Brakes Master cylinder reservoir leak

flashback87

Member
May 18, 2010
338
2
19
Cleveland, OH
My brakes aren't the greatest so I've been looking into them and doing some research. About 1-2 times a year I have to add a little brake fluid to the reservoir. So I started looking around the master cylinder and noticed what looks like some fluid build up/residue where the mc connects to the booster.

I've also notice the reservoir attached to the mc is kind of loose and wiggles a little. Is this normal? I'm thinking this is causing the leak because the rear of the mc by the booster under the reservoir is a little damp.

Could this be causing my poor pedal pressure? Do I need a new mc or is there a way I can reattach the reservoir to make it seal better?

Dont know if this is related to but there is a pretty loud air sound when I push the brake pedal.

I also attached a pic of the residue where the mc attaches to the booster.

Thanks!
 

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Mustang5L5

Mod Dude
Feb 18, 2001
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Massachusetts
Agree. MC rod seal is probably leaking. When they leak, the rubber destroys the booster.

If you look under the MC there's probably s little rusted, bubbled trail leading down.

Replace both
 
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flashback87

Member
May 18, 2010
338
2
19
Cleveland, OH
Thanks! I'll move forward with both.

Are the typical car parts stores replacement mc and boosters acceptable?

I just have the stock discs in front and drums in rear.