to more traditional glycol based fluids - personally avoid like the plague!!

19th Jun 2022 3:50pm

Leamreject

Member Since: 19 Dec 2020
Location: Middle Earth - Leamington Spa
Posts: 970

Thank you for confirming this, I must admit I know to avoid it and certainly not to mix it, it’s a shame people that use it think they are improving on previous versions.

Ride like you stole it!!
If I’m not on a bike it’s because only a 4x4 will do…
2011 2.4 Puma 90 HT

19th Jun 2022 4:34pm

90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2142

Trouble also is lots of people confuse dot5 and the regular glycol based dot5.1....

The 'hidden' issue with silicone fluids is that because they are not hydrscopic and condensation that builds up can potentially become vapour at higher brake system temps and at that point you loose the brakes completely as water vapour is totally compressible.....

19th Jun 2022 6:48pm

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