Soft brake after reversing - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old December 20th, 2014, 09:44 PM
JKC
Status: Offline
John
1997 D-90
Member
 
Join Date: Sep 2008
Location: Miami, FL
Posts: 60
Soft brake after reversing

So here's my problem. Brakes work fine in drive. When I go in reverse, they work fine as well,but right when I go back into drive I have a very soft brake and need to pump it up to restore braking power. Then it is never lost unless I go in reverse again. Have bled the brakes but still there. Any advice?
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old December 20th, 2014, 10:23 PM
carlosz's Avatar
carlosz
Status: Offline
Carlos
frank stein "frankie" in action RIP
Member
 
Join Date: Jun 2006
Location: east coast
Posts: 964
Registry
defective proportioning/biasing valve perhaps...
Reply With Quote
  #3  
Old December 21st, 2014, 10:41 AM
jafir's Avatar
jafir
Status: Offline
Jafir Elkurd
Flaky Green 198something ex-mod 90
Member
 
Join Date: Jan 2013
Location: Centerton, AR
Posts: 1,580
Registry
Maybe a loose wheel bearing causing the pistons in the calipers to compress more when you change direction?
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old December 21st, 2014, 11:14 AM
Ren Ching's Avatar
Ren Ching
Status: Offline
Skinny Pete
'84 90 "Yamelo"/'88 RRC "Chewbacca"
Member
 
Join Date: Mar 2007
Location: Downtown
Posts: 4,696
Registry
Check to see if the level in your master cylinder is low. When the car changes direction the fluid can slosh and expose the intake port on the M/C. Ask me how I know...

If it is low, you can fill it, then get any residual air out of the M/C by cracking the lines while someone holds the pedal down. Best wrap a rag around the line to keep brake fluid from getting everywhere.
Reply With Quote
  #5  
Old December 21st, 2014, 12:06 PM
Viton's Avatar
Viton
Status: Offline
Deaf Ember
Smart 4x4
Member
 
Join Date: Jan 2009
Location: La
Posts: 1,231
Couple of things as I see you are in Florida.

1. In your humid environment, you should be changing your fluid every year. As you probably know the fluid
actually pulls moisture out of the air & that moisture will rust everything in the brakes system.
2. For over 20 years I have had great success in bleeding my brakes with a MitiVac (only 1 person needed to do
this). I 1st suck as much old fluid out of the reservoir as possible & replace with new. Then I go to the
longest break line run &, with the vac, suck the fluid out of the bleeder until it's clean. This method allows for
NO air to enter the system.
Reply With Quote
  #6  
Old December 21st, 2014, 03:42 PM
Dogpilot's Avatar
Dogpilot
Status: Offline
James Wallace
Defender 90 1997 NAS ST
Member
 
Join Date: Jan 2014
Location: Flagstaff, AZ
Posts: 311
Registry
I second the bearing as well. Jack up all four wheels after you reverse and see which caliper has the most clearance on the pads to rotor. This would be the wheel with suspect bearings. It may also clunk when you try to lift the wheel while jacked up.
Reply With Quote
  #7  
Old December 23rd, 2014, 10:36 PM
JKC
Status: Offline
John
1997 D-90
Member
 
Join Date: Sep 2008
Location: Miami, FL
Posts: 60
Thanks for the advice. Early January I am planning to work on the swivel balls as I have some death wobble issues. I'll add to the list to flush the entire brake system and have a look at all the wheel bearings. I'll let you know what I come up with.
Reply With Quote
  #8  
Old December 24th, 2014, 08:36 PM
crown14's Avatar
crown14
Status: Offline
Verticalscrote
Volkswagen Super Beetle
D-90 Source Vendor
 
Join Date: Jul 2006
Location: 44 Nas Row, Inter Net, USA
Posts: 3,285
Registry
Quote:
Originally Posted by JKC View Post
Thanks for the advice. Early January I am planning to work on the swivel balls as I have some death wobble issues. I'll add to the list to flush the entire brake system and have a look at all the wheel bearings. I'll let you know what I come up with.
Have you got rear drums?
__________________
Note: The maximum size of your custom image is 500 by 100 pixels or 19.5 KB (whichever is smaller).
Reply With Quote
  #9  
Old December 25th, 2014, 01:49 PM
JKC
Status: Offline
John
1997 D-90
Member
 
Join Date: Sep 2008
Location: Miami, FL
Posts: 60
It's a 97. All discs.
Reply With Quote
  #10  
Old December 26th, 2014, 12:27 PM
sflash868's Avatar
sflash868
Status: Offline
Stephan Laputka
1995 D-90 SW
Member
 
Join Date: Jan 2004
Location: San Francisco, CA
Posts: 972
I think it might be helpful if you did a little more diagnostic work. I can't imagine it's that act of shifting into reverse but instead something you're doing while backing up. what happens if you back up in a straight line? What happens if you put he handbrake on and just shift between drive and reverse with out moving or touching the brakes pedal? do the brakes go to the floor then? Do they only go to the floor if your reversing like in a K turn or something?

I had a problem for a while where my brakes would bleed down if I shifted into low range. Wasn't the t-case obviously, it was that i only shifted into low when off road and the bouncing caused wobble in the bearings and spread that pads apart. I imagine this is something similar.
__________________
Land Rovers are by far the best looking 4x4 on the back of a flatbed...
Reply With Quote
  #11  
Old December 26th, 2014, 01:20 PM
Rocky's Avatar
Rocky
Status: Offline
Chris
72 + D1 drivetrain
Member
 
Join Date: Sep 2006
Location: Colonies Aka Boston
Posts: 8,795
Assume brake fluid level and type is correct.
Was any brake work performed before this started?
Wondering whether the pins or slides are seizing temporarily.
Its pretty weird what ever it is!
__________________
A friend of mine runs a land rover / range rover specialty repair shop. Based on his experience, they are capable of stopping anywhere, anytime, at any cost.

I don't know about the brakes, only their unreliability.
Reply With Quote
  #12  
Old December 26th, 2014, 10:53 PM
JKC
Status: Offline
John
1997 D-90
Member
 
Join Date: Sep 2008
Location: Miami, FL
Posts: 60
Yes, very wierd. It's been happening for so long I do no recall the circumstances when it started. I have correct fluid and it's all full. I've just become used to it. But just had a Valet guy who told me I need to get my brakes checked bc they do not work very well. That's bc he backed up. By the time I got in they worked fine. I'll try to track if it happens in both a turning situation as well as a straight line. Either way, in a week I'm flushing the entire system with new fluid, checking all wheel bearings, and checking swivel pins. I'll let you know how it goes.
Reply With Quote
  #13  
Old December 27th, 2014, 01:38 PM
carlosz's Avatar
carlosz
Status: Offline
Carlos
frank stein "frankie" in action RIP
Member
 
Join Date: Jun 2006
Location: east coast
Posts: 964
Registry
Check out that the push pin to the master cylinder has the proper travel and length...have seen this issue in discos.
__________________
the truck ran like a "raped ape"
A fussy warm weather creature...
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
brake

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Reversing polarity on Jaeger amp meter? o2batsea Series Technical Discussions 1 September 9th, 2014 01:00 PM
Shudder in clutch when reversing Roover Defender Technical Discussions 14 April 15th, 2014 02:04 PM
Land Rover Defender clear reversing light/lamp reverse Ben01 For Sale - Parts 3 February 3rd, 2014 04:09 PM
Won't start after after torrential downpour?! jijalicious Defender Technical Discussions 51 November 10th, 2011 12:17 PM
Brake light on after brake install wicks Defender Technical Discussions 6 October 13th, 2003 07:01 PM


All times are GMT -5. The time now is 02:35 AM.


Copyright