1'' bore FJ80 master cylinder (1 Viewer)

Joined
Sep 8, 2005
Messages
97
Location
Dundee, OR
I read about these on a minitruck site and it said that the large 1" bore will get rid of spongy pedal syndrome. Since I went to front and rear discs my pedal has always felt like there is air in the system. I've bled the brakes to death with no avail. I figure the FJ80 MC is worth a shot. Does anybody know if the 80 series MC bolt pattern will match up with a post 75 style booster?
 
Joined
Apr 10, 2004
Messages
1,639
Location
san pancho, ca
 
 
4wheel disk brakes require a minimum of 15/16th bore...
If you can't find an fj80 master, there are several toyota 15/16th donors available.
Several of them even came equipped w/4wheel disc brakes from the factory (Cressida, Supra).

[edit] Toyota master cylinder bore is typically cast on the passenger side of master...
 

dgangle

total rice
Joined
Nov 24, 2004
Messages
4,010
Location
Heart of Dixie
 
 
 
Marlin's MC worked fine for me. 1 very short push on the pedal and rubber is sqealing. Now if I could just get my proportioning right w/ 4WDB. The prop valve helps but does not fully cure.....
 

nat

Joined
Sep 20, 2005
Messages
1,999
Location
Los Gatos, California
 
 
 
Does that mean I can bolt an FJ80 master cylinder up to my 1972 FJ55 vacuum booster? I have 4 wheel discs and it sure won't lock up the rubber, I am hoping this will make a difference.
 

esh

SILVER Star
Joined
Apr 22, 2003
Messages
2,054
Location
Oregon
 
 
 
Haven't heard a lot about changing out boosters. I'm working on this upgrade as my front axle continues to give me problems and recently puked oil onto the pads. Why not spend more and get new calipers/mc/pads and maybe a rotor upgrade too! :rolleyes:

Used calipers were cheap, and I'm eyeing the Aisin 80 MC from liquidoffroad.
 

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