XJ XJ6 / XJR6 ( X300 ) 1995-1997

HELP please

Old 03-25-2019, 08:37 PM
Thread Starter
Join Date: May 2009
Location: Jonesboro, Ga
Posts: 58
Likes: 0
Received 4 Likes on 4 Posts
Default HELP please

So, I'm working on a '95 XJ6 4.0 USA version. I was having trouble with the front brake calipers. Replaced both with rebuilt units. Having a bad time bleeding even using the suggested looping the bleeder hose 6 inches vertically and following instructions verbatum. I opened the nipples to try the drip method. Went to check it just now only ti see the barely legible writing on the resivoir reading DOT 4. I filled it with DOT 3. Now what? Any suggestions before I find a bridge to jump from?
Old 03-25-2019, 11:06 PM
Join Date: Feb 2014
Location: The Beautiful Mid-South, U.S.A.
Posts: 16,614
Received 7,689 Likes on 4,287 Posts

Originally Posted by italcarnut View Post
barely legible writing on the resivoir reading DOT 4. I filled it with DOT 3. Now what?
Hi italcarnut,

Don't be too hasty to find a bridge. DOT 4 has Borate Ester added to the base Glycol Ethers to give it a higher boiling point than DOT 3, but as far as I have been able to determine, the fluids are compatible. The DOT 3 should not harm the seals in your brake system.

The dry boiling point of DOT 3 is 205C vs 230C for DOT 4, and the wet boiling point of DOT 3 is 140C vs 155C for DOT 4. Not huge differences, especially if you are a non-aggressive driver who isn't likely to overheat the brake fluid.

However, some references state that Anti-Lock Braking modulators in vehicles for which DOT 4 is specified may not operate properly on DOT 3 due to a difference in viscosity, so if you notice any odd ABS behavior it would be prudent to replace the DOT 3 with DOT 4. This can be done relatively quickly with an inexpensive hand vacuum pump or pressure-assisted bleeding system.



Last edited by Don B; 03-26-2019 at 08:28 PM.
The following 2 users liked this post by Don B:
MountainMan (04-04-2019), Scotlad (03-26-2019)
Related Topics
Thread Starter
Last Post
S-Type / S type R Supercharged V8 ( X200 )
06-25-2018 01:22 PM
XF and XFR ( X250 )
10-21-2016 03:46 PM
Forum announcement archives / Forum History
06-03-2013 11:24 AM
New Member Area - Intro a MUST
11-22-2012 07:26 AM
XJ6 & XJ12 Series I, II & III
07-29-2011 12:30 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Search this Thread
Quick Reply: HELP please

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: