Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: imfixinmopars426]
#1049357
08/08/11 09:02 PM
08/08/11 09:02 PM
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Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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We use it in the letter carrier vehicles and it works great,no problems at all.
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: Chris2581]
#1049358
08/08/11 09:38 PM
08/08/11 09:38 PM
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Joined: Jul 2003
Posts: 1,212
Canton, Ohio
Crazy68Dart
pro stock
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pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
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I talked to a tech at Wilwood about this very topic. He didn't mention the air bubble issue, so I cannot comment on that. He did say that the dot 5 fluid does not absorb water. This might sound like a good thing, but brake fluid was designed to absorb water, which condenses in the lines. Have you ever spilled brake fluid on the floor of your garage, and check it out the next day? Pretty wild, right? Otherwise, the water will form, and compress, over time, causing a spongy pedal.
He told me that I might have to bleed the brakes more often with dot 5, depending on climate, driving styles, frequency, conditions, etc. He said that he would absolutely not recommend dot 5 for a road race style car. However, mine being more of a show/street cruiser (i.e. not extreme endurance) he said to absolutely use dot 5 so as to not accidentally ruin any painted parts.
383, Hemi 4-Speed, AlterKtion, D60
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: 65rbdodge]
#1049360
08/09/11 09:45 AM
08/09/11 09:45 AM
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Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
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I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
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Quote:
i have dot5 in 3 cars and never had any problem bleeding/soft pedal. maybe someone shook up the dot5 container befor adding it to the master cyl.? i`m not sure how this old wives tale got started. just like the thin wall cyl. block casting.
you cant bleed them as fast as dot 3 - with dot 5 if you push the pedal fast then the air will be introduced into the system, and then you will have to let it sit before a final bleed.
Otherwise just push the pedal slowly and it will not accept the air from the mc.
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: imfixinmopars426]
#1049361
08/09/11 09:45 AM
08/09/11 09:45 AM
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Joined: May 2003
Posts: 3,053
N.W. Florida
Fat_Mike
master
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master
Joined: May 2003
Posts: 3,053
N.W. Florida
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Quote:
liquid being compressable is our discussion here also.we all know its not,but why rumors of soft pedal?? this is one of my concerns.we power bleed,pedal bleed this thing to death.any onter input would be excellent! thanks guys,mike
Please outline all the work you did that led to this problem, and the model/year vehicle.
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: Fat_Mike]
#1049362
08/09/11 01:22 PM
08/09/11 01:22 PM
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Joined: Dec 2004
Posts: 116
Va Usa
beecrazy
member
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member
Joined: Dec 2004
Posts: 116
Va Usa
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: Fat_Mike]
#1049364
08/09/11 03:09 PM
08/09/11 03:09 PM
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Joined: Jun 2005
Posts: 4,041
michigan woods
imfixinmopars426
OP
master
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OP
master
Joined: Jun 2005
Posts: 4,041
michigan woods
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Quote:
Quote:
liquid being compressable is our discussion here also.we all know its not,but why rumors of soft pedal?? this is one of my concerns.we power bleed,pedal bleed this thing to death.any onter input would be excellent! thanks guys,mike
Please outline all the work you did that led to this problem, and the model/year vehicle.
1964 sport fury,removed factory front drums,and replaced them with wilwood brake system,through summit. kept factory rear 11"drums. installed a adjustable prop valve,10# residual for rears,and using also the wilwood 7/8" master,per wilwood.pedal ratio is 6.2:1,and also using all 3/16 line,and steel flex,instead of rubber. terrible pedal,after several bleedings,pedal,and power bleed,plus we "bedded" the brakes asap per wilwood specs. finally installed a 1" wilwood master,and caused much better pedal,but more effort. its ok at best now,with NO help from wilwood tech.still has spongy pedal,and bled it slow,and in order...rh outer caliper,then inner...ect. i am unimperssed with wilwood tech,IF you want to call it that,and for the price,i would have went with someone elses product,for now on...thats the story...mike...oh and now,i wold think it would be impossible to lock the brakes at any point....sad.
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: can.al]
#1049365
08/09/11 07:51 PM
08/09/11 07:51 PM
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Joined: Jan 2003
Posts: 21,507
N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,507
N.E. OHIO, USA
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Quote:
...you can get dot 5 that is not silicone.
..dot 5 has a higher boiling point than dot 4,necessary for circle track.
I think that is DOT 5.1 (Five point one) that is NOT silicone and was developed for ABS.....
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Re: dot 5 vs. dot 3/4 brake fluid. whats the deal?
[Re: Mr T2U]
#1049367
08/10/11 10:05 PM
08/10/11 10:05 PM
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Joined: Jun 2004
Posts: 893
Tustin, CA
pishta
super stock
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super stock
Joined: Jun 2004
Posts: 893
Tustin, CA
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You can "degas" many fluids with a mightyvac, just get a good seal on the litte container they give you and pump as much as you can. I used that method to degas resin before I poured it into a mold. There is a video on a resin site that shows a vacuum pump doing this, it pumps and all of a sudden all these bubbles appear and rise to the surface, in essence boiling them out without heat. I dont think the spongy pedal is the fault of the air, I bet its your seals not designed to work with DOT5 fluid.
12 Grand Caravan
06 T&C
02 T&C
96 Breeze
65 Barracuda "S"
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