Brock Brum

Hi guys,

pedal going to floor intermittently and suspect master cylinder. I have an 92 civic hatch. Have drum brakes but converting to rear disc. Should i upgrade the master?

should i get an integra one? Maybe just an eg si one?

would i need to replace the booster as well if i upgrade to the teg or si one?

Anyone done a master upgrade? I am going to buy oem honda just wondring which one

thank you

tony_2018

integra master cylinder and brake booster if you can.

egsleepercivic

are you upgrading the Fronts ?

What size MC is in there now ?

Brock Brum

Just stock civic vx one

egsleepercivic

my si with stock rear disk came with a 13/16th, some of the exs had 7/8, I am upgrading my si to integra sized fronts already has rear disks, I am upgrading to 91 ex MC that is 15/16ths and bolts to the stock booster and requires no re bending of the stock brake lines, it bolts up directly with no mods.

If you are not upgrading the fronts, you don't need to upgrade the MC

Brock Brum

91 ex? Thats an EF body style. It matches the EG in 92?

i have to buy a new one regardless and am going oem so should i buy the EF one you are recommending? Do you have the part number by any chance?

thanks for your help bud!

egsleepercivic

here you go !

https://honda-tech.com/forums/honda-...civics-364783/

https://honda-tech.com/forums/suspen...inder-3079258/

and I ordered this one from amazon, it is now sitting in my living room waiting to be installed in the hatch.

Brock Brum

thanks bud. I appreciate it. I will go that route for sure!

94 Civic Si

That is pretty sweet man! I have a '94 Si w/ ABS, pretty sure it is the 13/16th MC. Will the '91 EX MC work on an ABS body?

94eg!

iTrader: (2)

Brock-Brum,

Brake pedal intermittently loosing pressure and falling to the floor (with no leaking of fluid anywhere to be found), is definitely the #1 symptom of a bad Master Cylinder.

Fortunately your future rear disc swap does not require any "upgraded" of the master cylinder. As others have mentioned, the Si with rear discs uses the same 13/16" unit. Therefore, simply replace it with the same size. The OEM Honda 13/16" master cylinder (now discontinued by Honda) was made by Nissin. You can still buy the same Nissin unit from both Nissin and Adler. There is also another brand that has them made without the Nissin logo on them (I think it's NTP). Honda made this exact same 13/16" master cylinder under many different part numbers, so sometimes you can find better deals by searching ebay or google for these older ones.

• 46100-SR3-043
• Replaces:46100-SH3-A02, 46100-SH3-A03, 46100-SH3-A04, 46100-SH3-A05, 46100-SH3-A06, 46100-SR3-003, 46100-SR3-013, 46100-SR3-023, 46100-SR3-033, 46100-SR3-305

If and when you plan on upgrading your front brakes, then a master cylinder upgrade is in order (but not a booster upgrade). Calipers with 54mm pistons use a 7/8" master cylinder (most big-rotor non ABS Civic calipers). Calipers with 57mm pistons require a 15/16" master cylinder (most Integra calipers). With either setup their is an OEM master-cylinder option that keeps your stock brake booster.
- 7/8" = 93-95 Civic EX non-abs Coupe (I run this setup on my 94 CX)
- 15/16" = 90-91 Civic EX Sedan

94eg!

iTrader: (2)

Your 94 ABS chassis already comes with a 15/16" master cylinder (46100-SR3-833). Honda states this master cylinder is specifically setup for ABS (whatever that means). And even if the 91 EX MC you are asking about was compatible with ABS, it won't match your stock booster as the mounting studs are angled in the opposite direction.

94 Si ABS 46100-SR3-833


90-91 EX Sedan 46100-SH4-A11 (note opposite angle mounting flange)

94 Civic Si

That is some great info - thank you!