Brake Flush - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 09-30-2009, 12:44 PM Thread Starter
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Brake Flush

Here's the deal. I want to flush my brakes on my 250 and my suburban. With ABS brakes I was told the best way is to gravity flush them. Slower I know but no chance of compressing air into the fluid. My question is, would it be harmful to leave the engines running while I do this? IF it flows faster, I have never done this before, my only concern would be making sure the reservoir remained filled correct? Any one else done this before?

Also whats the best brake fluid to use?

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post #2 of 8 (permalink) Old 09-30-2009, 01:34 PM
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There's no need to have your motor running while you flush the fluid...

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post #3 of 8 (permalink) Old 10-01-2009, 12:41 PM
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I wouldn't say it's the best way to flush them. While gravity bleeding is a good way to bleed them by yourself, using a person to press on the pedal while your manning the bleeders is my preferred. But, and it's a big BUT, the person in the cab has to know or be prevented from pushing the pedal too far with a brake system that has not be regularly flushed. Even after two years corrosion and start to develop in the back area of the master cylinder where the seals normally don't travel and going into this area during bleeding can tear a cup requiring the master cylinder to be replaced.

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Formerly FMTRVT, Manager of Vehicle Testing - Brakes

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post #4 of 8 (permalink) Old 10-01-2009, 01:41 PM
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Found this in the tech articles section. I used this writeup when I flushed mine the first time. In case you need any pointers-
https://www.thedieselgarage.com/forum...ead.php?t=3018
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post #5 of 8 (permalink) Old 10-01-2009, 02:27 PM
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"gravity" flushing is BAD because it opens the system and permits MOISTURE to
enter the system.

personally i use a mityvac 7300 connected to my compressor (they have stand alone
versions if you dont have compressor)....using the above its a 45min job and i dont
need anyone else to pump the pedal for me.

regarding brake fluid...use the dot4 stuff at a minimum, its compatible & wont
require a complete <alcohol> system flush.

dot 4 has a higher boiling point than dot 3.

I havent used it but ATE makes COLORED brake fluid (blue or orange)...the idea
is during the flush you can see the new color so you know when your flush is
"complete"....this flush you might use the BLUE colored fluid, next flush you would
use the ORANGE colored fluid.

Don R.

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post #6 of 8 (permalink) Old 10-01-2009, 09:39 PM
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Well it doesn't exactly have to be hermetically sealed , and while hygroscopic, it's not like quicklime. As long as your doing the bleed with the cap open 15-30 minutes it should be fine, as long as it's not raining



.

Jack -
Formerly FMTRVT, Manager of Vehicle Testing - Brakes

2003 F-350SC Lariat 4x4 6.0L Auto

Truck Modifications as below in Pictorials on Facebook. Google - Facebook TooManyToys
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post #7 of 8 (permalink) Old 10-01-2009, 09:51 PM
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jack - you ever use the ATE colored fluids ??

Don R.

'04 350 4WD Lariat Crew Longbed (built 05.04)
-------------------

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Gear Vendors Dbl Overdrive Install w/ Pics.
135 Amp Alternator Upgrade/Replacement
50 Gal. Aux Tank; Pump, Filter, Wiring
Truck Audio,
CUSTOM Valentine One Install - LINK
$10 Grill Mod. (protects the coolers) !

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REALTIME -CURRENT DIESEL Pricing <HERE>
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post #8 of 8 (permalink) Old 10-02-2009, 03:22 PM
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Nope, never did, but might this year since my employment situation has changed.

We used to buy cases of brake fluid in gallon cans from NAPA for our tests. We had to use DOT 3 because that is what was in the cars we were testing. We would use DOT 4 if we were testing a vehicle that had that in it OE.

Little known fact is that up to about 5 years ago about 90% of the DOT 3&4 brake fluid in the US was made by Wagner at their Berkeley, MO plant. They would get train carloads of the chemicals used in the composition and pump the mix into the 5gal, 1 gal, and smaller containers. On display they showed all of the companies that they private labeled the product for. The business was sold and I’m not sure who does it now. Possibly overseas, but I haven’t looked at a container of brake fluid in a store for many decades.

Jack -
Formerly FMTRVT, Manager of Vehicle Testing - Brakes

2003 F-350SC Lariat 4x4 6.0L Auto

Truck Modifications as below in Pictorials on Facebook. Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
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