GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » Leigh Harrison Brake Rotor (Seeking to ID the Leigh Harrison Brake Rotors)
Re: [GMCnet] Leigh Harrison Brake Rotor [message #326712 is a reply to message #326711] Sun, 03 December 2017 23:42 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma:
Senior Member
Why do you feel that DOT 4 is the better rating?

There are differences besides boiling point such as viscosity and anti corrosion.

Problem is that under certain circumstances DOT-4 doesn't last as long; it absorbs moisture faster than DOT-3 and will sometimes have a lower boiling point in 6-months. So count on replacing DOT-4 fluid that often to keep it "better" than DOT-3.

Do not assume that DOT 4 will necessarily be better for your system than DOT 3. There is a reason that DOT 3 is specified for a number of cars. For one the compatibility of the specific rubber types used for components chosen to be in that car's system has been tested using DOT 3 by the braking engineers. Since I keep my vehicles a very long time I would want to know more about whether putting in DOT 4 is the best for a particular system.

There are reasons that DOT 3 is still on the market. If the Department of Transportation felt DOT 4 were “better” why would they still allow DOT 3 to be sold.?

It is not simple to just say one is better. Depending on conditions of use and the system it is in there are times when one could say that DOT 3 is “better”..

Emery Stora
77 Kingsley
Frederick, CO

> On Dec 3, 2017, at 8:48 PM, James Wack wrote:
>
> Rob,
>
> Miguel at MGM GMC looked the coach over before I attempted the drive to Maryland. He had a similar opinion regarding the Brake Guards - worse
> actually, he thought they may result in a fractionally increased brake response time. They will come off, maybe this maintenance cycle. As far as
> the cables - yes, I have access to a swaging tool and will make some up. I would have finished up the bleeding this afternoon but was a little
> shortsighted and only purchased 1 qt of DOT 4 brake fluid. Not sure what the community thinks about DOT 3 vs. 4, but I was committed to the better
> rating considering all the other time and expense I put into the effort.
> --
> Wackster - 1976 23' Crestmont
> Baltimore, Maryland
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: [GMCnet] Heater Motor
Next Topic: Note for those with fueling issues (like Rod & John)
Goto Forum:
  


Current Time: Tue Apr 30 23:26:29 CDT 2024

Total time taken to generate the page: 0.00833 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software