Hydraulic brake assist system
#2202883
11/26/16 04:30 PM
11/26/16 04:30 PM
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Joined: Nov 2016
Posts: 200 Colorado
Bob J
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OP
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Colorado
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I'm working on a 68 Mopar big block for SCCA AutoX Cam class and want to know what folks think of hydraulic brake assist or keep it manual. I have Wilwood brakes front and in the rear. I have never used this type of system and need some input. If any one is running the system did you piece it together or did you buy a kit? Kit
07 Porsche C2 997.1 6spd DD and SCCA Solo II SS 68 Plymouth GTX Convert. 493cu Hotkiss Wilwood Classic air, Building for Solo II Cam 65 Chrysler 300 Convert. project 57 Desoto 2dr. Firesweep 392 Hemi,Wilwood Project with son 2003 Dodge Dakota R/T "DEAD"
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Re: Hydraulic brake assist system
[Re: GoodysGotaCuda]
#2203712
11/28/16 01:57 AM
11/28/16 01:57 AM
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Joined: Nov 2016
Posts: 200 Colorado
Bob J
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The plastic reservoir the Chrysler Type 1 1/16 piston.
07 Porsche C2 997.1 6spd DD and SCCA Solo II SS 68 Plymouth GTX Convert. 493cu Hotkiss Wilwood Classic air, Building for Solo II Cam 65 Chrysler 300 Convert. project 57 Desoto 2dr. Firesweep 392 Hemi,Wilwood Project with son 2003 Dodge Dakota R/T "DEAD"
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Re: Hydraulic brake assist system
[Re: Bob J]
#2204094
11/28/16 10:52 PM
11/28/16 10:52 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
master
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master
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Posts: 4,785
Utah and Alaska
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Hydroboost is a love it or hate it feature, when set up right many like the extra braking pressure it creates while others are happy with manual brakes. Its an expensive experiment that I am planning on doing when I get my care farther along. Tim
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Hydraulic brake assist system
[Re: Bob J]
#2204238
11/29/16 02:43 AM
11/29/16 02:43 AM
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Joined: Jan 2007
Posts: 693 Coronado, CA
go-fish
mopar
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mopar
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Coronado, CA
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I have a HydraTech kit. http://www.hydratechbraking.com/He sold me a kit minus master which I sourced at a parts store. It was a 1 1/8" 1980's Dodge D-100 or D-150 I believe. From my understanding it is a gamble getting a junkyard unit but you can get a rebuilt one from multiple sources, maybe Rock Auto? You can get the master locally too. The master on Hydra Tech's site is #MC8144 http://www.hydratechbraking.com/mastercylinders.html
Last edited by go-fish; 11/29/16 02:57 AM.
70 'cuda: ProCharged 408, Tremec 5 speed, S60,triangulated 4 link, Hydroboost and Wilwoods
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Re: Hydraulic brake assist system
[Re: Bob J]
#2204335
11/29/16 11:31 AM
11/29/16 11:31 AM
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Joined: Sep 2008
Posts: 656 Florida
CJD AUTOMOTIVE
mopar
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mopar
Joined: Sep 2008
Posts: 656
Florida
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You have no pedal "feel" with a hydroboost. It will be next to impossible to modulate the pedal on the threshold of lockup. Do your calcs right, piston area for MC bore, pedal ratio, and you'll have phenomenal manual brakes.
Craig Scholl CJD Automotive, LLC Jacksonville, FL www.CJDAUTOMOTIVE.com904-400-1802 "I own a Mopar. I already know it won't be in stock, won't ship tomorrow, and won't fit without modification"
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Re: Hydraulic brake assist system
[Re: CJD AUTOMOTIVE]
#2204355
11/29/16 12:02 PM
11/29/16 12:02 PM
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Joined: Nov 2016
Posts: 200 Colorado
Bob J
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OP
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Posts: 200
Colorado
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You have no pedal "feel" with a hydroboost. It will be next to impossible to modulate the pedal on the threshold of lockup. Do your calcs right, piston area for MC bore, pedal ratio, and you'll have phenomenal manual brakes. This is the information that I was looking for. It looks like I need to start with manual brakes and I can see how it goes. I can look at the pads that have more bite also but.
07 Porsche C2 997.1 6spd DD and SCCA Solo II SS 68 Plymouth GTX Convert. 493cu Hotkiss Wilwood Classic air, Building for Solo II Cam 65 Chrysler 300 Convert. project 57 Desoto 2dr. Firesweep 392 Hemi,Wilwood Project with son 2003 Dodge Dakota R/T "DEAD"
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Re: Hydraulic brake assist system
[Re: Bob J]
#2204452
11/29/16 02:48 PM
11/29/16 02:48 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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You have no pedal "feel" with a hydroboost. It will be next to impossible to modulate the pedal on the threshold of lockup. Do your calcs right, piston area for MC bore, pedal ratio, and you'll have phenomenal manual brakes. This is the information that I was looking for. It looks like I need to start with manual brakes and I can see how it goes. I can look at the pads that have more bite also but. I sent Wilwood what brakes I was buying along with details on the car. Intended use, tire diameter, weight, estimated weight distribution, pedal ratio, etc and they provided me with a recommended manual master. We will see how it works out.
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Re: Hydraulic brake assist system
[Re: CJD AUTOMOTIVE]
#2217848
12/20/16 04:26 PM
12/20/16 04:26 PM
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Joined: Nov 2003
Posts: 3,577 Long Island, NY USA
BergmanAutoCraft
master
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master
Joined: Nov 2003
Posts: 3,577
Long Island, NY USA
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You have no pedal "feel" with a hydroboost. It will be next to impossible to modulate the pedal on the threshold of lockup. Do your calcs right, piston area for MC bore, pedal ratio, and you'll have phenomenal manual brakes. Now there is some misinformation! This feel is really dependent upon the correct caliper piston diameters. I love this unit and have used on 2 cars that see the track regularly.
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Re: Hydraulic brake assist system
[Re: Bob J]
#2218048
12/20/16 10:42 PM
12/20/16 10:42 PM
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Joined: Jan 2003
Posts: 1,482 Lake Orion, MI
goldduster318
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,482
Lake Orion, MI
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This could help you a lot with manual brake sizing. http://www.jakelatham.com/radical/info/brake_calculators.shtmlWithout knowing your piston sizes or the pedal ratio, I don't really know where you'll end up. It really depends on how much stopping force you want for the pedal force, but I am guessing you'd end up with a 7/8" master cylinder. Using just general rules of thumb, I would start with 1g decel at 100 lb pedal force. I ran my car with my plan of 6.25:1 aftermarket pedals, the cobra braking system, .45 pad mu, and 100 lb pedal force for 1g decel and ended up with a 3/4 bore master cylinder and about the same pedal travel as my current 11.75" cordoba brake system with a 15/16 master cylinder...which is mostly likable, but the pedal force for a good amount of decel is still quite high.
'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip
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Re: Hydraulic brake assist system
[Re: BergmanAutoCraft]
#2218090
12/20/16 11:35 PM
12/20/16 11:35 PM
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Joined: Jan 2007
Posts: 780 Woodinville, WA
Viol8r
super stock
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super stock
Joined: Jan 2007
Posts: 780
Woodinville, WA
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You have no pedal "feel" with a hydroboost. It will be next to impossible to modulate the pedal on the threshold of lockup. Do your calcs right, piston area for MC bore, pedal ratio, and you'll have phenomenal manual brakes. Now there is some misinformation! This feel is really dependent upon the correct caliper piston diameters. I love this unit and have used on 2 cars that see the track regularly. Yes, totally agree. On track regularly and it provides the best of both worlds for being aggressive at the track and cruising on the street. It will definitely let you know if if your pistion diameter balance is off, but all the more reason to get it right.
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