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Hydraulic brake booster...
https://www.slantsix.org/forum/viewtopic.php?t=23276		 Page 1 of 1
Author:  Jopapa [ Mon May 21, 2007 2:36 pm ]
Post subject:  Hydraulic brake booster...
I'm planning on converting my power steering to a manual box (not sure which ratio I'll go with yet. Still reading up on it). But while looking at my power steering pump a few days ago, I was thinking; instead of eliminating the pump, why not still get some use out of it and use it as a pressure source for a hydroboost brake setup? I'd be surprised if there isn't a Dodge/Chrysler unit that wouldn't bolt right in in place of the vacuum booster. I've driven alot of vehicles with hydroboost brakes and I LOVE the feel at the pedal. Nice and smooth, very little effort, and when everything's set up right, it'll stop on a dime.

Any thoughts or opinions?
Author:  SlantSixDan [ Mon May 21, 2007 5:24 pm ]
Post subject:  Re: Hydraulic brake booster...
Quote:
I'm planning on converting my power steering to a manual box (not sure which ratio I'll go with yet. Still reading up on it).
Get the 20:1.
Quote:
But while looking at my power steering pump a few days ago, I was thinking; instead of eliminating the pump, why not still get some use out of it and use it as a pressure source for a hydroboost brake setup?
Arrrrgh...hydroboost. The concept fits into the "marginally idiotic" category. Most implementations fit into the "collossal pile of horse poo" category. Do as Nancy Reagan told you in the 1980s: JUST SAY NO!
Quote:
I LOVE the feel at the pedal. Nice and smooth
"Nice and smooth" can be your mantra when you're (back) under the hood (again) fixing (more) leaks (again) and troubleshooting (more) problems (again). Hydroboost also adds a great deal of weight and takes up a great deal of space under the hood.
Quote:
when everything's set up right, it'll stop on a dime
The presence/absence of brake boost, and the nature of the booster system, does not determine how quickly the car will stop, unless pedal force is the limiting factor, and while I've never seen a picture of you, I don't imagine you look much like anybody's little old grandmama.
Quote:
Any thoughts or opinions?
I have no opinion on the matter. ;-) But if I did, my preference would be for unboosted brakes (disc front, drum rear) with the master cylinder bore, rear wheel cylinder bore, and pad compound thoughtfully selected to provide excellent braking with progressive pedal feel and reasonable effort. But as I say, I have no opinion on the matter.
Author:  65 dartman [ Mon May 21, 2007 6:28 pm ]
Post subject:  Re: Hydraulic brake booster...
Quote:
I have no opinion on the matter. ;-) But if I did, my preference would be for unboosted brakes (disc front, drum rear) with the master cylinder bore, rear wheel cylinder bore, and pad compound thoughtfully selected to provide excellent braking with progressive pedal feel and reasonable effort. But as I say, I have no opinion on the matter.
If you had an opinion on this (which I can plainly see you don't :D), how would you set up a 65 Valiant with KH's for the discs, master cylinder bore, 10 inch rear cylinder bore NOS brake pads and unboosted. How about for a Dart same set-up but boosted?
Author:  SlantSixDan [ Mon May 21, 2007 6:43 pm ]
Post subject:  Re: Hydraulic brake booster...
Quote:
how would you set up a 65 Valiant with KH's for the discs, master cylinder bore, 10 inch rear cylinder bore NOS brake pads and unboosted.
Same way I had my own '65 set up.

1"-bore master cylinder
genuine Chrysler front pads
13/16" bore rear wheel cylinders in the 10" drum brakes

Result was durn near perfection. Easy, progressive pedal, no premature lockup at either end.
Quote:
How about for a Dart same set-up but boosted?
Delete booster then see above :-)
Author:  Jopapa [ Mon May 21, 2007 6:57 pm ]
Post subject:  Re: Hydraulic brake booster...
Quote:
Get the 20:1.
That's what I was leaning towards. Think I'd be better off getting a new gearbox with the 20:1 ratio, or getting a junkyard unit and a 20:1 rebuild kit?
Quote:
Arrrrgh...hydroboost. The concept fits into the "marginally idiotic" category. Most implementations fit into the "collossal pile of horse poo" category. Do as Nancy Reagan told you in the 1980s: JUST SAY NO!
I've seen some that had minor leaks, but the majority I've seen set up on 4x4 trucks worked great and didn't leak at all. As far as the size and weight issue, I agree on weight (got a GM unit sitting in my storage unit waiting to be installed on my Toyota), but for size, it (again, the GM unit) is actually smaller than the vacuum booster currently installed in my Duster.
Quote:
The presence/absence of brake boost, and the nature of the booster system, does not determine how quickly the car will stop, unless pedal force is the limiting factor, and while I've never seen a picture of you, I don't imagine you look much like anybody's little old grandmama.
No, that I definately don't, but I do have a bad knee, which is one of the biggest factors for me wanting a well boosted brake system. Braking an unboosted system when my knee is hurting is damn near impossible for me, and the booster in my Duster (which I do think may be bad anyway) isn't a whole lot of help.
Author:  slantzilla [ Mon May 21, 2007 7:40 pm ]
Post subject: 
When I was at the race car shop I installed a hydro-boost kit on a big block Chevelle with Wilwood discs. The owner was a big guy and he could not get the car to stop well enough for his taste. After we added the booster the thing was like a completely different car. I don't remember the name of the company we got the kit from, but it was a very complete kit and installation was moderately easy. :shock:

I personally don't care for power steering or brakes, but this kit worked very well. :D
Author:  Slanted Opinion [ Tue May 22, 2007 4:26 am ]
Post subject: 
If I may, I'd like to jump in to ask a quick question:

I'm about to dismantle a '73 Valiant with a power disc brake setup to transfer into my '68 Dart with manual 9" drums.

Can I simply use the '73 master cylinder without the power booster assembly? Or is there a different P/N or configuration of master cylinder for this purpose?

I'd like to skip the weight of the power booster.

Thanks - Mac
Author:  SlantSixDan [ Tue May 22, 2007 9:11 am ]
Post subject: 
Some of the masters used w/power don't have the rear piston provisions for the pushrod retainer bushing, so if yours hasn't got that, you'd want to use one that does. Also, the master cylinder bore is different with power vs. nonpower. You can use either for nonpower; the 15/16" unit will give an easier pedal with longer throw, and the 1-1/32" unit will give a harder pedal with shorter throw.
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