Jump to content


Toggle shoutbox Shoutbox Open the Shoutbox in a popup

@  MrWOT : (18 November 2017 - 05:55 PM)

Well that was fun, did mounts, found engine mount bracket sheared.

@  scottydoggs98 : (03 November 2017 - 11:49 PM)

no way you blew it up lol coupler might be bad already if its clicking when you turn th epulley back and fourth .

@  griff-97gs : (03 November 2017 - 04:43 PM)

blew my supercharger this weekend wen my serpentine belt snapped coming off the freeway anyone know the cost to hav one rebuilt

@  Loly : (23 October 2017 - 08:29 PM)

Check out MPD for hoods, I have one and Crazyguy03 has one as well and they are great for heat release and Cold Air (RAM AIR). Here's the link.... http://www.mpd1.com

@  bad108 : (19 October 2017 - 02:14 PM)

hoods

@  jwguinn : (16 October 2017 - 02:36 PM)

Anyone know the actual flow rate on siemens 60lb injectors? I have seen anywhere 60-65, that is big difference. I used 62 in my tune...

@  jwguinn : (19 September 2017 - 01:35 AM)

nvm I found it. ripoff! I think I will make one...

@  jwguinn : (18 September 2017 - 03:31 PM)

Anyone know the part number or where to get a replacement for the short very curved vacuum line that connects to the throttle body mine is split where it connects...?

@  EnderDRM : (13 September 2017 - 12:04 AM)

So the headers and 3" exhaust is on. Sounds pretty good.

@  bigbird90650 : (31 August 2017 - 09:12 AM)

I'm looking for regal "GSX" emblems. Anyone have any for sale? I am looking for the OEM SLP GSX chrome emblems. Thanks

@  EnderDRM : (30 August 2017 - 09:27 PM)

Hi all, I thought I would get the plugs replaced while the headers are being installed. Recomendations for plugs?

@  Marchi1 : (25 August 2017 - 02:08 PM)

Speedy daddy is the default cheap. I have been running pacesetters for 10 years and with the exception of one issue have had no problems.

@  scottydoggs98 : (22 August 2017 - 02:02 AM)

every now and again you get a poorily built cross over pipe and they dont fit right. only issue with them

@  scottydoggs98 : (22 August 2017 - 02:02 AM)

those are what most of use run, good ol speed daddy

@  EnderDRM : (22 August 2017 - 01:37 AM)

http://speed-daddy.c...cription_tabbed

@  EnderDRM : (22 August 2017 - 01:36 AM)

so what about these?

@  Fast86GN : (21 August 2017 - 09:10 PM)

Where the hell is everyone?

@  chromeGS : (19 August 2017 - 01:07 AM)

Long time since ive been on... hows everyone been

@  WildGS : (12 July 2017 - 04:11 AM)

You are making me do things....I need to spend time on stupid car stuff

@  Marchi1 : (12 July 2017 - 02:35 AM)

How is everyone doing tonight?


Photo
- - - - -

Brake fluid: can synthetic and regular mix?


  • Please log in to reply
10 replies to this topic

#1 RegalBM

RegalBM

    Wheres the Newbie Guide?

  • Members
  • PipPip
  • 67 posts
  • LocationRaleigh, NC
  • First Name:
    Bing

Posted 21 May 2008 - 11:49 PM

I went to Autozone this afternoon trying to buy some regular DOT-3 brake fluid, but surprisingly saw a lot of synthetic fluid, like Prestone and Valvoline, and the regular was rare. The guy at AZ said synthetic is compatible with regular and they can mix. I remember I once read an article on the web saying, once the synthetic fluid is used, it may not be possible to change back to regular any more. Any comments?

Thanks.
  • 0

#2 Scimmia

Scimmia

    Contributing Member

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 1,691 posts
  • LocationDavenport, IA

Posted 22 May 2008 - 01:18 AM

There is no such thing as non-synthetic brake fluid. Some companies use "Synthetic" for marketing, some don't, but it doesn't matter either way.
  • 0

#3 attist178

attist178

    Contributing Member

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 1,941 posts
  • LocationBloomington, MN
  • First Name:
    Timmaah

Posted 22 May 2008 - 03:44 AM

I'm too tired to explain "synthetic" brake fluids...it's complicated and it has big words...lol.

But no, don't mix them. And don't listen to parts store guys...the majority of them have absolutely no idea what they're talking about.

A good rule of thumb: Don't mix stuff with different names.
  • 0

#4 Scimmia

Scimmia

    Contributing Member

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 1,691 posts
  • LocationDavenport, IA

Posted 22 May 2008 - 01:30 PM

I'm too tired to explain "synthetic" brake fluids...it's complicated and it has big words...lol.

But no, don't mix them.


I'd be VERY interested in hearing the explaination, or atleast getting a reference. This is contrary to everything that I've found about brake fluid. Polyethylene Glycol is by it's very nature synthetic, so there is no brake fluid out there that's not synthetic.

Unless you were thinking of DOT5 (silicon) fluid vs DOT3/4, which isn't what we're talking about here.
  • 0

#5 RegalBM

RegalBM

    Wheres the Newbie Guide?

  • Members
  • PipPip
  • 67 posts
  • LocationRaleigh, NC
  • First Name:
    Bing

Posted 22 May 2008 - 03:28 PM

OK, can I do this as a bottomline? Pump the old brake fluid out from the master cylinder reservoir and then put the synthetic fluid in. Since can't get all the old fluid completely out from the brake system, there will still be some mix but it seems to me it should be much better. Would this be fine?
  • 0

#6 oakleafresin

oakleafresin

    I Know Regals

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 1,600 posts
  • LocationShelby Township MI
  • First Name:
    Chris

Posted 22 May 2008 - 03:47 PM

For what its worth, I flushed my brake lines out last year with "Synthetic" Prestone fluid from Autozone and I havent had a single problem stopping. I used a Mitty Vac. I took as much of the old crap out of the master cylinder as I could and refilled it with the Prestone. Then I bled each caliper till clear(ish) fluid came out.

A couple weeks ago I rebled them using this process and the fluid looked opaque and dark brown (rather than black/green) almost like rust. I dont know wtf the deal was with that but the car is still stopping great lol. Im sure dark brown is a normal color though. Would probably turn green eventually.
  • 0

#7 Scimmia

Scimmia

    Contributing Member

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 1,691 posts
  • LocationDavenport, IA

Posted 22 May 2008 - 09:55 PM

OK, can I do this as a bottomline? Pump the old brake fluid out from the master cylinder reservoir and then put the synthetic fluid in. Since can't get all the old fluid completely out from the brake system, there will still be some mix but it seems to me it should be much better. Would this be fine?


Bottom line is that all DOT3/4/5.1 fluids are compatible, and all synthetic. As long as you don't get DOT5, you're fine. I'm guessing that attist178 was confusing synthetic with silicon.
  • 0

#8 Dusty

Dusty

    Member

  • Members
  • PipPipPip
  • 150 posts
  • LocationRocket City, AL

Posted 23 May 2008 - 05:05 PM

+1 on mixing DOT 3/4/5.1 Just say away from DOT 5 silicone
If you have not flushed the fluid recently I would just get a big bottle of Dot 3 or 4 synthetic and change out the fluid. Easy to do with a helper to push the brake pedal.
  • 0

#9 RegalBM

RegalBM

    Wheres the Newbie Guide?

  • Members
  • PipPip
  • 67 posts
  • LocationRaleigh, NC
  • First Name:
    Bing

Posted 03 June 2008 - 01:33 AM

I hope this is the ultimate answer...I got a chance to talk with a good friend of mine today, who holds a chemistry PhD and is a technical team leader in the R&D department of Valvoline. He said no problem to mix the synthetic with the regular ones (I am not going to elaborate his explanation here).

Just wanted to post this fyi and hope it helps.
  • 0

#10 Guest_LSChris_*

Guest_LSChris_*
  • Guests

Posted 03 June 2008 - 06:16 AM

+1 on mixing DOT 3/4/5.1 Just say away from DOT 5 silicone

^^X2
DOT 5 silicone fluid is not compatible with conventional brake fluids and they will seperate over time if mixed. DOT 5 silicone brake fluid can't be used in systems with ABS because the action of the ABS unit will induce air into the system.
  • 0

#11 RegalBM

RegalBM

    Wheres the Newbie Guide?

  • Members
  • PipPip
  • 67 posts
  • LocationRaleigh, NC
  • First Name:
    Bing

Posted 03 June 2008 - 04:11 PM

+1 on mixing DOT 3/4/5.1 Just say away from DOT 5 silicone

^^X2
DOT 5 silicone fluid is not compatible with conventional brake fluids and they will seperate over time if mixed. DOT 5 silicone brake fluid can't be used in systems with ABS because the action of the ABS unit will induce air into the system.


Yes, my friend meant DOT-3/4/5.1 and no mix with DOT-5.
  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

BoHeGeHa Dark Blue 2.1.1 © Thomas Yugar (Chemical Chaos)
Official upgrade for IPB 2.3.x © Michael ( Dev Fuse )
3.X © Upgrade by Dumbledore ( Tppskinning )