Brake fluid - 5.1?

xram · 17-07-2006, 12:05

Hello Guys

In the next revision I will change the oil brakes. Someone recommend the Ferodo 5.1?
And about quantity, one liter will be enough?

The car is Oct. VRs – AUQ 2003.

Cordially,
A. Luís

Quinten · 17-07-2006, 12:22

I think you mix up two things here. Brake pads (Ferodo DS2500) and Brake fluid (Castrol Super RS 4.1).

Judging by your last statement you want the brake fluid. And IIRC, they come in 500ml bottles, so you'd need two (it is slightly less than 1L).

edit: changed from 5.1 to 4.1 as i had my facts wrong)

AwesomeSarah · 17-07-2006, 12:27

I was told that if you go from dot4 brake fluid on to dot5.1 you have to flush the system.
As this is 2 totally differnt types of fluid?
I think that a good quality dot4 brake fluid is usually ok and just replace it every 2 years as stated in the service manual
Sarah

cheezemonkhai · 17-07-2006, 12:44

Go to super dot 4.1 seems the recomendation as dot 4.1 isn't far behind 5.1 when dry and is much better when wet, so you won't need to change it every 5 minutes.

KenONeill · 17-07-2006, 13:00

Yeah Sarah, you've got that right. Dot 4.1 is a conventional mineral fluid (but higher boiling point than numerically lower specs like dot 3 or dot 4). Dot 5 and 5.1 are silicone based, so you need to flush the system to get the mineral fluid out, and then hope you don't get a water lock (like an air lock but harder to bleed out) in the system.

Dot 5's not worth considering except on dedicated race or rally cars.

***DGW*** · 17-07-2006, 14:19

The fluid capacity of the brake system is 0.6L.

Esabogal · 17-07-2006, 16:36

I use Dot 5.1.

And sorry to disagree but 5.1 is NON silicone based.
DOT 5.1 is Glycol based, the same that Dot 3 and 4. So you can switch between 3, 4 and 5.1 with no problem. You can even mix them up.

nitrovrs · 17-07-2006, 18:33

Quote:

Originally Posted by Esabogal

I use Dot 5.1.

And sorry to disagree but 5.1 is NON silicone based.
DOT 5.1 is Glycol based, the same that Dot 3 and 4. So you can switch between 3, 4 and 5.1 with no problem. You can even mix them up.

.
As far as i'm aware, the above is correct with dot 5 being the silicone fluid and dot 5.1 being interchangeable with 3 and 4.

AwesomeSarah · 18-07-2006, 09:33

I was told different.
So look in to it before you do it , that would be my advice
Sarah

**TaviaRS** · 18-07-2006, 09:37

I thought fluid capacity was 1.5 litres including the ABS chambers

xram · 18-07-2006, 10:23

Hello Again.

The Ferodo Dot 5.1 Brake Fluid is compatible with dot 4.0.
I want to know if someone has tried?
And the full capacity off the system brake (0,6 or 1.5 l)?

http://marketplace.s2ki.com/s2ki/pro...&cat=24&page=1

Cordially,
A. Luís

KenONeill · 18-07-2006, 12:48

Ok guys; I was told by a usually reputable source that dot 5.x was a standard for silicone fliuds.

MC Bodge · 18-07-2006, 13:08

DOT 4 and DOT 5.1 are compatible AFAIK.

I use DOT 5.1 in my mountain bikes. It resists heat, but it needs frequent (well, yearly!) flushing through as it seems to absorb moisture quite quickly.

cheezemonkhai · 18-07-2006, 20:00

Personally I would still go with super dot 4.1 as it performs much better when damp and only marginally worse when wet

Lummox · 18-07-2006, 20:06

As mentioned DOT 3,4 and 5.1 are all the same typre of fluid and can be mixed, however you will alter the spec of the fluid by doing so.

DOT 5 is silicone based and quite different, usually kinda pink in colour aswell.

Super DOT 4 seems to be a good compromise, IIRC DOT 5.1 attracts moisture quicker.

Either way just a damn good fluid change with factory DOT 4 fluid will make a vast difference if the fluid is getting old.

Since DOT 4 fluids were developed, it was recognized that borate ester based fluids offered the potential for boiling points beyond the 446F requirement, thus came the Super DOT 4 fluids - some covered by the DOT 5.1 designation - which exhibit a minimum dry boiling point of 500F (same as silicone, but different chemistry).

Esabogal · 18-07-2006, 20:26

From the Department of Transportation (DOT):

Standard No. 116: Motor Vehicle Brake Fluids

S5.1.14 Fluid color. Brake fluid and hydraulic system mineral oil shall be of the color indicated:

DO3, DO4, and DO5.1 non SBBF colorless to amber.
DO5 SBBF purple.

S5.2.2 Certification, marking, and labeling.

S5.2.2.1 Each manufacturer of a DOT grade brake fluid shall furnish to each packager, distributor, or dealer to whom he/she delivers brake fluid, the following information:

(b) The grade (DO3, DO4, DO5) of the brake fluid. If DO5 grade brake fluid, it shall be further distinguished as "DO5 SILICONE BASE" or "DO5.1 NON SILICONE BASE."

(e) Certification that the brake fluid conforms to DO5 SILICONE BASE, or DO5.1 NON SILICONE BASE as applicable.

richm · 19-07-2006, 00:56

http://www.delphiauto.co.uk/pdf/DOT4...ke%20Fluid.pdf

17-07-2006, 12:05	#1
xram Briskodian Join Date: Oct 2004 Location: Madeira Posts: 29 Members Car: Thanks: 2 Thanked 0 Times in 0 Posts	Brake fluid - 5.1? Hello Guys In the next revision I will change the oil brakes. Someone recommend the Ferodo 5.1? And about quantity, one liter will be enough? The car is Oct. VRs – AUQ 2003. Cordially, A. Luís

17-07-2006, 12:22	#2
Quinten Crossdresser Join Date: Apr 2003 Location: fast lane Posts: 10,000 Members Car: Citroen C-Crosser 2.2HDI Thanks: 25 Thanked 40 Times in 37 Posts	Re: Oil Brekes - 5.1? I think you mix up two things here. Brake pads (Ferodo DS2500) and Brake fluid (Castrol Super RS 4.1). Judging by your last statement you want the brake fluid. And IIRC, they come in 500ml bottles, so you'd need two (it is slightly less than 1L). edit: changed from 5.1 to 4.1 as i had my facts wrong) __________________ Awooga!!! Last edited by Quinten; 17-07-2006 at 12:57.

17-07-2006, 12:27	#3
AwesomeSarah Site Sponsor Join Date: Mar 2006 Posts: 4,025 Members Car: Thanks: 36 Thanked 192 Times in 171 Posts	Re: Oil Brekes - 5.1? I was told that if you go from dot4 brake fluid on to dot5.1 you have to flush the system. As this is 2 totally differnt types of fluid? I think that a good quality dot4 brake fluid is usually ok and just replace it every 2 years as stated in the service manual Sarah

17-07-2006, 12:44	#4
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 15,556 Members Car: Thanks: 111 Thanked 512 Times in 475 Posts	Re: Oil Brekes - 5.1? Go to super dot 4.1 seems the recomendation as dot 4.1 isn't far behind 5.1 when dry and is much better when wet, so you won't need to change it every 5 minutes. __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

17-07-2006, 13:00	#5
KenONeill Briskodian Join Date: May 2006 Location: Normally in Scotland! Posts: 11,149 Members Car: Octavia TDi110 Thanks: 63 Thanked 555 Times in 543 Posts	Re: Oil Brekes - 5.1? Yeah Sarah, you've got that right. Dot 4.1 is a conventional mineral fluid (but higher boiling point than numerically lower specs like dot 3 or dot 4). Dot 5 and 5.1 are silicone based, so you need to flush the system to get the mineral fluid out, and then hope you don't get a water lock (like an air lock but harder to bleed out) in the system. Dot 5's not worth considering except on dedicated race or rally cars.

17-07-2006, 14:19	#6
*DGW* BRISKODA Staff Join Date: Oct 2002 Location: Cambridgeshire Posts: 17,295 Members Car: Octavia 1.8T 4X4 Estate & Fabia vRS Thanks: 51 Thanked 207 Times in 156 Posts	Re: Oil Brekes - 5.1? The fluid capacity of the brake system is 0.6L. __________________ Denis 2002 Octavia 1.8T 4X4 turbo Estate - rebreathed on by Jabba ... 31.93mpg 2007 Fabia vRS - CC, ESP and full leather trim by Seat Surgeons ...48.57 mpg...

17-07-2006, 16:36	#7
Esabogal Briskodian Join Date: Nov 2002 Posts: 20 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	Re: Oil Brekes - 5.1? I use Dot 5.1. And sorry to disagree but 5.1 is NON silicone based. DOT 5.1 is Glycol based, the same that Dot 3 and 4. So you can switch between 3, 4 and 5.1 with no problem. You can even mix them up.

18-07-2006, 09:33	#9
AwesomeSarah Site Sponsor Join Date: Mar 2006 Posts: 4,025 Members Car: Thanks: 36 Thanked 192 Times in 171 Posts	Re: Brake fluid - 5.1? I was told different. So look in to it before you do it , that would be my advice Sarah

18-07-2006, 09:37	#10
TaviaRS Dinosaur Join Date: Oct 2002 Location: North of the Watford Gap Posts: 14,942 Members Car: Merc E class & SLK Thanks: 19 Thanked 42 Times in 38 Posts	Re: Brake fluid - 5.1? I thought fluid capacity was 1.5 litres including the ABS chambers __________________ A jolly sensible Mercedes E class saloon in a rather fetching bluey grey colour. No it isn't fast, no it isn't modded, and yes, it will still eat your Fabia for breakfast. Official mobile chicane for Briskoda trackdays

18-07-2006, 10:23	#11
xram Briskodian Join Date: Oct 2004 Location: Madeira Posts: 29 Members Car: Thanks: 2 Thanked 0 Times in 0 Posts	Re: Brake fluid - 5.1? Hello Again. The Ferodo Dot 5.1 Brake Fluid is compatible with dot 4.0. I want to know if someone has tried? And the full capacity off the system brake (0,6 or 1.5 l)? http://marketplace.s2ki.com/s2ki/pro...&cat=24&page=1 Cordially, A. Luís

18-07-2006, 12:48	#12
KenONeill Briskodian Join Date: May 2006 Location: Normally in Scotland! Posts: 11,149 Members Car: Octavia TDi110 Thanks: 63 Thanked 555 Times in 543 Posts	Re: Brake fluid - 5.1? Ok guys; I was told by a usually reputable source that dot 5.x was a standard for silicone fliuds.

18-07-2006, 13:08	#13
MC Bodge Briskodian Join Date: Dec 2005 Location: North West England Posts: 899 Members Car: Octavia vRS Thanks: 0 Thanked 1 Time in 1 Post	Re: Brake fluid - 5.1? DOT 4 and DOT 5.1 are compatible AFAIK. I use DOT 5.1 in my mountain bikes. It resists heat, but it needs frequent (well, yearly!) flushing through as it seems to absorb moisture quite quickly. __________________ Mk1 Octavia vRS. The thinking man's Hot Hatch. PS. Give Cyclists Room! We're quite vulnerable. If I can slap your window, you're too close Last edited by MC Bodge; 18-07-2006 at 13:11.

18-07-2006, 20:00	#14
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 15,556 Members Car: Thanks: 111 Thanked 512 Times in 475 Posts	Re: Brake fluid - 5.1? Personally I would still go with super dot 4.1 as it performs much better when damp and only marginally worse when wet __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

18-07-2006, 20:06	#15
Lummox Cupra Bush King Join Date: Sep 2003 Location: Newport Pagnell Posts: 22,438 Members Car: Mk2 Golf GTi 16v and building a 20VT MK2. Images: 2 Thanks: 22 Thanked 747 Times in 627 Posts	Re: Brake fluid - 5.1? As mentioned DOT 3,4 and 5.1 are all the same typre of fluid and can be mixed, however you will alter the spec of the fluid by doing so. DOT 5 is silicone based and quite different, usually kinda pink in colour aswell. Super DOT 4 seems to be a good compromise, IIRC DOT 5.1 attracts moisture quicker. Either way just a damn good fluid change with factory DOT 4 fluid will make a vast difference if the fluid is getting old. Since DOT 4 fluids were developed, it was recognized that borate ester based fluids offered the potential for boiling points beyond the 446F requirement, thus came the Super DOT 4 fluids - some covered by the DOT 5.1 designation - which exhibit a minimum dry boiling point of 500F (same as silicone, but different chemistry). __________________ www.unit18.co.uk Remapping Service now available, PM for details. Last edited by Lummox; 18-07-2006 at 20:09.

18-07-2006, 20:26	#16
Esabogal Briskodian Join Date: Nov 2002 Posts: 20 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	Re: Brake fluid - 5.1? From the Department of Transportation (DOT): Standard No. 116: Motor Vehicle Brake Fluids S5.1.14 Fluid color. Brake fluid and hydraulic system mineral oil shall be of the color indicated: DO3, DO4, and DO5.1 non SBBF colorless to amber. DO5 SBBF purple. S5.2.2 Certification, marking, and labeling. S5.2.2.1 Each manufacturer of a DOT grade brake fluid shall furnish to each packager, distributor, or dealer to whom he/she delivers brake fluid, the following information: (b) The grade (DO3, DO4, DO5) of the brake fluid. If DO5 grade brake fluid, it shall be further distinguished as "DO5 SILICONE BASE" or "DO5.1 NON SILICONE BASE." (e) Certification that the brake fluid conforms to DO5 SILICONE BASE, or DO5.1 NON SILICONE BASE as applicable.

19-07-2006, 00:56	#17
richm Briskodian Join Date: Jun 2006 Location: Melksham Posts: 540 Members Car: vRS Thanks: 3 Thanked 26 Times in 25 Posts	Re: Brake fluid - 5.1? http://www.delphiauto.co.uk/pdf/DOT4...ke%20Fluid.pdf

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