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#1 |
Registered User
Join Date: Jun 2017
Location: Peoria, Arizona
Posts: 274
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Under cab or firewall mounted master cylinder
I am at the point of deciding to have the master cylinder(and hydroboost) under the cab or mounted on the firewall. I would love to hear any pros/cons to either. I like the look of not having it on the firewall, but...
It is a custom build so I don't have either set up right now. |
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#2 |
Registered User
Join Date: Nov 2010
Location: calgary alberta
Posts: 8,026
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Re: Under cab or firewall mounted master cylinder
check ogre's set up. works well and home built I think. leaves more room for other stuff under the floor.
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#3 |
Registered User
Join Date: Jun 2017
Location: Peoria, Arizona
Posts: 274
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Re: Under cab or firewall mounted master cylinder
I tried looking, but Photobucket hides all of his pics...
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#4 |
Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,503
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Re: Under cab or firewall mounted master cylinder
They work great on the firewall and are easy to service there but they are really ugly when it comes to having a decent looking engine compartment and negate a lot of the work guys do to have a great looking engine and engine compartment.
Mine is going under the floor where it belongs simply because I don't want all the work and money I have put into the engine and engine compartment compromised in appearance by the master cylinder and booster being up there. If I had a plain engine and wasn't worried about how things looked under the hood outside of being orderly and clean I would probably put it there if I had an automatic and didn't need the clutch pedal that goes on the same shaft that the brake pedal does. It's easier as long as you properly reinforce the firewall so it doesn't flex and crack where the brakes are bolted up.
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Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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#5 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,631
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Re: Under cab or firewall mounted master cylinder
an AD firewall just doesn't look right with a big ol booster hanging on it....mines going under the floor....big thumbs up for hydroboost as well...
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#6 |
Registered User
![]() Join Date: Aug 2012
Location: West Side of the valley, CA
Posts: 878
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Re: Under cab or firewall mounted master cylinder
I'm just finishing up a hydroboost install. Unfortunately I had to go on the firewall.. .
![]() I'm definitely a fan of frame mount pedals, just couldn't make it work with what I had at the time and I didn't want to fiddle with them at the time. |
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#7 |
Registered User
Join Date: Aug 2011
Location: Tucson, AZ
Posts: 917
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Re: Under cab or firewall mounted master cylinder
I'm a make it pretty kind of guy along with too much engine, too much cam and intake.....normal hot rod guy. I'm at the point where I wish I'd put the booster on the firewall. I'm continually fighting what I consider heat related issues because the headers/collectors run so close to the booster/MC. Pedal effort/effectiveness isn't the same from cold to hot on a heat soak in traffic cruise. I'm using a dual diaphragm 8" booster, once again for pretty. Didn't want ugly lines coming from the PS pump back to the hydro-boost. I will NEVER make that choice again. Hydro-boost just solves too many problems for the performance engine guys, especially since I already had PS....DUH!
Just random thought for you to consider as I once again have the truck in the air fighting with, you guessed it, brake problems. Maybe my standards are just too high......? |
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#8 |
Senior Member
![]() Join Date: Aug 2010
Location: Shasta Lake, CA.
Posts: 1,619
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Re: Under cab or firewall mounted master cylinder
Speed bump
Can you post a pic or your hydroboost steup
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Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275 |
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#9 |
Registered User
Join Date: Jan 2014
Location: Payson
Posts: 428
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Re: Under cab or firewall mounted master cylinder
I have a Auto City Classic Inc 8" Booster and Chrome master cylinder that bolts to the firewall
for my 58 Cameo, Yes, I like the Smooth Firewall's,"But" I went this way as I stand 6'4" and wanted to go with the Swing Pedal verses stock threw the floor board to gain more room. I bought the CPP's Firewall #5559FMB Mount Pedal/Booster Bracket after seeing Roger1's set up. I am probably Old School when it comes to this but like Chrome and think this will work just fine for me! Allen |
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#10 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,631
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Re: Under cab or firewall mounted master cylinder
g&r...I think bump stated he has a 8" dual diaphragm booster... (for pretty)..and he wishes he had hydroboost....
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#11 |
Registered User
Join Date: Nov 2013
Location: Mechanicville NY (upstate)
Posts: 191
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Re: Under cab or firewall mounted master cylinder
Hi tdishon
My last two vintage vehicles had the master cylinder under the floor...never fun working on them at all...put it on the firewall where all the modern day cars have them...way easier to bleed out too...gravity feed is a wonderful thing.... my 2 cents MikeC
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#12 |
Registered User
Join Date: Jun 2017
Location: Peoria, Arizona
Posts: 274
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Re: Under cab or firewall mounted master cylinder
Thanks for ur input everyone. I think the firewall mount will be more fuctional, but a under cab hydroboost with a master cylinder that has a plastic reservoir (to make checking fluid level easy) might be a starting point for me. I know I need the 2 pound anti-bleed back valves too. I'm still on the fence. I have some time before I tackle this part of the build. Any picks of your master/booster combo would be great!
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#13 |
Registered User
Join Date: Aug 2011
Location: Tucson, AZ
Posts: 917
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Re: Under cab or firewall mounted master cylinder
Here's the best pic I have of mine. Looks a lot more cluttered and tight when the cab and accessories are on. Works just OK. Using a H-boost in the same app might be the answer. I can't due to lack of space rearward toward the substantial trans. cross member. Hydroboosts are longer than even dual dia. boosters.
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#14 |
Registered User
Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: Under cab or firewall mounted master cylinder
if you use chrome for a browser check this out photosuckit fix
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#15 |
Registered User
Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: Under cab or firewall mounted master cylinder
i made my own bracket for this 03 ford cobra hydroboost and have added a remote reservoir
but i have also seen an easier way use the stock swing arm cut out the back of the existing mc and run a rod to the hydroboost easy peasy compared to what i did ![]()
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#16 |
Registered User
Join Date: Nov 2010
Location: calgary alberta
Posts: 8,026
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Re: Under cab or firewall mounted master cylinder
hey, good idea ogre. never thought of that one. prolly work great though.
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#17 |
Senior Member
![]() Join Date: Aug 2010
Location: Shasta Lake, CA.
Posts: 1,619
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Re: Under cab or firewall mounted master cylinder
Thanks Speed bump
__________________
Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275 |
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#18 |
Registered User
Join Date: Jun 2017
Location: upper midwest
Posts: 1,129
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Re: Under cab or firewall mounted master cylinder
My MC setup
![]() Personally I like the MC under the floor because of aesthetics. I put a lot of work into cleaning up the engine compartment... ![]() |
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#19 |
Registered User
Join Date: Jan 2016
Location: Inglewood, CA
Posts: 324
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Re: Under cab or firewall mounted master cylinder
I kept mine under that cab for the same reason as black_sheep. I like a clean firewall.
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#20 |
Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,503
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Re: Under cab or firewall mounted master cylinder
That is one nice looking setup BAM.
I had a full size booster on my 48 in the early 80s an that is one reason I am not found of them on the firewall. Open the hood at a show that it was required (ISCA judging sheet) and there was that booster and master cylinder. That and I am shooting for a built in the late 50's custom truck look with a lot of finned aluminum on the six.
__________________
Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. |
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#21 | |
Registered User
Join Date: Feb 2016
Location: Hebron
Posts: 1,140
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Re: Under cab or firewall mounted master cylinder
Quote:
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#22 |
Registered User
Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: Under cab or firewall mounted master cylinder
the factory five cobra kit car guys like to use the same mustang hydroboost i did
found this remote reservoir on the ff forum, it is off a nissan quest/mercury villager mini van the adapters plug right into the mc
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#23 |
Registered User
Join Date: Oct 2010
Location: Where Mountaineers are free
Posts: 404
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Re: Under cab or firewall mounted master cylinder
I have noticed in the pics that there are no proportioning valves in these setups. Isn't that needed?
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#24 |
Registered User
Join Date: Aug 2011
Location: Tucson, AZ
Posts: 917
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Re: Under cab or firewall mounted master cylinder
Black Sheep's photo shows one. I used the same one mounted a little farther back. I don't know how much they are "really needed" but I plumb one using the philosophy "better to have and not need....." I have never moved one off zero on either build and had it make any difference. That's just me.
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#25 |
Registered User
Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: Under cab or firewall mounted master cylinder
i use the stock mustang valve that came with the mc
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