Brakes Bad brake booster!

91GTstroked · May 12, 2020

Well,

Some have known that I been fighting some gremlins lately! I'm wondering if a bad brake booster can be a contributor to it?

A few weeks ago, I my car died on me while applying the brakes. The brakes are not stock.

I have 13" front 03 cobra brakes, rear 11" cobra brakes, 93 cobra master cylinder with a 3-2 port conversion, and summit racing bias adjustment on firewall.

Today I noticed while pushing the brake pedal it made a hissing sound. After some research, I need to replace it.

So could this cause a vacuum leak throughout the engine and cause problems?

I'm looking at a replacement, and I can only find a reman on Rock Auto.

General karthief · May 12, 2020

93 Cobra Boosters - Don't Get Taken for a Ride

What is the deal with the local parts store selling what they call a brake booster for a 93 cobra for 100$???? I know this cannot be right but what is it? Does anyone know? Has anyone bought one? I asked them to pull up one for my car and it was around the same price, and most of the part...

www.stangnet.com

KRUISR · May 12, 2020

If the leak is bad enough, yes. Look at the large line from the booster to the vacuum tree. The other large line goes to the intake as a vacuum source. If the booster is leaking bad enough it would be like disconnecting that line.

Mstng93SSP · May 12, 2020

Leaking or not, with your brake setup you should be running the 93 cobra brake booster and not the stock booster you have in there.

Chris

Mustang5L5 · May 12, 2020

Yes, a leaking booster can stall out the car.

91GTstroked · May 12, 2020

Mstng93SSP said:
Leaking or not, with your brake setup you should be running the 93 cobra brake booster and not the stock booster you have in there.

Chris

Probably, but it appears to be the original booster, and the brakes have been on the car for 15+ years without any trouble.

Mstng93SSP · May 12, 2020

Yeah, I get it. I'm just saying you will probably be surprised how much better your brakes will respond with the cobra booster.

nickyb · May 12, 2020

Agreed,new booster should be bigger.I run a 95 gt booster from autozone, lifetime warranty and all.

91GTstroked · May 12, 2020

It actually brakes pretty good, my 03 cobra only feels slightly better.

Blown88GT · May 12, 2020

91GTstroked said:
Well,

Some have known that I been fighting some gremlins lately! I'm wondering if a bad brake booster can be a contributor to it?

A few weeks ago, I my car died on me while applying the brakes. The brakes are not stock.

I have 13" front 03 cobra brakes, rear 11" cobra brakes, 93 cobra master cylinder with a 3-2 port conversion, and summit racing bias adjustment on firewall.

Today I noticed while pushing the brake pedal it made a hissing sound. After some research, I need to replace it.

So could this cause a vacuum leak throughout the engine and cause problems?

I'm looking at a replacement, and I can only find a reman on Rock Auto.

You need look no further. The hissing sound is the brake booster seal leaking.
Happened to me. You get a big vacuum leak when you push the brake pedal.
You're lucky if you can find a reman. The reman facility is closed to the COVID19.
I sent a part off for reman since they had none anywhere. It's stuck in the O'Reilly warehouse.

Philly’s Cardone Industries, hammered by auto slowdown in the pandemic, eliminates employees, report says

The pandemic has jolted the auto parts firms like Cardone Industries with shuttered auto-manufacturing plants and shelter-in-place orders.

www.inquirer.com

Most, if not all, of the remans are done by Cardone.

91GTstroked · May 12, 2020

Blown88GT said:
You need look no further. The hissing sound is the brake booster seal leaking.
Happened to me. You get a big vacuum leak when you push the brake pedal.
You're lucky if you can find a reman. The reman facility is closed to the COVID19.
I sent a part off for reman since they had none anywhere. It's stuck in the O'Reilly warehouse.

I found a reman on Rock Auto. Some have mentioned painting them because the stuff that's on them don't last.

Hopefully I don't have to bench bleed the master cylinder. I was planning on changing brake fluid this year. Looks like sooner than later.

Blown88GT · May 12, 2020

No brake bleeding necessary if you can separate the master cylinder from the booster without removing a brake line.
1-man brake bleeding is easy with an air compressor & a fitting for a spare fluid reservoir cap.
Dial down the pressure all the way & let it leak around the cap. Less than 5psi will push the fluid to the bleed screws.

91GTstroked · May 14, 2020

Blown88GT said:
No brake bleeding necessary if you can separate the master cylinder from the booster without removing a brake line.
1-man brake bleeding is easy with an air compressor & a fitting for a spare fluid reservoir cap.
Dial down the pressure all the way & let it leak around the cap. Less than 5psi will push the fluid to the bleed screws.

I have a similar kit, forgot what it's called, but works great. I hope I can remove booster without disconnected brake lines, but it looks like a very tight area.

Blown88GT · May 14, 2020

My BB was installed improperly at the factory, about 1/2" offset to the driver's side. It was obvious after getting it out, the firewall hole was not a clear hole, used a step drill bit to enlarge it.
The MC stud is so close to the shock tower I needed a mid-length socket. Bought a 14mm 1/4 inch drive deep well & had a friend turn it down on a milling machine. I think I had to remove one of the brake lines.

91GTstroked · May 17, 2020

Got it all done yesterday. I didn't have to remove the lines on the MC.

Brakes feel good, no more hissing sound when pushing on brake pedal.

Brakes Bad brake booster!

91GTstroked

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General karthief

wonder how much it would cost to ship you a pair

93 Cobra Boosters - Don't Get Taken for a Ride

KRUISR

Mstng93SSP

You have a nice rear end there Dave.

Mustang5L5

That is…until I whipped out my Bissell

91GTstroked

Mstng93SSP

You have a nice rear end there Dave.

nickyb

I gotta say i never painted my nuts, Never Ever

91GTstroked

Blown88GT

Philly’s Cardone Industries, hammered by auto slowdown in the pandemic, eliminates employees, report says

91GTstroked

Blown88GT

91GTstroked

Blown88GT

91GTstroked

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Brakes Bad brake booster!

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wonder how much it would cost to ship you a pair

You have a nice rear end there Dave.

That is…until I whipped out my Bissell

You have a nice rear end there Dave.

I gotta say i never painted my nuts, Never Ever

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