brake fluid question

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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fred varda
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brake fluid question

Post by fred varda » Thu Mar 09, 2017 4:27 pm

did all 151 jeeps use the same
type brake fluid? Is there a way to determine what your jeep my have. A friend of mine has a 1968 151a1 and is not sure what to use. His brake fluid level is a little low and he dos not know what to use
not knowing what the previous owner used.

Any help would be appreciated

Thanks

Fred


markrdje
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Re: brake fluid question

Post by markrdje » Thu Mar 09, 2017 7:51 pm

My 151 had dot3 while my A2 had dot 5
change user name to mark

Rickf
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Re: brake fluid question

Post by Rickf » Fri Mar 10, 2017 3:55 am

Get a cup of water, A cup you will not be using to drink from again. Get a little of the fluid that is in the master cylinder and drop it in the cup. If it immediately turns white and mixes with the water it is DOT-3, it it just floats on top it is DOT-5.

The military only used DOT-5 silicone fluid but after it came into private hands it could have been changed over or worse, the fluids could have been mixed and they are not compatible.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

fred varda
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Re: brake fluid question

Post by fred varda » Fri Mar 10, 2017 3:43 pm

Many thanks for both your replies and not knowing want fluid was put in after it left I will sure try the test Rick

Thanks
Fred

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artificer
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Re: brake fluid question

Post by artificer » Fri Mar 10, 2017 6:51 pm

A very appropriate time to flush the complete hydraulic system [not by pumping the pedal method] replacing all old with new fluid, would be my suggestion. http://jeepdraw.com/images/HOW%20to%20B ... LEEDER.pdf
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.


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