Convertible top pump fluid ? ? - Impala Tech
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post #1 of 14 (permalink) Old 05-31-2015, 08:12 PM Thread Starter
 
 
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Convertible top pump fluid ? ?

. . I know this has been asked but I still am not finding the answer. .
. . I have a '65 Impala Convertible. . No owners manual of course. . Which fluid does the manual call for? ? I can't believe it says that it might be brake fluid or it might be trans fluid. .

Last edited by hdcolo; 05-31-2015 at 08:35 PM.
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post #2 of 14 (permalink) Old 05-31-2015, 09:03 PM
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My friends 67 had transmission fluid. Why not flush it and do the same?
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post #3 of 14 (permalink) Old 05-31-2015, 09:16 PM
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My 65 uses transmission fluid (regular ATF) as well.

Two doors, four doors, wagons, and ragtops.
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post #4 of 14 (permalink) Old 05-31-2015, 10:42 PM
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Btw I did a little research and I have found people saying they use brake fluid. Honestly if I were you, I would flush it and add tranny fluid. However, I don't know what the result would be of mixing the two. I can't imagine mixing would be ideal though.
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post #5 of 14 (permalink) Old 06-01-2015, 07:39 AM
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Pull a line and let some fluid out. Do not mix the two it will ruin everything. Most use tranny fluid.
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post #6 of 14 (permalink) Old 06-03-2015, 07:11 AM
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My 65 uses brake fluid. Do not mix. Brake fluid is clear, trans fluid is pink.
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post #7 of 14 (permalink) Old 06-03-2015, 11:23 AM
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As GM built the car, brake fluid was used. Many have changed to transmission fluid because it is less damaging to paint if spilled/leaked. Performance is the same with either fluid.
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post #8 of 14 (permalink) Old 06-03-2015, 12:42 PM
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Not totally true as in addition to being corrosive and an organic (paint) solvent it is very Hygroscopic. As such it absorbs water out of the air; and water and a corrosive (in this case basic fluid) just about guarantees there will be rust forming.

I figured the factory used either ATF (red) or Power Steering fluid (clear) as both are just ten weight hydraulic oil. Brake fluid costs more than hydraulic fluid so I am curious as to why the factory would spec brake fluid.

Did I mention that brake fluid is also highly toxic and sweet to the taste which is why it was banned from use in a lot of household items. It is also highly flammable. All around a bad choice in my opinion for that application.

If I were to use brake fluid I would flush the system and use only DOT 5 brake fluid (purple) as it is silicone based not Glycol Ether.

Big Dave
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post #9 of 14 (permalink) Old 06-03-2015, 07:06 PM
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Quote:
Originally Posted by hdcolo View Post
. . I know this has been asked but I still am not finding the answer. .
. . I have a '65 Impala Convertible. . No owners manual of course. . Which fluid does the manual call for? ? I can't believe it says that it might be brake fluid or it might be trans fluid. .

I do not have the 65 manual but a direct quote from the 66 Fisher body service manual in the folding top section states fill with "GM hydraulic brake fluid super #11, or equivalent".

My 63 shop manual also says use brake fluid. I can't imagine the 65 is different. So if you question is "which fluid does the manual call for?", my answer is GM hydraulic brake fluid super #11, or equivalent.

I am not recommending using brake fluid, everything Big Dave said about it is true. Just trying to answer the question asked.
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post #10 of 14 (permalink) Old 06-03-2015, 08:08 PM
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Don't forget DOT 2 brake fluid changed from Caster Oil (vegetable oil) base to a Glycol Ester base in the early sixties with the introduction of DOT 3. It may be the Caster bean oil was ok but caustic artificial brake fluid wasn't. So this is a complex problem and I think it requires more research

Big Dave
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post #11 of 14 (permalink) Old 06-04-2015, 11:29 AM
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FWIW - the tranny fluid, (or 5.1 Brake) is easier to see in the clear hoses going to the 2 actuators located in each rear seat side-panel area.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #12 of 14 (permalink) Old 04-11-2018, 12:31 AM
 
 
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Hi guys my pump and cylinders for my convertible top 65 impala had transmission fluid from factory. I have read all over the the internet also the best fluid to use is tranny fluid so I put that back in. I recently replaced hoses from pump to convertible top cylinders now it has air in the lines would some one please help me out I am having trouble bleeding the lines can someone PLEASE PLEASE PLEASE help me out thanks Ramon C. THANKS
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post #13 of 14 (permalink) Old 04-12-2018, 11:27 AM
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Quote:
Originally Posted by RCchevyman.75 View Post
Hi guys my pump and cylinders for my convertible top 65 impala had transmission fluid from factory. I have read all over the the internet also the best fluid to use is tranny fluid so I put that back in. I recently replaced hoses from pump to convertible top cylinders now it has air in the lines would some one please help me out I am having trouble bleeding the lines can someone PLEASE PLEASE PLEASE help me out thanks Ramon C. THANKS
The only bleeding process I've used is to leave the fill plug off (after filling) and cycle the top down and up a few times. Check level, fill, repeat as necessary. It's worked for me.

As for type of fluid, ATF fluid works fine and is less corrosive than the brake fluid used by GM. I've used both without problem. I did not mix them.
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post #14 of 14 (permalink) Old 04-12-2018, 09:27 PM
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Ditto everything he said.



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HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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