Brake problem - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old April 5th, 2014, 04:34 PM
akrockhound's Avatar
akrockhound
Status: Offline
Jack
1988 RHD 110
Member
 
Join Date: Dec 2012
Location: Alaska, Washington
Posts: 106
Registry
Brake problem

Looking for anyone with a hunch what these symptoms might mean (110, RHD, V-8, 1988).

I did a search of previous threads but did not hit paydirt

  • Occasionally my brakes feel like they are old style brakes - not power brakes
  • the pedal is still firm (maybe a bit firmer actually) but I have to apply a lot more pressure to stop
  • It seems when this happens the pedal does not go as far down - its firmer and engages higher
  • vacuum hose from intake manifold is tight and in good condition
  • no obvious pulling to one side or the other when I am experiencing the problem
  • Seems totally random, I can't associate it with anything else (temperature, speed ?)
  • Is it the master cylinder, booster, that partitioning valve on the bulkhead below the master cylinder?

It is not (yet) posing an unsafe condition but if anyone recognizes the symptoms i'll be better prepared to make the necessary fixes - thanks
__________________
'88 ROW 110 5-door SOLD
'01 Disco II
'95 RRC LWB
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old April 5th, 2014, 06:17 PM
cgalpin's Avatar
cgalpin
Status: Offline
Charles Galpin
'94 D90 ST, '63 SeriesIIA
Site Team
 
Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,624
Registry
I believe firmer indicates lack of vacuum. With the ignition off, press on the brake pedal. Does it feel like that when this occurs? If yes, then you are losing vacuum somehow.
__________________
Quote:
Originally Posted by pendy
I'm here for the D's
Reply With Quote
  #3  
Old April 5th, 2014, 07:02 PM
Roadsiderob's Avatar
Roadsiderob
Status: Offline
Robert Dassler
1994 D90
D-90 Source Vendor
 
Join Date: Apr 2004
Location: Albuquerque, NM, USA
Posts: 994
There is a vacuum check valve on the intake that the booster gets it's vacuum through. Check for dirt/blockage/sticking.
__________________
Rob Dassler
SWR Automotive
505-872-7818 (shop)
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old April 5th, 2014, 08:42 PM
akrockhound's Avatar
akrockhound
Status: Offline
Jack
1988 RHD 110
Member
 
Join Date: Dec 2012
Location: Alaska, Washington
Posts: 106
Registry
check valve

No check valve at the intake manifold but the vacuum hose connects to a white plastic fitting at the servo and the parts diagram calls that a valve. I presume that 's what you are referring to. Does it pull right out of the server with a tug? It has a black rubber grommet that holds it in place. Just don't want to force it out if it has something holding it from the other side.
__________________
'88 ROW 110 5-door SOLD
'01 Disco II
'95 RRC LWB
Reply With Quote
  #5  
Old April 6th, 2014, 04:47 PM
Gren_T's Avatar
Gren_T
Status: Offline
Gren Thomas
1985 90 300tdi auto
Member
 
Join Date: Feb 2005
Location: bridgend, wales , UK
Posts: 413
check for cracks on the booster around the area where the brake cylinder is mounted, It may help to get someone to depress the brake pedal while you look for movement.

regards
Gren
Reply With Quote
  #6  
Old October 13th, 2014, 11:32 AM
akrockhound's Avatar
akrockhound
Status: Offline
Jack
1988 RHD 110
Member
 
Join Date: Dec 2012
Location: Alaska, Washington
Posts: 106
Registry
it was the valve

It turned out the problem was the valve at the intake manifold end of the brake servo vacuum line. It screws into the top of the intake manifold

The valve is spring-loaded - I think it is a one-way valve- but in mine the spring was bent and the valve was inop. Found it at Rimmer Brothers for about $5.
__________________
'88 ROW 110 5-door SOLD
'01 Disco II
'95 RRC LWB
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
Brake problem Allybezz Defender Technical Discussions 2 February 20th, 2013 05:03 PM
Parking brake problem, handle popping back UP. Hans Defender Technical Discussions 14 January 19th, 2010 02:34 PM
brake caliper bolt problem WhiteD90 Defender Technical Discussions 24 April 29th, 2008 11:10 AM
Help, brake light problem! Dfndr90 Defender Technical Discussions 5 July 11th, 2005 07:39 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 09:37 AM.


Copyright