Re: Members with 4 wheel disc systems: Can you lock yours up ?
[Re: Jerry]
#3143381
05/09/23 12:56 PM
05/09/23 12:56 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
OP
Striving for excellence
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OP
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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i believe at some point there was actually a 7/8 bore diameter master cylinder available too. may want to look into swapping to that. I don't want increased travel. The A body brake booster is a single diaphragm unit. The B body version is a dual. It provides double the boost. I suspect that the difference in the two will make the biggest improvement.
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Re: Members with 4 wheel disc systems: Can you lock yours up ?
[Re: Kern Dog]
#3143453
05/09/23 05:21 PM
05/09/23 05:21 PM
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Joined: May 2019
Posts: 6,497 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,497
nowhere
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I went an looked up the booster my old 96 Mustang had, V6 car 4 wheel discs. 8.732" dual diagphram. When you say " The B body version" what does that mean, specifically. There are many years of "B body" out there. Here's a link to an excel spreadsheet that will let you play with the booster numbers. It was in Feet's brake thread pinned at the top of this forum. manual vs vacuum - uhcoog1.xlss the one you want http://www.3gduster.com/brakes.html
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Re: Members with 4 wheel disc systems: Can you lock yours up ?
[Re: ruderunner]
#3150154
06/10/23 07:32 AM
06/10/23 07:32 AM
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Joined: May 2005
Posts: 211 ILL
Greentween
enthusiast
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enthusiast
Joined: May 2005
Posts: 211
ILL
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To bad you gave up on the hydro boost. Hydro boost is a great solution. My brakes in a Challenger = Hydroboost, 11.75 dia stock slider calipers front, Ford calipers out back, 4 wheel disk GM prop valve (straight thru). Rear parking brake hooked up or not, either way. Easily skids the tires. And that's with a large bore master cylinder.
I should check the psi at the calipers with hydro boost now. Never did because it solved the problem. I'm sure its way more than 1200. When I checked my manual brakes setup with 7/8 bore it was 700 psi. When i switched back to stock power booster (single but large diameter), engine vacuum was 14 and the psi was 1200 at front caliper.
My opinion about stock booster is you need to get the vacuum up near 19-20 to get impressive brake performance.
Last edited by Greentween; 06/10/23 07:37 AM.
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Re: Members with 4 wheel disc systems: Can you lock yours up ?
[Re: Kern Dog]
#3154315
06/26/23 10:06 AM
06/26/23 10:06 AM
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Joined: Jan 2005
Posts: 4,525 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,525
Michigan
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I tried a HB system and it was an epic failure. I couldn't get the HB to build pressure and damaged 3 power steering pumps in the process. What kind of pump are you using? Does it have any shims in it to reduce pressure? I'm asking because I'm thinking about going to a hydroboost setup on my car.
1987 Fifth Avenue - 512/518/D60
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Re: Members with 4 wheel disc systems: Can you lock yours up ?
[Re: Kern Dog]
#3154855
06/28/23 12:23 AM
06/28/23 12:23 AM
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Joined: Dec 2003
Posts: 23,273 Here
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 23,273
Here
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FWIW, locking brakes doesn't decrease your stopping distance. I know that. MY point was that if I'm not able to lock the brakes, I don't know if they are working to their full potential. If I could lock them, I'd know where that point of lock up is and brake up to just below that point FWIW I believe max tire braking effect is when tire is turning at approx 70% of road speed. Other than maybe F1 skilled/talented drivers that is an unattainable goal for us mere mortals. Even Standard ABS does not achieve that on an instantaneous basis, but might get close on average, in that brake pressure is cycled/pulsed to a large degree. The key is not letting the tire stop or slow long enough to allow the rubber to turn effectively to liquid grease at the road contact point. I am sure there are many variables that effect the ideal limited slippage for any given situation to achieve maximum braking.
" All sorts of things can happen when you are open to new Ideas" Inventor of Kevlar
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