Rising Sun Member Forums  

Go Back   Rising Sun Member Forums > Toyota 4x4 > General Tech Forum

Reply
 
Thread Tools
  #1  
Old 07-01-2010, 09:20 PM
Bruiser's Avatar
Bruiser Bruiser is offline
Rising Sun Member
 
Join Date: Sep 2008
Location: Littleton
Posts: 299
Default What's the Best Option

I think I have what is a pretty quick question for you guys. I noticed the rear cylinder on my master cylinder was empty the other day. Since I cannot find a leak on any of the lines or connections I assume it leaking into the brake booster and then getting burned. So, my questions are:

- Is there a test I can run to confirm my suspicion
- What is the best replacement option? Rebuild, Used (years and Models?), aftermarket?

Anything I am missing? By the way, I have a 78 FJ40.

Thanks for the help.

Justin
__________________
__________________________
Justin - Relocated to Littleton
TLCA # 18376
78 FJ40, Rear Locker, 33's, power steering, sbc, Front axle serviced and approved by Rising Sun 4x4
Reply With Quote
  #2  
Old 07-01-2010, 10:11 PM
wesintl's Avatar
wesintl wesintl is offline
Hard Core 4+
 
Join Date: Aug 2005
Location: in da house
Posts: 7,462
Send a message via AIM to wesintl
Default

ubolt the 4 nuts to the booster and look.. you'll see if it's leaking in there.
__________________
See you on the trail
WØREK
Couple o' FJ40's, BJ70, UZJ100, TDI 66FJ40,82FJ60,97FZJ80
TLCA#4180
Reply With Quote
  #3  
Old 07-02-2010, 07:30 AM
Bruiser's Avatar
Bruiser Bruiser is offline
Rising Sun Member
 
Join Date: Sep 2008
Location: Littleton
Posts: 299
Default

I opened it up expecting to find a soupy mess and while it wasn't clean, it wasn't a disaster. There was definitely some crap in there but most of it looked older and dried out. So, I am not sure what that means. I would expect to find some stuff in there since the car is 30 years old but I am not sure how much is too much. I can post pics if that helps.

Justin
__________________
__________________________
Justin - Relocated to Littleton
TLCA # 18376
78 FJ40, Rear Locker, 33's, power steering, sbc, Front axle serviced and approved by Rising Sun 4x4

Last edited by Bruiser; 07-02-2010 at 05:22 PM.
Reply With Quote
  #4  
Old 07-02-2010, 04:39 PM
Art Volmer's Avatar
Art Volmer Art Volmer is offline
Cruise Moab Committee
 
Join Date: Jan 2007
Location: Denver
Posts: 268
Default

Have you pulled the drums off the rear to see if the shoes are wet? Good luck with locating the leak.
Reply With Quote
  #5  
Old 07-02-2010, 05:24 PM
Bruiser's Avatar
Bruiser Bruiser is offline
Rising Sun Member
 
Join Date: Sep 2008
Location: Littleton
Posts: 299
Default

Quote:
Originally Posted by Art Volmer View Post
Have you pulled the drums off the rear to see if the shoes are wet? Good luck with locating the leak.
I have not tried that. Thanks
__________________
__________________________
Justin - Relocated to Littleton
TLCA # 18376
78 FJ40, Rear Locker, 33's, power steering, sbc, Front axle serviced and approved by Rising Sun 4x4
Reply With Quote
  #6  
Old 07-02-2010, 06:10 PM
Rzeppa's Avatar
Rzeppa Rzeppa is offline
Cruise Moab Committee
 
Join Date: Aug 2005
Location: Kittredge CO, USA
Posts: 4,946
Default

Quote:
Originally Posted by Art Volmer View Post
Have you pulled the drums off the rear to see if the shoes are wet? Good luck with locating the leak.
I *think* he was referring to the rear reservoir of the master, not the slave wheel cylinders.

Justin, I assume you are referring to the rear reservoir for the brake master cylinder and not the actual cylinder, right? I suggest simply refilling it in conjunction with a good bleed session on all 4 rear slave wheel cylinders, then monitor for leaks after driving some miles. In particular, look for streaks on the inside of the rear tires from leaking fluid.

It would be helpful in diagnosing the root cause to know whether you have had this rig for a while and are familiar with it, whether the brakes seem otherwise normal, how stock it is, whether this occurred suddenly or over a period of time, etc.
__________________
Jeff Zepp
Kittredge CO USA
1971 & 1976 FJ40s, 1978 FJ45, 1987 FJ60
Rising Sun 4WD Club, TLCA #4063
http://american3dprinting.net/
Reply With Quote
  #7  
Old 07-02-2010, 07:18 PM
Bruiser's Avatar
Bruiser Bruiser is offline
Rising Sun Member
 
Join Date: Sep 2008
Location: Littleton
Posts: 299
Default

Yes, rear reservoir of the master. It has gone almost empty twice in the last couple of months. I filled it before the Argentine Pass run a couple of weeks ago and it has be fine since but I don't think the problem just magically cured itself. I have had this rig two years but this is the first time I have had this happen.
__________________
__________________________
Justin - Relocated to Littleton
TLCA # 18376
78 FJ40, Rear Locker, 33's, power steering, sbc, Front axle serviced and approved by Rising Sun 4x4
Reply With Quote
  #8  
Old 07-02-2010, 07:58 PM
Old40Dog's Avatar
Old40Dog Old40Dog is offline
Cruise Moab Chairman
 
Join Date: Mar 2009
Location: Evergreen, Calirado
Posts: 1,292
Default

Quote:
Originally Posted by Bruiser View Post
Yes, rear reservoir of the master. It has gone almost empty twice in the last couple of months. I filled it before the Argentine Pass run a couple of weeks ago and it has be fine since but I don't think the problem just magically cured itself. I have had this rig two years but this is the first time I have had this happen.

Most likely one of the rear wheel cylinders are leaking. Jeff's method of identifying which one on the tire is the easy way. Pretty easy rebuild on the wheel cylinders Justin. Just a bit time consuming with the tear down, rebuild, bleeding...should fix the problem though.
__________________
Dave K,TLCA#20150,KFØDOG,'69 FJ40,'92 FJ80 {Isuzu diesel conversion underway} ,2011 Replica M416 w/RTT,'98 Taco Xtracab 4X4, Project='72 FJ40, '05 Passat TDI-DD.
"It is the first responsibility of every citizen to question authority." "A republic, if you can keep it". Benjamin Franklin 1706-1790
"The problem with socialism is that eventually you run out of other people's money [to spend]." Margaret Thatcher 1925-2013
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 12:41 PM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.