No brake fluid/pressure to RR caliper 1990 740 GL no ABS

Thread Tools
 
Search this Thread
 
Old May 12, 2018 | 05:12 PM
  #1  
dnarby's Avatar
Thread Starter
|
Senior Member
Joined: Jun 2010
Posts: 194
Likes: 3
From: New Haamp-sha
Question No brake fluid/pressure to RR caliper 1990 740 GL no ABS

Hi all,


Went to replace the brake pads, and decided to flush the fluid (overdue). Could not get any fluid to come out of the bleeder (I have a helper).


Replaced the caliper. Still can't get any fluid to come out. Replaced the master cylinder. Still no fluid.


I'm stumped. I've read proportioning valves can get stuck, but I can't find out if this model has a brake proportioning valve (or where it is). I see a block under the MC where two lines go in and four go out.


Halp! Thanks in advance.
 
Reply
Old May 13, 2018 | 07:39 AM
  #2  
jagtoes's Avatar
Senior Member
Joined: Jan 2011
Posts: 1,210
Likes: 14
From: New York
Default

Remove the brake hose and see if you have fluid at the metal brake line.
 
Reply
Old May 13, 2018 | 04:02 PM
  #3  
dnarby's Avatar
Thread Starter
|
Senior Member
Joined: Jun 2010
Posts: 194
Likes: 3
From: New Haamp-sha
Exclamation

Originally Posted by jagtoes
Remove the brake hose and see if you have fluid at the metal brake line.

No significant fluid (just a dribble, then nothing). Tried the bleed routine (brake pedal down, hold thumb over the end, pedal up, release thumb, repeat) some dozen times, but no fluid.


Removed the rear line fittings at the brake distribution block, one fitting gushed fluid.


Removed the other, no fluid.


Gently pushed a blunt steel probe into the fitting opening on the block (thinking something was stuck or lodged in there), after which fluid came out strong during the bleed routine (at the distribution block).


Thought I had it licked, but after putting everything back together, no air or fluid came out at the RR brake line.


Went back and rechecked the rear line connection at the distribution block, and there was still good flow there.




...Is there some other valve somewhere on this?


Otherwise, is it possible that I have a clogged brake line?! Seems unlikely...






EDIT: Searched this thing called the Inter-net and saw this http://s4.zetaboards.com/CJ3B_Bullet...6219&t=1181204


Which said: "You could have blockages in the flexible rubber lines - two on the front and one in the rear - it's very common for the interior of the flex lines to swell and cause blockages. Without disassembing ALL the brake lines on your vehicle and assessing their condition, it's very difficult to give you any accurate determination of the condition of the INTERIOR of the brake lines."


So I'm thinking I need to replace the short rubber lines all around (they might be original equipment..!)
 

Last edited by dnarby; May 13, 2018 at 05:21 PM. Reason: Derp
Reply
Old May 16, 2018 | 10:45 PM
  #4  
dnarby's Avatar
Thread Starter
|
Senior Member
Joined: Jun 2010
Posts: 194
Likes: 3
From: New Haamp-sha
Default

Jagtoes for the win!

Spot on - It was a bad flexible hose. Couldn't get the fitting off, so I cut the line directly in front of the fitting and presto!



...THE DOT3 MUST FLOW.


Now it's off to the ahtow pahts stoah for a fitting and a line.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
danspies
Volvo 240, 740 & 940
12
May 17, 2018 05:49 AM
Ryan911t
Volvo 240, 740 & 940
8
Aug 14, 2017 12:46 AM
Counselor828
Volvo S40
1
May 18, 2009 09:58 PM
mylesfalconer
Volvo 240, 740 & 940
2
Aug 20, 2008 12:40 AM




All times are GMT -5. The time now is 02:01 AM.