replacing Master cylinder help

bigvino · Aug 11, 2011

hey everyone im have a new 93 Cobra M/C and im having difficulty removing the old M/C.. it doesnt want to pry off from the Brake Booster.. any suggestions? i have the brake lines removed from the old M/C.. thanks1

Rick 91GT · Aug 11, 2011

you took both nuts off along with the lines, try tapping it with a rubber hammer

bigvino · Aug 11, 2011

Yea the nuts are off,,but the m/c doesnt come off... Feels like its sealed to the booster..

Mustang5L5 · Aug 11, 2011

All that holds it on are the two nuts. Take them off and it should come. Spray some penetrating lube in the studs and tap the end woth a rubber Mallet.

Was the rest leaking? If so, it probably corroded itself to the booster and the booster should prob be replaces as well as brake fluid eats the rubber inside

TenorPlayinGuy · Aug 11, 2011

agreed^

bigvino · Aug 11, 2011

no i didnt notice any leaking.. but the paint on the booster was flaking and coming off..

Mustang5L5 · Aug 11, 2011

Usually happens due to brake fluid leaks....common for The mcs to leak from the bore onto the booster. You'll see a "trail" of peeling paint under the mc leading downwards

bigvino · Aug 13, 2011

yup! i looks like im going to have to replace the brake booster as well.. which one Brake Booster should i get? here is my set up:

Front calipers > 01 GT PBR's
Rear calipers > 97 V6,GT mustang
M/C > 93 Cobra 1"

Thanks everyone!

Bryan83taco · Aug 13, 2011

Excuse my ignorance but why are you replacing the booster now? I don't think some brake fluid can destroy a booster. I'm in the middle of my MC upgrade as well. Pry off the MC and slap on the Cobra one.

Lots of people on here get away with using the stock booster and a cobra or 94/95 MC. I'm hoping I fall into the same boat. Let me know how it works out for you.

bigvino · Aug 13, 2011

thats the problem i have.. the booster and the M/C dont want to separate.

93project · Aug 13, 2011

I'm also in this situation. 02 PBR, rear ranger drums. and im buying a 95 new MC. What are u doing about the proportioning valve? Mine started leaking bad yesterday. I just noticed today.....
Anyone ditch the stock valve for a new setup?

bigvino · Aug 13, 2011

are you going to replace the rear drums for disc?

93project · Aug 13, 2011

No. I have new ranger drums, shoes and hardware installed. The brakes never felt good. Soft pedal, and with the valve leak, I know why its stopped worse than it used to 4 lug. I'm just needing to know what to do to delete the valve.... I'm gonna get the new 95 MC, new fox booster. Can I just use a baer proportioning valve to ditch the stock one?

Bryan83taco · Aug 13, 2011

Oh I see. Let some penetrating fluid get there then pound on it with a rubber mallet. Also a few good wacks with screw driver/pry bar may do the trick. I would keep at it because I've heard getting a SN95 booster in the there even more of a pain in the ass. They are a little bit bigger.

Bryan83taco · Aug 13, 2011

93project

I'm pretty sure you are supposed to keep the stock proportioning valve when you keep the drum rear brakes. From I've read during my 5 lug/rear disc swap, the adjustable proportioning valve is only needed when you do a disc rear swap.

Do some research on the ranger drum conversion.

bigvino · Aug 13, 2011

should i get the sn95 bosster or the brake booster from a 87-93???

93project · Aug 14, 2011

I've heard that modifications are needed to fit SN booster....
I researched the drum set up and here's what I found...
I can use a T fitting for the front PBR caliper lines and an aftermarket proportioning valve for the rear. This works
because I have "mismatched" front and rears.. the 95 master cylinder will provide enough fluid push for
The larger calipers, and a firmer pedal

Bryan83taco · Aug 14, 2011

93project said:
I've heard that modifications are needed to fit SN booster....
I researched the drum set up and here's what I found...
I can use a T fitting for the front PBR caliper lines and an aftermarket proportioning valve for the rear. This works
because I have "mismatched" front and rears.. the 95 master cylinder will provide enough fluid push for
The larger calipers, and a firmer pedal

Don't forget about your 3-2 port conversion if your going to a sn95 MC. MM sells a good kit so you wont have to flare any brake lines.

bigvino · Aug 15, 2011

but i have a M/C from a 93 Cobra...should i get a booster from a SN95 or a 87-93?

Stroked N Blown · Aug 15, 2011

Im surprised that one the experts have not chimed in. lets have more opinions on this. the guy is stuck.

replacing Master cylinder help

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