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M38a1 brake fluid type

Al Harvey

Active member
1,153
19
38
Location
Dover, TN
Should be DOT 5 unless someone has changed it out to DOT 3. You can test it by taking a sample and putting it in a small bit of DOT 3 and another part in some DOT 5. The fluids won't mix so you can determine which fluid is in your jeep.
 

NDT

Well-known member
Steel Soldiers Supporter
10,158
5,836
113
Location
Camp Wood/LC, TX
I restored my M38A1 in 1985 using DOT 5. The brakes have worked to this day without maintenance or adding fluid. Try that with DOT 3.
 

papabear

GA Mafia Imperial 1SG
13,508
2,383
113
Location
Columbus, Georgia
I restored my M38A1 in 1985 using DOT 5. The brakes have worked to this day without maintenance or adding fluid. Try that with DOT 3.
Agreed.

It seems like the brake fluid bandit doesn't steal the DOT 5 as much as the DOT 3. I had DOT 3 in my M38A1 for a couple of years but when we put new wheel cylinders and MC on we flushed the system and went back to DOT 5. That's been about 7 years ago...no issues since.
 
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