Which master cylinder do I get?
#1
Senior Member
Posts like a Turbo
Thread Starter
Join Date: Jul 2004
Posts: 226
Likes: 0
Received 0 Likes
on
0 Posts
![DJ SHO is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Most place like Autozone and Advance Auto PArts list a few different ones, I believe a 6" and an 8". Which one do I choose? I think they had an 8" one with the reservoir for like 10 bucks more. Should I just go with that one to make it easier? Boy is my MC shot all to hell.
![Mad](https://www.gmforum.com/gm/images/smilies/icon_mad.gif)
#2
Senior Member
Certified Car Nut
Join Date: Oct 2003
Posts: 19,756
Likes: 0
Received 0 Likes
on
0 Posts
![1993 SLE is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
I have had to replace mine and I think that it is 8" I'm not sure. All you need to do is measure your orignal one and go from there
I would say to get a reman with a lifetime warrenty from NAPA and reuse your old reservoir.
I think that I paid like 30 after the core
![Laughing](https://www.gmforum.com/gm/images/smilies/icon_lol.gif)
I would say to get a reman with a lifetime warrenty from NAPA and reuse your old reservoir.
I think that I paid like 30 after the core
#4
Senior Member
Posts like a Northstar
Join Date: Apr 2004
Location: Minneapolis, MN
Posts: 566
Likes: 0
Received 0 Likes
on
0 Posts
![CSFiend is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
My 94 had a 6" master. I picked up an 8" from a junkyard thinking that it would fit. It doesn't. The resivoir is too tall and won't fit under the strut tower brace. Just measure the one you have, and get the same size to replace it with.
#5
Senior Member
True Car Nut
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Likes: 0
Received 3 Likes
on
3 Posts
![opensourceguy is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
If you have another car, remove the MC, and take it with when you get the new one to compare the two. That way you'll know its the right size. I do that all the time, because the idiots that work at Autozone/Napa [sorry Kenn, had to say it], Advanced Auto, and Pep-boys screw up my parts all the time.. and I NEVER walk out there with the wrong part [I think they have my pic in the back and it says at the bottome "don't eff with this guy"]. Don't take your MC out and expect to drive your car there though
.
-justin
![Wink](https://www.gmforum.com/gm/images/smilies/wink.gif)
-justin
#7
Senior Member
True Car Nut
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Things I've found in the past 20min;
My books list one MC for 92-95
which ACDelco crosses to 174-860. No one else can use this number. Advance and RicerZone don't carry ACDelco.
Bumper to bumper says that number is no good, But they only list XDE174-860 as the MC for my car. And they'd have to order it.
My books list one MC for 92-95
GM PART # 25632708
CATEGORY: Brake Master Cylinder
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $305.83
OUR PRICE: $152.92
DESCRIPTION: CYLINDER
CATEGORY: Brake Master Cylinder
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $305.83
OUR PRICE: $152.92
DESCRIPTION: CYLINDER
Bumper to bumper says that number is no good, But they only list XDE174-860 as the MC for my car. And they'd have to order it.
#8
Senior Member
True Car Nut
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Figuring you have the right MC on your car you could just measure the one on there. However, I'm not confident I have the right one now.
So, What are the differences in cars that require the different sizes?
Autozone asks if you have disc/drum, and ABS. I see no reason ABS matters, but anyway.. all 92-95'2 have disc/drum.
So, What are the differences in cars that require the different sizes?
Autozone asks if you have disc/drum, and ABS. I see no reason ABS matters, but anyway.. all 92-95'2 have disc/drum.
#10
Senior Member
True Car Nut
![Default](https://www.gmforum.com/images/icons/icon1.gif)
http://www.teamscr.com/grmbrakes.html
Guessing isn't good enough when selecting a master cylinder. If they both truely served the same purpose GM would have no reason for creating the extra expense of two parts. I don't know why AutoZone and others list two master cylinders as available for use when most here have reported to be using the 8". There'* some difference, obviously stoke, but bore may differ too. Who even wants to calculate what that would do to ABS effectivness.
Can anybody think of some telltale that may be present on a car to indicate which MC would be used?
Guessing isn't good enough when selecting a master cylinder. If they both truely served the same purpose GM would have no reason for creating the extra expense of two parts. I don't know why AutoZone and others list two master cylinders as available for use when most here have reported to be using the 8". There'* some difference, obviously stoke, but bore may differ too. Who even wants to calculate what that would do to ABS effectivness.
Can anybody think of some telltale that may be present on a car to indicate which MC would be used?