HELP Master brake cylinder

[FluoFerret]

This master cylinder looks like it can do the job, but I doubt it will fit under the hood of any g-body 😒

Its a Dorman M390386

PONTIAC Dorman M390386 Dorman Brake Master Cylinders | Summit Racing

Free Shipping - Dorman Brake Master Cylinders with qualifying orders of $109. Shop Master Cylinders at Summit Racing.

www.summitracing.com

 

[L92 OLDS]

I run the factory master cylinder with an 1984 Seville proportioning valve. Works great

 

[Tony1968]

Classic Performance 7887B-MC Classic Performance Master Cylinder and Brake Booster Kits | Summit Racing

Free Shipping - Classic Performance Master Cylinder and Brake Booster Kits with qualifying orders of $109. Shop Master Cylinder and Brake Booster Assemblies at Summit Racing.

www.summitracing.com

I went this route. 1 and 1/8 inch bore

 

[malibudave]

Your front brake calipers piston size are around the size of stock, but your piston area is smaller than most 80s rear disc calipers.

For that I would run the Right Hand Drive 2000 S10 master cylinder. If you need more assist, you can replace the g-body booster for a '89-'90 B-body booster.

NEW MASTER CYLINDER OPTION

This master bolts right in no mods and actually works AC DELCO Master Cylinder Part # 89056529 or 18M974 (same master)

maliburacing.com

BBody brake booster/Master cylinder swap

I did the blazer front brake swap with slotted and drilled rotors on my Malibu and I want to upgrade the brake booster and master cylinder. I’ve read the best swap is the bbody 1990 caprice combo. I’m also planning to do a rear Camaro disc brake swap on the rear 10.75 is the biggest or correct...

gbodyforum.com

 

[Max Headroom]

It does matter,the angle of those (or lack there of) wilwood job's is not very practical.its leaning so far back that you'd have to jack the back of the car up to level it off to reach the full mark. I installed one Initially but it wasn't any good.they wouldn't send me a new one,they offered to rebuild mine in house only.(gtfo it's brand new)3 strikes you're out.I'm running one from 87 monte,disk/disk prop valve,wilwoods all around with no issues

It may matter that they are not tilted at too much of an angle but I have had more cars with a tilted MC than level.

 

[Injectedcutty]

Y'all got me thinking. I put this fancy chrome MC on the Cutlass and have sorta worried about the tilt of it from the get go. The bowls are full, and there isn't a way of the lines running dry unless the car goes upside down....

 

[Tony1968]

Y'all got me thinking. I put this fancy chrome MC on the Cutlass and have sorta worried about the tilt of it from the get go. The bowls are full, and there isn't a way of the lines running dry unless the car goes upside down....View attachment 157795View attachment 157796

But it looks so purty!!!

 

[FluoFerret]

Hello everybody!
Thank you all for your many replies, and my appologies for my absence, but Covid19 had me in its grips 🙁 but i am feeling better now. still struggling with my stamina.

A friend of mine gave me this master cylinder for free and told me it was for a disc/disc car (for a 1988 Camaro) and that it would fit my Lemans (angled and the right mounting flange size)

Dorman Products - M39576

Brake Master Cylinder

www.dormanproducts.com

The issue I have with this is, that it has two different bore sizes in one. 24,4mm and 36mm. Which one would be for the front brakes and which one for the rear? Or even: what was the purpose of this type of MC?
Any thoughts here?

 

[spidereyes455]

While a 3rd gen master will bolt to the booster you will need to modify your lines as the connection for them on a g body is on the opposite side of the f body.
Now when I did 4 wheel blazer discs on my 81 GP I used an 84 or 85 Eldorado prop valve since they were 4 wheel disc and similar size and weight to a g body. For the master i used a 1981 4 wheel disc trans am unit that is almost identical looking to a stock g master. The only other thing I should do is use the 88 and up b body booster cause it currently has less assist than I would like. But it will stop on a dime and give you 9.5 cents change.

 

[64nailhead]

Y'all got me thinking. I put this fancy chrome MC on the Cutlass and have sorta worried about the tilt of it from the get go. The bowls are full, and there isn't a way of the lines running dry unless the car goes upside down....View attachment 157795View attachment 157796

Wow Scott, does that look good. I really like the perspective of looking across the top of the front fenders with the hood open!