I'm going to change the cylinder and fluid as a precaution. The fluid puddled a very small bit and softened the sealer but that was about it. Brake fluid? The fluid in my system is clear and the driver's side cylinder developed a very minor leak that ran down the cylinder and dripped on the seam sealer directly below not on any paint. I don't know what Delco #11 Hydraulic Fluid is.
It says that maintenance filling or replacement should use "Delco #11 Hydraulic Fluid (GM Hydraulic Brake Fluid Super #11 or its equivalent)".
HOW TO BLEED GRAY TRANSMISSION JACK MANUAL
I'm not sure brake fluid was the original fluid as the Body by Fisher manual does not say what the initial fluid was. His description makes me feel better though. The Body by Fisher manual does have a section on filling and bleeding. My question is how would you suggest I flush the system? I'll check the lines but my initial inspection indicates that they actually seem pretty good. Don't have any data now on build date as it was many years ago. Does your pump have a sticker on it for transmission fluid and if not do you think the fluid has been changed? The only other car I have experience with in the past is a low mileage original owner and it was brake fluid. The only other Body by Fisher manual I have is 1970 and all references to fluid in that manual are to automatic transmission fluid. I remember the note saying that automatic transmission pumps had a sticker on them to indicate that they used transmission fluid as all references in the Body by Fisher manual reference brake fluid. I thought it might have been in the Body by Fisher manual but I can't find the reference. I read somewhere that 1967 systems could have either brake fluid or transmission fluid but I can't remember where. If I need to completely flush the system how would I go about doing this? Apparently one of the big advantages to automatic fluid is much better performance in cold weather. The original installation of the hoist used clear #10 hydraulic oil and all the people we discussed this with recommended we change to transmission fluid. Can I change the fluid to automatic transmission fluid without any problems and do I have to flush it completely or will it mix it I get most of it out? I've just been through this with a friends hoist that we moved that has a hydraulic pump. Later models apparently used automatic transmission fluid. The fluid in my system is clear so I'm assuming at this stage that it is brake fluid. In the section on hydraulics the manual states that the fluid is AC Delco Hydraulic fluid #11 or Delco Supreme brake fluid. The Body by Fisher Service Manual is very good on top mechanism service, repair and rebuild. My question is about the hydraulic fluid.
I've never done anything with the system since I purchased the car and it has worked well but has only seen 13,000 miles in 38 years with lots of storage time. I believe the cylinders that are in the car now are the originals as I've owned the car since 1978. One of the cylinders is leaking so I'm going to replace both with aftermarket ones. I have a 1967 Convertible with 75,000 miles that has a power top.
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