Frame mounted brake booster
Thread Starter
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
Likes: 1
From: Scottsdale, AZ
Frame mounted brake booster
Can I mount my frame mounted booster and cylinder to the firewall with this bracket or do I need a different bracket? My cab is at body shop right now...
Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
Not only would you not use that bracket, but you would want to replace the booster as well. That booster is designed to be small in diameter to fit within the height of the frame rail...a firewall-mounted booster is usually much larger in diameter but shorter in depth so that it does not extend out into the engine compartment so far. If you are really interested in improving your braking system then look into a hydroboost and get rid of the vacuum system entirely.
Thread Starter
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
Likes: 1
From: Scottsdale, AZ
Because my tranny crossmember setup interferes with my brake booster barely. The bracket still fits but the booster rubs.
#2
Hydroboost would cost another $400-$$500 correct? Trying to keep cost down and use what I have.
#2
Hydroboost would cost another $400-$$500 correct? Trying to keep cost down and use what I have.
Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
It looks to me like you are suffering from a self-inflicted wound. How did you end up with all that tubing? There are many other ways to add a crossmember that do not involve so much metal...here is one that I fabricated for my truck:
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
Jrock, When installing a booster/mc on the firewall, The mounting bracket/firewall stiffener goes on the inside of the firewall and is usually part of the hanging pedal bracket.
Here I am building the pedal MC bracket for my hanging pedals. The bracket is sitting upside down, the portion on the top of the picture pointed up goes against the firewall, the MC bolts to the area with the 4 holes. The similar portion on the right mounts the clutch MC. Note the bracket extension between my arms that bolts to the bottom edge of the dash to stiffen the whole thing, you don't want any flexing of the firewall when you press the brake pedal.
You can use the booster you have. Yes the dual diaphragm booster does extend further from the firewall but it is much smaller in diameter compared to an 11" diameter single diaphragm. here is a pic of my dual diaphragm booster mounted to the firewall. Note the black piece is the clutch MC, a single diaphragm booster would have interfered with the clutch MC.
NOTE: I don't know what is the problem, but I can't add the second picture. It is the last picture in my "making changes" gallery. Don't click the link here, it just hangs and i can't delete the link.
Here I am building the pedal MC bracket for my hanging pedals. The bracket is sitting upside down, the portion on the top of the picture pointed up goes against the firewall, the MC bolts to the area with the 4 holes. The similar portion on the right mounts the clutch MC. Note the bracket extension between my arms that bolts to the bottom edge of the dash to stiffen the whole thing, you don't want any flexing of the firewall when you press the brake pedal.
You can use the booster you have. Yes the dual diaphragm booster does extend further from the firewall but it is much smaller in diameter compared to an 11" diameter single diaphragm. here is a pic of my dual diaphragm booster mounted to the firewall. Note the black piece is the clutch MC, a single diaphragm booster would have interfered with the clutch MC.
NOTE: I don't know what is the problem, but I can't add the second picture. It is the last picture in my "making changes" gallery. Don't click the link here, it just hangs and i can't delete the link.
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Thread Starter
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,257
Likes: 1
From: Scottsdale, AZ
More support and the tranny dog bone was my interest. It allows me to drop the tranny right out of the bottom of the truck. Could I use my master cylinder and get a used hydroboost somewhere cheap?
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Logistics Pro
Joined: Jun 2010
Posts: 4,965
Likes: 261
From: East KY
Do you have enough room on that "dog bone" to flip the mount around so that the buttress for the tranny points back instead of forward. That would get the mounting bolts out of the way. Your other option would be to weld the top half of that clamp and eliminate the bolt? Just a couple thoughts....
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
IMHO Jrock you are way overengineering your chassis. Charlie's tranny CM can be unbolted and the tranny dropped out the bottom as well and is far simpler. The tranny crossmember does not support a lot of weight, most of the weight is supported by the motor mounts, there is no more than 50 - 100# on the tranny mount.
Everyone's build is different is what I keep hearing On this website. Looks like hydroboost it is!!
Logistics Pro
Joined: Jun 2010
Posts: 4,965
Likes: 261
From: East KY
Well if I went as far as you have with that, I wouldn't let one single bolt make me totally re-engineer my brake system. Heck, if nothing else, I'd remove that bolt and/or sleeve if needed and put a plumbing clamp on it if nothing else.