Master Cylinder Question

Joined
Sep 20, 2005
Messages
154
Location
Monticello, UT
I have a 78 40 with the 30 year old stock braking system on it and I was preparing for a trip this weekend after it had sat for most of the winter without being run. I noticed the reservoir for the rear brakes was low so I filled it up and figured life is good. I came out the next morning to find a puddle under the cruiser and all of the fluid had leaked out. It is not leaking from the reservoirs but where the master cyl bolts onto the brake booster. I have never replaced the master cylinder and do not know what it would take, 4 bolts? But I wanted to see if anyone could help me diagnose the problem.

Thanks!
 

PabloCruise

SILVER Star
Joined
Jun 3, 2004
Messages
21,169
Location
Northern Colorado
Sounds like you are leaking out the back.

I replaced my '78 MC w/ one from Toyota - Cruiser Dan at American Toyota.

You can do a bench bleed, I didn't.

4 bolts and two line fittings and two electrical connections.

Bleed the brakes and you are good to go!

Some people get an early 80 series MC. I think these are a different bore size, so I cannot remember if pedal effort goes up or down...

Anyone comment on the 80 series MC's?
 
Joined
Nov 4, 2007
Messages
397
You need to try to find a rebuilt one. I found one for $120, with $50 off if I gave them the core out of my old one. I purchased this one from NAPA - about $70 when I gave them the core out of mine.
 
Joined
Apr 4, 2006
Messages
13,969
Location
NorCal
You need to try to find a rebuilt one.

I totally disagree. I'd go with a new OEM unit from Cruiser Dan.

Lots of times when they leak fluid out the back it will get into the booster and ruin that too. :crybaby: Check to see if it will hold vacuum.
 

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