Is my Master Cylinder bad?

SuperStang83

Founding Member

Mar 21, 2001

1,693

0

49

Boyertown, Pa

Jul 26, 2009

#1

• Jul 26, 2009

• #1

Just recently my brakes have started to act up. I can push in the brake pedal and for about the first 2 inches it feels normal, but then it gets real stiff and it is tough to stop the car. I bled the brakes and topped off the fluid, took it for a spin and I can't even lock up the tires and it is raining! The car stops, but it takes a while longer than it should.

I have PBR calipers up front with ceramic pads and everything from the rear is from a 96' Mustang. I also have a '93 Cobra Master cylinder and a MM proportioning valve. Do you guys think it is the MC or is something else going on here?


Jacob

 

J

Jack's95gt

Member

Aug 15, 2004

443

1

18

Huntingdon Valley, PA

Jul 26, 2009

#2

• Jul 26, 2009

• #2

When my master cylinder went bad, the brake pedal went to the floor and I had no brakes. I had no leaks and the reservoir was full. I replaced the cylinder and they worked great afterwards.

 

trbkrb

Founding Member

Jun 4, 2001

1,976

4

39

Houston, TX

Jul 26, 2009

#3

• Jul 26, 2009

• #3

What booster do you have? Usually a hard pedal is from not having enough boost. A bad MC usually you have to pump it up to get stopping power since it goes to the floor easily, or the pedal stops, and then continues to drop as you hold your foot on the pedal. This is a result of the internal seals going bad.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,249

17,934

224

Massachusetts

Jul 26, 2009

#4

• Jul 26, 2009

• #4

I'm guessing booster based on what i read. Chekc your lines and 1-way check valve and make sure you don't have a vac leak.

 

Maryland Stang

Active Member

Aug 21, 2002

1,656

30

39

Greenville, NC

Jul 27, 2009

#5

• Jul 27, 2009

• #5

Every MC I've seen go bad leaked at the back of the MC.

 

1

1fast5.o

New Member

Jul 26, 2009

2

0

0

Jul 27, 2009

#6

• Jul 27, 2009

• #6

you did not get air in the system well you bleed the brakes right? you checked it to make sure that the fuled didnt go out at the time of bleeding the brakes?

 

SuperStang83

Founding Member

Mar 21, 2001

1,693

0

49

Boyertown, Pa

Jul 27, 2009

#7

• Jul 27, 2009

• #7

It may be the booster because it feels like I am driving a car with manual brakes lately. Does that sound about right. Good suggestion 5L5, I overlooked the booster. I think I have the booster from a 93 Cobra, but will have to check with old_blue to make sure.


Jacob