Need to decrease my brake power...

MikeC

Founding Member

Aug 1, 2002

240

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16

SLC, UT

Dec 9, 2008

#1

• Dec 9, 2008

• #1

I have a pieced together M2300K kit on my 92 (Cobra brakes ft and rear). I have a 93 Cobra MC and booster. The brakes have too much power, very little pedal pressure is required to stop the car. I lightly touch the brakes and it stops. I don't want to change the booster to a smaller one because of the effort it took to get the 93 Cobra booster in the car in the first place. So I'm thinking a smaller diameter master cylinder may help. This should reduce the pressure and increase the travel a little. Is this correct? Any suggestion as to which MC is smaller in diamter? I believe the 93 Cobra MC is 1" diameter, do any others have 7/8" or 15/16" bore and the same fitting sizes at the 93 Cobra?

 

D

Deleted member 87397

Dec 9, 2008

#2

• Dec 9, 2008

• #2

Did you happen to get the adjustable proportioning valve that comes with the 2300 kit? Sounds like maybe you just need to tweak that a bit and if you don't have one you might want to put one in and see if you transfer a bit more to the rear instead of the front.

 

MikeC

Founding Member

Aug 1, 2002

240

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16

SLC, UT

Dec 9, 2008

#3

• Dec 9, 2008

• #3

I have the adjustable proportioning valve and have gutted the stock valve. I originally used the 93 Cobra MC with the stock booster and it was under powered so I put on the 93 Cobra booster and now it is overpowered. I believe the adjustable PV is set correctly. The rear locks up just after the front.

 

6

63bird390

New Member

Nov 24, 2008

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0

San Antonio TX

Dec 10, 2008

#4

• Dec 10, 2008

• #4

master cyl

for a harder pedal you need a bigger dia master cyl mabey 1 1/8" this link will have a crap load on brake info.


Master Power Brakes - Reference/FAQs: Master Cylinders

 

MikeC

Founding Member

Aug 1, 2002

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16

SLC, UT

Dec 10, 2008

#5

• Dec 10, 2008

• #5

I guess I didn't explain what I want very well. I want to change it so I have to apply more pressure to stop the car. Right now the weight of my foot on the pedal stops the car. It is like it's over boosted. Sometimes I forget and apply "normal" pressure on the pedal and it almost locks the wheels up.

 

D

Deleted member 87397

Dec 10, 2008

#6

• Dec 10, 2008

• #6

I think 63bird is on the right track. A larger diameter is going to create less pressure and cause you to have to push the pedal harder. By hard pedal I think he meant having to push it harder.

 

67coupe

Founding Member

Apr 5, 2002

658

402

93

Huntsville, AL

Dec 11, 2008

#7

• Dec 11, 2008

• #7

MikeC,

I replied to your thread on corral as well.

Yes, increasing the MC bore will make your pedal less sensitive.

I know you don't if you want to, but putting the stock booster back in would also increase pedal effort. The whole cobra vs stock booster has been debated many times. I would suggest a search.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,169

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224

Massachusetts

Dec 11, 2008

#8

• Dec 11, 2008

• #8

I beleive 94-95 GT's use a 1 1/16" bore.

93 Cobras use a 1" bore

94-95 Cobras use a 15/16" bore.


Try swapping the cobra unit out for a 94-95 GT/V6 unit

 

MikeC

Founding Member

Aug 1, 2002

240

0

16

SLC, UT

Dec 11, 2008

#9

• Dec 11, 2008

• #9

67coupe said:

MikeC,

I replied to your thread on corral as well.

Yes, increasing the MC bore will make your pedal less sensitive.

I know you don't if you want to, but putting the stock booster back in would also increase pedal effort. The whole cobra vs stock booster has been debated many times. I would suggest a search.

Click to expand...

I used the stock booster with the 93 Cobra MC for several months. It was impossible to lock the wheels up. And I may never be able to get the 93 Cobra booster back out of the car, it did not want to go in there.

I think I may be stuck because it looks like I want to different things.

1 - I want to increase the pedal stroke - smaller bore MC to move less fluid.
2 - I want to make it less sensitive - larger bore to decrease fluid pressure.