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Discussion Starter · #1 ·
Hi All

I'm about to replace the brake fluid in the GU.
Should i use Dot 3 or Dot 4?
And also do i start at the furtherest wheel from master cylinder and work my way to the closest?

Thanks Pep
 

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Hi Pep, not sure about GU's, but GQ's have a brake proportioning valve at the rear. Apparently this needs to be bled first and (I've been told) is tricky. Not sure about dot 3 or 4.
 

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Discussion Starter · #4 ·
Hi Pep, not sure about GU's, but GQ's have a brake proportioning valve at the rear. Apparently this needs to be bled first and (I've been told) is tricky. Not sure about dot 3 or 4.
Hmm ok must look into that, Thanks

Thanks.
What is the difference between dot3 and dot4?

Pep
 

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DOT3 has approx three times the water absorption ability of DOT4.

DOT4 has a higher boiling temp.

Nissan reccomend DOT3

I use DOT3.
 

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Hi Pep, not sure about GU's, but GQ's have a brake proportioning valve at the rear. Apparently this needs to be bled first and (I've been told) is tricky. Not sure about dot 3 or 4.
I will second that: proportioning valve first, then longest to shortest.
 

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i have been told by several Mech's and learned the hard way dont use DOT4 unless specified, that **** ruined two master cylinders in 4 months, i cant remember exactly but the rubber components in a lot of car models cant handle DOT4 it ends upm making them weak when i bled my system clean of the stuff the fluid was full of rubber particals
thank god my brake seal didnt go. DOT3 is the GO i wouldnt be taking the risk
 

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Dot 4 can be used in dot 3 cases but not the other way around
Not the case with Toyota's

If you use dot 4 in a 100 series master cylinder the pedal will sometime stick down

I believe that for Australian spec Patrol Nissan specify dot 3

Regards Don
 

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The interesting thing is that if you look at the Nissan aust web site NISSAN : GENUINE PARTS (Brake Fluid) it lists the Brake Fluid they sell as a genuine product as being Dot 4

But in the Genuine workshop manual it says never mix Dot 3 & Dot 4 fluid & specifies Dot 3 for aust GU's
If the Patrol came with Dot 3 how do you replace the Brake fluid with Dot 4 without mixing the two

As i said earlier using 4 in some Toyota's can cause problems so i dont agree with the higher number can be used instead of the lower number statement

Regards Don
 

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The interesting thing is that if you look at the Nissan aust web site NISSAN : GENUINE PARTS (Brake Fluid) it lists the Brake Fluid they sell as a genuine product as being Dot 4

But in the Genuine workshop manual it says never mix Dot 3 & Dot 4 fluid & specifies Dot 3 for aust GU's
If the Patrol came with Dot 3 how do you replace the Brake fluid with Dot 4 without mixing the two

As i said earlier using 4 in some Toyota's can cause problems so i dont agree with the higher number can be used instead of the lower number statement

Regards Don
The way you replace without mixing is by doing it properly. The master cylinder needs to be completely emptied of fluid and then topped up with the new fluid (DOT4) you then need to bleed it in the correct order (bias valve (if the car has one),LR, RR, FL, FR. Bleed until the fluid changes colour and comes out clean. IF bleeding via the pedal pump method try not to depress the pedal further than you normally would as this can tear the seal inside the master due to crap build up in the cylinder past usual travel.

An easy way if you have some time on your hand is to gravity bleed. this is good if you are doing it by yourself. basically do as above but when its time to bleed just open the nipple and allow to slowly feed out until the colour changes colour and comes out clean (use a piece of tube so you can see the colour.

As for fluid just go to your local nissan dealer and pick up a bottle. it is dot 4 and it is what they use in all their cars (i've worked at a nissan dealership for the past 6 months).

cheers,
Nic
 

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Dot 3 or Dot 4

The interesting thing is that if you look at the Nissan aust web site NISSAN : GENUINE PARTS (Brake Fluid) it lists the Brake Fluid they sell as a genuine product as being Dot 4

But in the Genuine workshop manual it says never mix Dot 3 & Dot 4 fluid & specifies Dot 3 for aust GU's
If the Patrol came with Dot 3 how do you replace the Brake fluid with Dot 4 without mixing the two

As i said earlier using 4 in some Toyota's can cause problems so i dont agree with the higher number can be used instead of the lower number statement

Regards Don
My 1998 service manual shows dot 3.
From the manual-
Refill with new brake fluid ‘‘DOT 3’’.

My 2004 service manual shows dot 3 or dot 4.
From the manual-
DOT 3 or DOT 4.​

My 2007 shows the same as you have stated Don.
From the manual-
For Europe: Genuine NISSAN brake
fluid, or equivalent DOT 3 or DOT 4
(U.S. FMVSS No. 116)*
7

Except for Europe: DOT 3 (U.S. FMVSS
No. 116)



Depends on what year your vehicle is made I suppose & as already stated by sutto use which one is suitable to your year.
 

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Fully agree with nic on gravity bleeding, so many have wrecked their master by pumping.

Link:

Gravity bleeding brakes - Anybody use this method? - Diesel Forum - TheDieselStop.com

Thought I had more, but if you Google you will find good info.

Just make sure the resivor never gets to low, as it will introduce more air. Tightly recap both resivor and bottle each time, to prevent absorbtion of moisture.

I don't belive you can go up in numbers in brake fluid. In a GQ you will ruin seals if you use Dot 4 ( as sutto stated). The manual states Dot 3. GU may be different.
 

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If it was mine and i knew it had Dot 3 in it and the workshop manual specified Dot 3 i would replace it with Dot 3 (easily available)

Regards Don
 

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JUst buy a vacuum bleeder, there only bout $140 and you have it forever.
 
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