Brakes ‘93 Cobra Brake Booster and Master Cylinder Question

Willybill32 · Jun 28, 2023

I apologize in advance for asking the question, but I’m not finding much on the topic in my searches of the forum…

My ‘86 GT is with Kevin @ K and K Custom Mustangs. He’s gonna pull the engine and transmission to clean up the engine bay. We’re planning on replacing the original brake booster and master cylinder with the ‘93 Cobra booster and master cylinder. I’m looking at LMR.com, and they want $269 (on sale!) for the booster and MC. Rock Auto has a new MC and new Raybestos booster for a little more than half LMR’s price, and that just seems like too large a difference. Does anyone have any experience with these items from Rock Auto.

Bill

General karthief · Jun 28, 2023

I have gotten stuff from Rockauto for years, even returning stuff was not a huge hassle.
stuff like that from LMR are reboxed anyway, , LMR does have the best customer service of any company (in my experience)

Noobz347 · Jun 28, 2023

Double and triple-check that you order the [correct] part. That aside, Rock Auto deals in volume, and their prices are often the best available.

I've had hassles returning things to Rock Auto but my portion of the failure was initially ordering the incorrect part.

General karthief · Jun 28, 2023

Interesting reading here: https://stangnet.com/mustang-forums...dont-get-taken-for-a-ride.914282/post-9215765

Mustang5L5 · Jun 28, 2023

I ran the Reybestos 93 cobra MC for years. No issues.

The only NEW booster being sold today is the SKP booster. It’s highly likely the booster LMR is selling is this part reboxed.

Just buy from RA. There’s a 5% off code if you Google.

rednotch · Jun 28, 2023

Not surprising lmr marking up parts store stuff is nothing new, anything branded 5.0 resto tends to be one of if not the cheapest option available packaged as kit for the most profit.. With the cardone just be ready to prep and paint the booster, some cores are pretty ruff. Some times you can find better deals then rock auto some times you can't, there shipping ads up fast since there pretty much a drop shipper.

Willybill32 · Jun 29, 2023

General karthief said:
Interesting reading here: https://stangnet.com/mustang-forums...dont-get-taken-for-a-ride.914282/post-9215765

Thanks, General! That's helpful!

Bill

General karthief · Jun 29, 2023

Willybill32 said:
Thanks, General! That's helpful!

Bill

I just regurgitate what I find here at
I don't mean to be helpful, total accident.

AeroCoupe · Jun 29, 2023

Typically I can get the booster and MC for less than $200 from local parts stores. You are going to need a 3-2 kit unless Kevin is going to replumb the brake lines to eliminate that need. Seeing how he does his work that is what he will do as it looks a lot cleaner.

Mustang5L5 · Jun 29, 2023

rednotch said:
Not surprising lmr marking up parts store stuff is nothing new, anything branded 5.0 resto tends to be one of if not the cheapest option available packaged as kit for the most profit..

It still surprised me the number of folks that don't understand this. I get the sense from some FB postings that some think LMR is actually manufacturing these parts.

Things like power steering pumps, steering racks, boosters, replacement calipers, gas tanks, etc you are better off going to local auto parts stores.

Willybill32 · Jun 29, 2023

AeroCoupe said:
Typically I can get the booster and MC for less than $200 from local parts stores. You are going to need a 3-2 kit unless Kevin is going to replumb the brake lines to eliminate that need. Seeing how he does his work that is what he will do as it looks a lot cleaner.

@AeroCoupe, LMR has a MM conversion kit for like $35 for this conversion. I'll probably get that.

Bill

AeroCoupe · Jun 29, 2023

Did some digging and Mike has a pretty slick way of avoiding all the piping with a 3-2 here:

Brakes - 3-2 port brake conversion using SN95 fitting

I’ve often referenced this method, but never had pics. Until now. When converting to rear disk, or aftermarket disk brakes, one needs to change the MC from the factory 3-port MC to a 2-port variety. Max Motorsports sells a kit for this, but there is another method, that is somewhat cleaner...

stangnet.com

Any this nice guy shows how to install here:

Mustang5L5 · Jun 29, 2023

Wish someone Re popped that rear fitting. It’s a much cleaner 3-2 conversion that the other kits.

Willybill32 · Jun 30, 2023

Mustang5L5 said:
I ran the Reybestos 93 cobra MC for years. No issues.

The only NEW booster being sold today is the SKP booster. It’s highly likely the booster LMR is selling is this part reboxed.

Just buy from RA. There’s a 5% off code if you Google.

Mike, thanks for your input. I decided to order the parts from Rock Auto, and we'll see how it goes.

Bill

Brakes ‘93 Cobra Brake Booster and Master Cylinder Question

Willybill32

But at least it's tight!

General karthief

wonder how much it would cost to ship you a pair

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

General karthief

wonder how much it would cost to ship you a pair

Mustang5L5

That is…until I whipped out my Bissell

rednotch

I'd like to remain having one chocolate starfish

Willybill32

But at least it's tight!

General karthief

wonder how much it would cost to ship you a pair

AeroCoupe

lube between the nut and the face. I know my lubes

Mustang5L5

That is…until I whipped out my Bissell

Willybill32

But at least it's tight!

AeroCoupe

lube between the nut and the face. I know my lubes

Brakes - 3-2 port brake conversion using SN95 fitting

Mustang5L5

That is…until I whipped out my Bissell

Willybill32

But at least it's tight!

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Brakes ‘93 Cobra Brake Booster and Master Cylinder Question

But at least it's tight!

wonder how much it would cost to ship you a pair

Stangnet Facilities Maint Tech... Er... Janitor

wonder how much it would cost to ship you a pair

That is…until I whipped out my Bissell

I'd like to remain having one chocolate starfish

But at least it's tight!

wonder how much it would cost to ship you a pair

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

But at least it's tight!

lube between the nut and the face. I know my lubes

That is…until I whipped out my Bissell

But at least it's tight!

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