Did anyone notice the brake switch in Chaplin's pictures is mounted 180 degrees out?  Notice one of the connection tabs is touching the brake pedal.  The switch needs to mounted so the connection tabs are pointing away from the pedal. 

Call Bruce Couture at Modern Driveline, THE premier experts in 5/6 speed transmissions and classic car conversions.  www.moderndriveline.com .  Full disclosure: Bruce is a good friend. I have no financial association with Modern Driveline.

[color=rgba(0, 0, 0, 0.870588)]Thanks for the advice. I really do appreciate it. So, I realized the info I gave was partially incorrect. Sorry for that.[/color]

I'm using a Versailles brake distribution block which I believe has has a built in rear proportioning valve. It is not adjustable. I ran it previously without issue, so I don't think this is causing my sensitive pedal condition. It was designed by Ford for 4 wheel disc, on the Versailles of course. Also, I don't see where a prop valve would solve my sensitive pedal. Prop valves change the ratio of pressure between front and rear systems, but they don't reduce overall brake system pressure as seen out of the MC.

[color=rgba(0, 0, 0, 0.870588)]I'm using a power brake pedal. It is the correct ratio. Good call out though.[/color]

[color=rgba(0, 0, 0, 0.870588)]The booster is a GPS 8" dual diaphragm unit, not a 9". It is brand new. It replaced a factory 7.5" dual diaphragm unit. The GPS is .5" larger, but I would be surprised if that would make such a significant difference in pedal feel/force. That said, the sensitive pedal showed up along with the new booster. Perhaps the internal valve is bad? I'll call GPS to discuss.[/color]

[color=rgba(0, 0, 0, 0.870588)]So, would switching from a 1 1/16" bore MC to a 1.0" bore MC bring more pedal travel and require more foot force? If so, that's what I'm looking for. Should I switch to a 1" bore MC?[/color]

* 67 Mustang
* Versailles disc rear, all factory parts.  E-brake IS adjusted properly. No "blue" rotors.  Wheel rotates without drag.
* '70 Mustang disc brakes up front.
* Dual diaphragm 9" booster.
*  1 1/16" MC (1998 Windstar)

Pedal is way too sensitive. Brakes work too good.  Pedal travels about 1.5" to no more than 2" and takes almost no foot pressure. Can lock up brakes way too easy.  Dangerous, actually.

A smaller bore MC would bring more pedal travel but higher pressure, correct?

What's the fix?

 

This is a comparison of an Explorer MC (very similar to the Mustang V6 MC) next to a Windstar MC.




Anyone know what the measurement is of the Windstar MC mounting flange holes, C/L to C/L?  And what's the stock Mustang MC measurement?  Are they different?

commish10 wrote:

Using 8' dual diaphram booster...[edited]
 

Whate make and model 8" dual diaphragm booster are you using?

Sound deadning a vehicle is so misunderstood.  There's a lot to it, to do it correctly.  A rattle can helps, but does not compare to a properly installed sound deading system.
To do sound deadinging correctly you need three layers of material; sporradically placed CLD tiles to dampen vibration (doing the whole floor with stick-on is a waste of material and $$ but the manufactureres won't tell you this) + closed cell foam of about 1/8" thickness + toping of MLV.  Educate yourself here: http://www.sounddeadenershowdown.com/home
 

MustangSteve wrote:

I am using the 92 Ranger MC on my 66 with four wheel Cobra discs.  Works great and has 1" bore with ports on driver side.  It is not a true four wheel disc master cylinder, though.  Not sure of the exact internal differences.

Anyone know if the '92 Ranger MC has residual valve(s)?  That's one key difference between drum and disc MC (besides bore and stroke of course).  Usually the residual valve can be unscrewed out of the MC connection port, thus making a drum port useable for disc, assuming bore and stroke are correct.

MustangSteve wrote:

67StangMan wrote:

MustangSteve wrote:

That Windstar unit would be great to use if you were using the 5.0 Fox booster or 67-70 Midland or Bendix booster because those boosters have dual diaphragms and apply more force to the MC.

The Midland 67-70 booster is a single diaphragm unit. They were not offered in dual diaphragm.  I know...I'm considering switching from my single diaphram 1967 Midland to a dual diaphragm unit.

 

The thicker Midland and Bendix boosters are dual diaphragm according to all published specs.  Typically the shape of a dual diaphragm booster is the longer, smaller diameter like those two. The thinner boosters are single.  I have not disassembled one to check, but I have heard "dual diaphragm" on these for many years of dealing with Mustangs.  You said you know they are single.  Educate me, please.
 

I have a diagam of the Midland single diaphragm '67-'70 Mustang booster and will scan and post here shortly.
My Midland booster is single diaphragm and is exactly 7" in diameter.  It is 6" from firewall mounting surface to MC mounting surface (inclusing the spacer/breather thingy). What other diameter sizes were offered for the '67 - '70 Mustang Midland boosters? Perhaps a larger diameter, dual diaphragm booster was available as an option? I haven't seen one but would like to.
 

MustangSteve wrote:

That Windstar unit would be great to use if you were using the 5.0 Fox booster or 67-70 Midland or Bendix booster because those boosters have dual diaphragms and apply more force to the MC.

The Midland 67-70 booster is a single diaphragm unit. They were not offered in dual diaphragm.  I know...I'm considering switching from my single diaphram 1967 Midland to a dual diaphragm unit.

The 1996 Winstar MC is in fact 1 1/16" bore (1.0625).  I've been running one for years and measured it myself when I inspected it prior to use.

I'm considering a 1 1/8" bore MC for my 4 wheel disc setup. Need one with ports opposite engine side and no residual valves.  And I prefer a reasonably priced Ford unit, but I might consider the C3 Vette MC if I have to. Any recommendations?

 

Well,  I found out that the star shaped part is called a Reaction Valve.  It helps provide smooth operation of the booster.  It is required.  I ordered a Reaction Valve from HarmonClassicBrakes.com .

I also learned that the Midland booster spacer is required as well.  The Midland booster needs to release air through this spacer/breather to allow the diaphragm to move freely.

Yes Steve, the reason I asked about possible deleting the spacer/breather is to gain MC to shock tower space.  I am currently running a Midland '67 booster and a 1996 Windstar MC. The MC is about 1/8" from the tower and is showing slight scratch marks on the shock tower.  This means that the car is flexing slightly and allowng the MC to tough the tower.  I need to resolve this problem.  I'll start a new post with a question about this. Thanks! Brian

Need to get to Woodward one day!