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Discussion Topic:
Wheel cylinders
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sarahcecelia |
08-17-2017 @ 1:13 PM
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Senior
Posts: 1190
Joined: Mar 2013
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Why do wheel cylinders rust and pit? Regular brake fluid is -alchohol and glycerine. alchohol is the "vehicle" and glycerine is the "lubricant." How many "top" mechanics with all those patches on their sleeve know this? Very,very, few!Just ask them.They'll say,"Duh? "Alchohol absorbs moisture(H2o), and that causes the rust and pitting. Flush your system thoroughly with silicone brake fluid.Install silicone brake fluid, and bleed the sustem. You'll get a harder pedal, and your cylinders will last for a very long time. All new cars for the last few years use it, why don't you?
This message was edited by sarahcecelia on 8-18-17 @ 5:25 AM
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Stroker |
08-17-2017 @ 4:08 PM
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Senior
Posts: 1460
Joined: Oct 2009
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The "downside" of course is that silicone brake fluid is not as good a lubricant as the old glycerin stuff. There will be some wear associated on the neoprene cylinder cups with it, and in addition, because of the dissolved air, silicone fluids are up to three times more compressible than glycerin-based fluids. This can contribute to a slightly spongy feeling brake pedal/ This is why silicone fluids are not used in race cars as a spongy pedal makes it difficult to modulate the brake pressure under racing conditions." Would I use it? , OF COURSE, as it helps preserve our "antique" systems.
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sarahcecelia |
08-17-2017 @ 8:36 PM
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Senior
Posts: 1190
Joined: Mar 2013
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Your statement about a spongy pedal is wrong, it gives you a firmer pedal. Who fed you this line? Also, silicone is an excellent lubricant. I guess all the manufacturers aren't too smart for using silicone brake fluid. Let me ask you; what experience do you have as an auto mechanic? when you can match mine of 62 years, then I'll listen to you. Did you know what brake fluid of the past was made of before I told you? I'll bet my last dollar that you didn't!!! Are a starter and a generator the same except that on one the insulators on the commutator are undercut? Which one is? Do you know how to use a growler to check an armature for bad windings? Can you tell me how can you check a generator to see if it works after you rebuild it, before you install it, without using anything but a battery and jumper cables? Do you know why dwell is important and what it denotes? Do you know what the ratio of the cam to the crank is? Do you know what the minimum clearance is on main bearings?I know all this and a lot more. Regards, Steve Lee
This message was edited by sarahcecelia on 8-18-17 @ 5:25 AM
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TomO |
08-18-2017 @ 7:16 AM
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Senior
Posts: 7252
Joined: Oct 2009
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Mr. Lee, This site has been one where the contributors treat every one as a gentleman. If you want to start fights and arguments, please find a site that will accommodate you. Stroker has been a contributor to this site for several years and his wisdom and experience have helped more members that I can count. His answer to your post corrected some of your incorrect information. Your post is only partially correct. Dot 3 fluid will attract water, after that it is incorrect.
Tom
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DD931 |
08-18-2017 @ 8:15 AM
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Member
Posts: 66
Joined: Nov 2014
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Well stated, Tom!!
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kubes40 |
08-18-2017 @ 8:46 AM
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Senior
Posts: 3396
Joined: Oct 2009
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TomO, I agree with your previous post. I, like you, found Steve Lee's post a bit disturbing. Steve, if you're "listening", please, clean up your act. This site has thankfully remained by and large a very friendly and helpful site. And Steve, sixty-two years of experience does not necessarily mean they were sixty-two years without mistakes. Tom, I know you have a numerous years of hands on experience as do I. My experience has been that silicone based brake fluid does in fact offer a softer pedal than glycerin based fluids. Mike "Kube" Kubarth
This message was edited by kubes40 on 8-18-17 @ 2:26 PM
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46coupe |
08-18-2017 @ 11:25 AM
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Member
Posts: 271
Joined: Oct 2015
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I have a wheel cylinder/brake issue. Possibly you all will help me here instead of starting a new thread. The history is: 46 Super Deluxe coupe, rebuilt/ and honed all wheel cylinders, installed new brake shoes, rebuilt master cylinder, replaced front brake hoses as we found the previous ones that looked new but were actually collapsing and locking the wheels. Yesterday I had a weird noise coming from the right rear wheel. Luckily I was only 100 yds from my favorite garage and pulled in to see if I could get the car on the lift. We did and a E-brake retainer fastener had failed and part of the linkage was in the drum. That we fixed. While inspecting the other wheels we found that some were locked up and some were not. Had a devil of a time getting the car in the shop and on the lift. We closed the brake shoes as far as we could and the wheels barely turned. The drums and back plates were not hot. When we finally got the drum off the right front, the left front spun freely. We put the drum back on and could hardly turn the left or right front. We had found fluid in the front cup on the right cylinder. Does the fluid some how equalize in the system? Could this be causing the brake shoes to over tighten and then loosen? I've ordered new front cylinders and will install the old shoes on the front as we think we found a hump in the center of the new shoes. Any Ideas??
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46coupe |
08-18-2017 @ 11:31 AM
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Member
Posts: 271
Joined: Oct 2015
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I have a wheel cylinder/brake issue. Possibly you all will help me here instead of starting a new thread. The history is: 46 Super Deluxe coupe, rebuilt/ and honed all wheel cylinders, installed new brake shoes, rebuilt master cylinder, replaced front brake hoses as we found the previous ones that looked new but were actually collapsing and locking the wheels. Yesterday I had a weird noise coming from the right rear wheel. Luckily I was only 100 yds from my favorite garage and pulled in to see if I could get the car on the lift. We did and a E-brake retainer fastener had failed and part of the linkage was in the drum. That we fixed. While inspecting the other wheels we found that some were locked up and some were not. Had a devil of a time getting the car in the shop and on the lift. We closed the brake shoes as far as we could and the wheels barely turned. The drums and back plates were not hot. When we finally got the drum off the right front, the left front spun freely. We put the drum back on and could hardly turn the left or right front. We had found fluid in the front cup on the right cylinder. Does the fluid some how equalize in the system? Could this be causing the brake shoes to over tighten and then loosen? I've ordered new front cylinders and will install the old shoes on the front as we think we found a hump in the center of the new shoes. Any Ideas?? By the way, I agree with Tom. I'm a novice compared to most of you all and appreciate all the help you all have/will give me. However, I've been on forums that had this issue and eventually that ended up being all it was- people being sarcastic and wasting time convincing everyone how right they were. Thanks for the comments Tom. Hopefully it ends there.
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cliftford |
08-18-2017 @ 2:19 PM
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Senior
Posts: 845
Joined: Jan 2014
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Given that information, I would suspect a problem with the master cylinder not releasing pressure fully.
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fla48 |
08-18-2017 @ 7:13 PM
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New Member
Posts: 128
Joined: Nov 2011
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Thanks Tom.
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