Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 10-12-2009, 04:40 PM
dusterbd's Avatar
dusterbd dusterbd is offline
Inactive User
 
Join Date: Feb 2001
Location: ablemarle, nc
Age: 42
Posts: 938
Default manual to power brakes

im thinking of swapping my 70 duster out to power brakes. ive already done the 11.75 front rotor swap with slider calipers, and 11X3 rear drums. it stops pretty well, just requires a bunch of pedal pressure. my knees arent getting any better, and its just not that fun to drive the manuals.

couple of questions.
1. how much vaccum do i need to properly run the system?
2. what year model boosters are the best?
3. will my current master cyl work?
4. do i need to locate a differnt brake pedal assembly for power due to stroke differences?
5. will my 2 year ols stainless lines be reusable?
6. any parts i cant think of needed?

thanks for any help you can gove me.
michael
__________________
Reply With Quote
  #2  
Old 10-13-2009, 12:09 AM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

there are some newer high performance master cylinders that may make your braking easier. Hate to see you add 50+ pounds to the car, and rob engine power to boot. May be worth looking into.
Reply With Quote
  #3  
Old 10-13-2009, 02:33 PM
sbknut's Avatar
sbknut sbknut is offline
Inactive User
 
Join Date: Aug 2003
Location: Yakima,Wa.
Posts: 93
Default

The 360 may not develope enough vacuum to operate a brake booster. I suggest a master cylinder from a 75 dart with manual disc brakes. It worked for me.
Reply With Quote
  #4  
Old 10-13-2009, 02:45 PM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

A simple vacuum canister can help significantly. I have a fairly radical solid roller cam that makes 10 inches vacuum at idle in gear, yet a simple $100 vacuum canister from Summit made my power brakes work fine.
Reply With Quote
  #5  
Old 10-13-2009, 10:32 PM
dusterbd's Avatar
dusterbd dusterbd is offline
Inactive User
 
Join Date: Feb 2001
Location: ablemarle, nc
Age: 42
Posts: 938
Default

ok, what is the minimum vacuum needed for proper operation?

also, a different master was mentioned. what one?
Reply With Quote
  #6  
Old 10-13-2009, 10:56 PM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

Quote:
Originally Posted by dusterbd View Post
ok, what is the minimum vacuum needed for proper operation?

also, a different master was mentioned. what one?
As I mentioned, my power brakes worked with a cam that gave 10 inches of vacuum at idle. I doubt most street driven cars would be that low. So, if a car has 10 inches of vacuum or more, then there is a good chance a vacuum canister will make power brakes functional. In Summit, there are lightweight master cylinders with varying plunger diameters, which will give
different pedal pressure for manual brakes. I'd call one of the techs at a brake company.

These are things to consider before going through the expense of adding power brakes, which rob power, can interfer with headers, etc, and add 50+ pounds to an engine.
Reply With Quote
  #7  
Old 10-14-2009, 04:09 AM
cageman's Avatar
cageman cageman is offline
Inactive User
 
Join Date: Dec 1999
Location: Bismarck ND
Age: 46
Posts: 5,544
Default

My power wagon hardly has any vacuum at all, and it has great power assist.
I would bolt the master on and then see, might be all you need
Reply With Quote
  #8  
Old 10-14-2009, 12:33 PM
aarracer aarracer is offline
Inactive User
 
Join Date: Mar 2007
Location: British Columbia
Posts: 891
Default

I have 4.5 inches of vaccuum at idle in gear at 700 rpm, and have no issues with my power brakes.
Reply With Quote
  #9  
Old 10-14-2009, 01:39 PM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

One problem with power brakes and low vacuum, is that you may only be good for one hard brake, then if you have to brake hard again immediately, you don't have brakes. That happened to me once!
Reply With Quote
  #10  
Old 10-14-2009, 04:04 PM
aarracer aarracer is offline
Inactive User
 
Join Date: Mar 2007
Location: British Columbia
Posts: 891
Default going coastal

Quote:
Originally Posted by cudabob496 View Post
One problem with power brakes and low vacuum, is that you may only be good for one hard brake, then if you have to brake hard again immediately, you don't have brakes. That happened to me once!
Bob

I've never had ANY such issues with mine! I live just north of you (on the big island)and most driving is coastal roads. (get the picture)
Reply With Quote
  #11  
Old 10-14-2009, 06:23 PM
cudabob496 cudabob496 is offline
Inactive User
 
Join Date: May 2007
Location: Richland, WA
Age: 71
Posts: 2,018
Default

Quote:
Originally Posted by aarracer View Post
Bob

I've never had ANY such issues with mine! I live just north of you (on the big island)and most driving is coastal roads. (get the picture)

Before I put on the vacuum canister, I was at a stop light, and took off pretty fast. All of a sudden I was on a turn, and hit the brakes pretty hard, I then let up, but had to hit them again in about 2 seconds, and there was almost no brakes there! Apparently what vacuum I had initally was used up in the first braking episode. Keep in mind when I punched it off the line, the vacuum goes to about zero, and was also pretty low while idling. So, it could be shakey if one has to pump the brakes to slow down (like if you were trying to stop on ice or snow), and has a low vacuum motor and power brakes.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
power to manual brakes SuperB70 Performance Talk 4 10-15-2006 11:36 PM
Manual to Power Brakes? rpmopar Performance Talk 18 10-18-2005 08:39 AM
Power Vs manual brakes TrxR Performance Talk 9 01-14-2004 04:29 PM
power to manual brakes? 6 packin Performance Talk 3 01-07-2003 07:14 PM
Manual or Power Brakes kekoakeakane Performance Talk 15 06-30-2001 03:29 PM




All times are GMT -4. The time now is 04:09 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .