DOT Fluid Question for Towing
 

Finishing up rebuilding the front end on the 1994 Caprice Wagon.
This is the Tow vehicle for the 95 Impala SS.

Not exactly S/SS material but is about Brakes.
The front end rebuild gets new everything.
Steering box, centerlink, tie rods, and control arms...
and a new Flaming River Steering Arm....the upgraded works.

The Brake system gets a make over.
New Master Cylinder even though the original is fine.
Calipers and Rotors are fairly new and ran Hawk Front Pads.
All that is now new or recondition back to new painted and assembled.
Again with a fresh set of Hawks Low Dust Pads.

The Rear gets new Spring kit, Wheel Cylinders, Riveted Brake Shoes and using a HD 11 Inch Drum.
The originals had 11.060 stamped on them, the new 11.090 and feel heavier.

The old brake system used GM DOT 3 but looking at DOT 3 Synthetic.
But there is also DOT 3/4 and DOT 4.

Synthetic has a higher boiling temp over standard DOT.
Looking at going with Synthetic DOT 3.

Is there any advantage using DOT 3-4 or DOT 4 over DOT 3?


Dan

Re: DOT Fluid Question for Towing
 

Back in the day, syn was not compatible with current
rubber compounds. Might want to check.
Bob

Re: DOT Fluid Question for Towing
 

For your application, I would recommend Amsoil 500 DOT 3 High-Performance Synthetic Brake Fluid.

In the early days of synthetic fluids, there were problems with seal compatibility. The new brake fluids do not have the issue.

Re: DOT Fluid Question for Towing
 

Why wouldn't you just use the tried and true Dot 3? Still used in many Industrial Applications where load and heat are one of the main factors in operation. Besides its cost effective and when the unexpected happens, almost everyone has some. MB.

Re: DOT Fluid Question for Towing
 

Because the Synthetics have a higher boiling temp rate.

I am also flushing the whole system..

D