2 quick questions

[Corbusa]

Gents , Im wanting to get a couple things done on the Z before winter. my questions are ( I havent changed anti freeze in a long time) when I drain it and refill it will I need to worry about a air lock ?? if so how do I fix that? ,

2nd I think I should replace the brake fluid.. Should I stay with dot3 or go to 4 and if I go with 4 can I just keep bleeding them out and flushing until it has 4 in it? Thanks

[Ccmano]

Here’s the instructions from Marc Haibeck for filling the coolant. Jacking up the passenger side of the car has always worked for me. This last time I made the tool he suggests and it worked like a charm.

http://www.zr1specialist.com/HAT%20W...ersion%203.pdf

On the brake fluid, unless your racing the car somehow Dot 3 fluid is more than sufficient. However Dot 3 and 4 are compatible. The key to flushing the fluid is not letting air into the system at the master cylinder. You don’t want an air bubble to get to the ABS unit. A pressure bleeder is your best bet.
H

[DRM500RUBYZR-1]

DO NOT MIX 3 and 4!
You may change to 4, but only after a complete drain, flush, then fill.
If you cannot do that, then stay with 3.
Mixing can accelerate corrosion.


As for coolant change.
Use green.
find the sticky that describes how to fill the cooling system, but you should be ok.
Try it first, and just monitor the level and what is going on, and you should know if it needs to be burped.
Marty

[Ccmano]

Originally Posted by DRM500RUBYZR-1

DO NOT MIX 3 and 4!
You may change to 4, but only after a complete drain, flush, then fill.
If you cannot do that, then stay with 3.
Mixing can accelerate corrosion.


As for coolant change.
Use green.
find the sticky that describes how to fill the cooling system, but you should be ok.
Try it first, and just monitor the level and what is going on, and you should know if it needs to be burped.
Marty

Marty I have to disagree on Dot 3 and Dot 4 being incompatible. It’s Dot 5 that is not compatible. Dot 4 simply has a higher boiling point but they are essentially the same. Here’s just one article to support that,

https://blog.amsoil.com/whats-the-di...4-brake-fluid/
H

[DRM500RUBYZR-1]

I once believed as you do, regarding 3 and 4, and certainly agree with you on 3or 4 versus 5.
However, I have read a number of articles that indeed are counter to the Amsoil advice on the 3 with 4.
Here is one of them.
https://www.reference.com/vehicles/c...9a6460a6cca209


I therefore drain, flush and fill.
You mileage may vary.
Marty

[spork2367]

Originally Posted by DRM500RUBYZR-1

I once believed as you do, regarding 3 and 4, and certainly agree with you on 3or 4 versus 5.
However, I have read a number of articles that indeed are counter to the Amsoil advice on the 3 with 4.
Here is one of them.
https://www.reference.com/vehicles/c...9a6460a6cca209


I therefore drain, flush and fill.
You mileage may vary.
Marty

That simply isn't true. And the reference you posted is just some question answer page that any joe, dick or harry can respond to regardless of credentials or knowledge.

Mixing the two will have ZERO effect on corrosion in the system.

Dot 5.1 is also compatible with 3 and 4. Not Dot 5. Why did they number them like that? No clue.

3, 4, and 5.1 are all glycol based. 5 is silicon based and not compatible with any others.

Obviously mixing any higher number with a lower number negates a lot of the benefit as the effective boiling point is lowered an unknown amount. And a flush is always good every 10 years or so as the additive packages that prevent corrosion break down.

http://www.brakeandfrontend.com/brak...3-4-5-5-1-faq/

https://www.epicbleedsolutions.com/r...1-brake-fluid/

[DRM500RUBYZR-1]

Originally Posted by spork2367

That simply isn't true. And the reference you posted is just some question answer page that any joe, dick or harry can respond to regardless of credentials or knowledge.

Mixing the two will have ZERO effect on corrosion in the system.

Dot 5.1 is also compatible with 3 and 4. Not Dot 5. Why did they number them like that? No clue.

3, 4, and 5.1 are all glycol based. 5 is silicon based and not compatible with any others.

Obviously mixing any higher number with a lower number negates a lot of the benefit as the effective boiling point is lowered an unknown amount. And a flush is always good every 10 years or so as the additive packages that prevent corrosion break down.

http://www.brakeandfrontend.com/brak...3-4-5-5-1-faq/

https://www.epicbleedsolutions.com/r...1-brake-fluid/

Who do I thank for the info, Tom, Dick or Harry, I think they all work for brake and front end or amsoil.
You (and they ) may certainly mix, feel free and have at it.


I will drain, flush, and fill, ESPECIALLY on someone else's car.


Maybe you are right.
But maybe you are not.
Why chance it over at most, an hour of labor and $10.00 of fluid.
Not a chance I take, so why would I recommend it to someone else?

[lfalzarano]

Marc Haibeck - ZR-1 Specialisy

Has your answers
http://zr1specialist.com/HAT%20Web/a...ersion%203.pdf

Coolant should be changed every 3 years as a rule.

DOT3 is your basic go to fluid. DOT4 has a slightly higher boiling point. DOT5 is silicone based. Big effort is draining and flushing out all the non-silicone fluids. I read a few years back that it was not recommended, but can’t find it.

In any event, there are many more qualified experts on the forum that will chime in with their extensive knowledge.


Lou

[lfalzarano]

You guys are the best!!


Lou

[Corbusa]

Thanks for the replies .. I'm not on the site much- I work too many hours and usually only come on when I need something ( I know I'm wrong - sorry ) at least I'm not a pest
I'm trying to get and stay healthy ( its been a couple year fight ) But I'm getting there, I'm also trying to get the house situated and chores out the way .. sell a vehicle or two - So I have less to do- not enough hours.. Then do what I can do to the Z myself and let Pete do the rest .
I'll read the links and get'er done.. I'll wait to switch fluids to Dot 4 if / when I change the master cylinder .. and start fresh .. I need to order the speed bleeders asap and get that done too ..
I thought of selling the Z but just cant do it .. Thanks to you guys and helping makes me keep it . You save people a lot of time having to search for answers. You are Greatly Appreciated !!!!