The Stovebolt Site Forums The Shop Area The HiPo Shop power brakes booster location

I have a 50 1/2 ton chevy pickup with GM front disk brakes and a saginaw 4 speed. There looks like a clearence problem for a power booster that is positioned behind the master cylinder. Any suggestions on alternatives?

I took the easy way out and bought the under floor unit from Chevy Duty.A little bit pricey,but a very easy install.

I didn't think you could use a power booster in that location with a manual transmision???

Use a Hydroboost, as long as you have a power steering pump.

I do not have a power steering pump, but does anyone know for sure whether you can use an under floor brake booster kit with a manual transmission?

I did but it's in my 1 1/2 ton truck. It's a booster and master from a 70 C10 and a homemade bracket to mount it to the frame. It fits under the floor even with the dual exhaust,
Scott

CPP Firewall mount is working for me.
http://www.chuckthetruck.com/page5.html

http://www.classicperform.com/4754chevtrk.html

Dont know for sure about the manual trans.Why dont you check with Chevy Duty?

They do make 7 inch diameter dual diaphram power boosters. It may fit your application.

Why does it matter if it's a manual trans. or not? Mine even has a PTO on it and has plenty of room for a full size booster and a dual res. master,
Scott

The three speed on the column or a car 4-speed has shifter rods and a clutch z-bar intruding into the space next to the transmission - that is most likely why the space is tight.

That's the area where my PTO and left side exhaust pipe reside with no interference problems. Actually, I just took the booster/master down erlier this summer without even taking down the pipe.
Scott

Consider running a Manual master cylinder?
Lots of GM vehicles came with non-power disc brakes.
I inquired here on the 'bolt and heard from several people who run that way, and stop just fine.

I'm planning to go that route, but will be a while before I'm back on the road....

Cheers,
mark.
'51 KY 3100

I did what dale937 did but waited till they went on sale. It all fits nicely under the floor. I have a T5 tranny sitting right next to it coming off a 292 & bellhousing. This done in a 51 3100. The clutch linkage is the tuff part right now but we'll figured that out. But yes a T5 and a power booster fit and the new electronic speedo drive fits also.

Hey Coupe, I spoke w/CCP when Ipurchased my under the floor unit and was told that the power booster (mini or whatever) will not work because of the spacing problem with the floor clutch pedal. They gave me 2 ways to go 1 which I chose , keep my original pedal and just install the dual cylinder with disk brake on front rear drums and lot better brakes than original! duh... or 2 put ir on the firewall.a no brainer for me. also dont forget your 2# and 10# valves if u decide to go that way.Look here. www.classicperform.com Good luck. Mike

UPDATE:
The set up is:
installed in a 1951 3100, a 292, a T5, a cast iron bellhousing and stock truck straight clutch fork (for that 292 motor) and a new under floor mounted power master cylinder.
the problem:
The straight clutch fork fouls the master cylinder when it moves back during operation.
The solution:
So far and this may be updated again but...
seems to be the use of an early corvette clutch arm 1956-1962. This vette arm after it comes out of the rubber boot bends forward quit a bit and has a hole for a clevis or heim joynt fitting (for adjustment) and should clear the new power master cylinder. Later camaro, el caminos and chevelle fork arms are too wide to fit the slot in the cast iron bellhousing, do not bend forward enough and must be modified for adjustment cause they are hydraulic model arms w/ a dimple @ the end location. Too much work to redo/modify those arms. I had to made a special double heim joynt clutch adjuster.
I hope this helps you gentlemen who tackle this arrangement.
More later after the tranny is pulled and the set up completed to see if what I said I works.
I can reach the brake fluid resivoir from the square cab floor panel as I welded up the stock brake filler hole.

verrry interesting discussion. I've got a 327 with m21 4 speed in my '49 1/2 ton with power brake master cylinder and booster under the floor. Got the braket kit from R.B's and it works great. The only interferance is where the speedo cable hooks to the trans. The cable is too close to the booster and rubs on it. An adapter cured that problem.

I have a bellhousing and clutch fork in my 64 that originally came from a 78 3/4 ton. It has a fork that has two usable spots to insert the clutch rod coming from the bellcrank. Could that be of use to make clearance? Use the inner most slot for your linkage and cut the excess off. I'm using the inner on my truck anyway because I like the pedal travel in that position better. Just a thought for future mod's,
Scott

Try calling The Right Stuff in Sunbury Oh. They might make an offset master cylinder bracket. 1/800-405-2000

Here's an alternate solution for the t-5/SM clutch arm fouling the mastercylinder:

How 'bout a hydraulic throw out bearing and 3/4" master cylinder for it?

I've got the CPP booster/bracket/master kit and am mounting the clutch master cylinder so that the resevoir lines up with the original brake master cylinder inspection hole.

The master cylinder is a Wilwood and the Hydraulic Throw Out Bearing (TOB) is made by Howe Racing and bought from speedway.

When I put in the CPP bracket I had to space it out from the original mount. Instead of using washers I'm using a piece of steel and welding the clutch master cylinder mount bracket to it. Will post some pictures after new years.