Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1864746
07/05/15 11:37 PM
07/05/15 11:37 PM
|
Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
On my 72 challenger I am switching to manual brakes. I have the stiffening plate and master cylinder and adjustable pushrod. My question is, what part under the dash does the pushrod go? Directly on the pedal? It has a "z" bar type linkage under it now. Am I to do away with that linkage? I have the Mancini pushrod setup. Thanks for any help Yes, dump the Z bar linkage and go directly to the pedal arm with your push rod. On my car I used 2" ( pedal pivot point to pushrod attachment ). I actually copied that measurement from a 65 manual brake Coronet. Worked pretty good on my 79 Chrysler Cordoba. Pedal pressure was up of course, but not bad at all. Used the same 1" bore master and all else stock brake system.
Fastest 300
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1864758
07/05/15 11:46 PM
07/05/15 11:46 PM
|
Joined: Jul 2013
Posts: 1,272 Northern Calyfornua
Sxrxrnr
pro stock
|
pro stock
Joined: Jul 2013
Posts: 1,272
Northern Calyfornua
|
Well advised to obtain the smallest master cylinder bore that you can find, particularly if front disc brakes. My 70 Challenger had horrible front brake performance,,,non power brake,,,after switching to disc brakes and retaining drum brake mc.
Installed 15/16th mc found on Amazon for 50 bucks. All is well now. Also installed much cleaner, less noise, ceramic disc pads.
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1864827
07/06/15 01:11 AM
07/06/15 01:11 AM
|
Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
I have the 15/16 m/c. I hope it works good. Thank you guys for the help! Should work fine.
Fastest 300
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1865198
07/06/15 04:35 PM
07/06/15 04:35 PM
|
Joined: Jan 2003
Posts: 25,729 Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,729
Rio Linda, CA
|
Expect longer pedal travel and (possibly) a softer pedal.
The INTERNET, the MISinformation superhighway
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1865574
07/07/15 12:24 AM
07/07/15 12:24 AM
|
Joined: Oct 2005
Posts: 8,853 Ontario, Canada
Stanton
Don't question me!
|
Don't question me!
Joined: Oct 2005
Posts: 8,853
Ontario, Canada
|
Expect longer pedal travel and (possibly) a softer pedal. This is correct. The smaller the m/c bore the more the pedal has to travel BUT the less effort it will take. Larger bore will take less travel but more effort. Think about it for a minute!
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1865635
07/07/15 02:23 AM
07/07/15 02:23 AM
|
Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
Expect longer pedal travel and (possibly) a softer pedal. I have disc brakes up front. I was told the opposite of what you are telling me with the 15/16 mc. I run disc / drum on my Cordoba, and I'm sure my brakes are considerably bigger than yours ( both in size and fluid capacity ). I have no problem with 1" master bore. Minimal pedal travel and rock hard after pad / shoe contact. Just make sure the rest of your brake system is up to snuff.
Fastest 300
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Crizila]
#1865907
07/07/15 03:27 PM
07/07/15 03:27 PM
|
Joined: Jan 2003
Posts: 25,729 Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,729
Rio Linda, CA
|
Pedal ratio has a great influence on both pressure and travel.
Some cars have different brake pedals for power/manual with different pedal ratios and direct links to the MC while others use the same pedal and depend on linkage to reduce the pedal ratio for PB.
The INTERNET, the MISinformation superhighway
|
|
|
Re: Need help! Power to manual brake swap.
[Re: John_Kunkel]
#1865960
07/07/15 05:12 PM
07/07/15 05:12 PM
|
Joined: Oct 2005
Posts: 8,853 Ontario, Canada
Stanton
Don't question me!
|
Don't question me!
Joined: Oct 2005
Posts: 8,853
Ontario, Canada
|
Some cars have different brake pedals for power/manual with different pedal ratios and direct links to the MC while others use the same pedal and depend on linkage to reduce the pedal ratio for PB. That's what the Z-bar assembly does - which he's discarding. The Z linkage reduces the pedal travel but increases the pushrod travel. This would usually result in a very stiff pedal but because of the booster it takes very little pedal effort. That's also why it takes so much effort to stop a power brake a car when the engine dies!
|
|
|
Re: Need help! Power to manual brake swap.
[Re: Uncle Barry]
#1865972
07/07/15 05:41 PM
07/07/15 05:41 PM
|
Joined: Jan 2007
Posts: 685 pennsylvania
poboyengineering
mopar
|
mopar
Joined: Jan 2007
Posts: 685
pennsylvania
|
Not to hijack, but what is the go-to M/C? I'm looking for an OEM type, disc/drum, using the usual parts: adapter plate, MP adjustable pushrod, OE pedal in a Dakota....
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
|
|
|
|
|