200tdi brake question - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old June 30th, 2015, 02:30 PM
lbwhotrod
Status: Offline
Les Wlton
91 D90
Member
 
Join Date: Oct 2014
Location: Oxnard, Cali
Posts: 29
Registry
200tdi brake question

Ok brothers, at my wits end and need help. My 1991d90 has a brake issue and I can't pass inspection. I have little to no rear brakes. I just rebuilt the entire brake system due to the truck being new to me and the rotors where warped when I bought it.

New:
Rotors
Shoes
Drums
Pads
Master cylinder
Rear brake cylinders, both
Rear brake lines
Cleaned t fitting

The brakes have been bleed many times. Tried gravity, vacuum, and pressure.

Pedal goes down 75% with minimal pressure. Feels like air in system but even under multiple pumps pedal does fully firm up. Front brakes grab nicely and with no issues. When I clamp off rear flex line, pedal stops at 10% of travel and is a solid pedal. I adjusted the drums.

My two thoughts are a blockage in tube or wrong master cylinder.

Please let me know before I punch a baby.

Thanks

Les
__________________
1991 D90. Love the personality, now just need to give her new head lights, lift up the front and rear, a nose job and something to dress up the tail.

200TDI, LT77, BW t-case.
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old June 30th, 2015, 02:32 PM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,232
Registry
Silly question, but you have adjusted the shoes?
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #3  
Old June 30th, 2015, 02:37 PM
lbwhotrod
Status: Offline
Les Wlton
91 D90
Member
 
Join Date: Oct 2014
Location: Oxnard, Cali
Posts: 29
Registry
Sure did. Was the first thing that I looked at after bleeding.
__________________
1991 D90. Love the personality, now just need to give her new head lights, lift up the front and rear, a nose job and something to dress up the tail.

200TDI, LT77, BW t-case.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old June 30th, 2015, 03:58 PM
rdavisinva's Avatar
rdavisinva
Status: Offline
Robert Davis
N/A
Member
 
Join Date: Oct 2004
Location: USA
Posts: 6,789
A bad brake flex hose can swell under pressure and negate the pressure to the rear brakes.
The brake proportioning valve can also be an issue.
I had a similar issue with our 1983 110 that was caused by the brake springs being installed incorrectly.
It was hard to tell, but I think the springs were pulling the shoe off the adjusting cam.
Anyway, got out the manual and switched the parts around and it worked fine.

Our 1983 is early and I don't know if a previous owner did this, but the rear brake lines had metric threads on one side and SAE fittings on the other side and had rear 109 wheel cylinders.
When I tried to replace the new wheel cylinders I ordered in for a 1983 110, the brake line wouldn't screw in, but luckily we had a set of 109 rear cylinders that worked fine.

Some of the brake petal assemblies have an adjuster that allows you to screw in and out to make the petal rod protrude further in and out against the master cylinder piston.
Screwing it out will cause less play and provide "more petal".
I don't know why, but sometimes air can get trapped in a 110 braking system and you need to adjust the petal.
You then need to adjust the petal out to get sufficient brakes.
As the air purges as a natural result of usage, the petal gets harder until the brakes eventually start dragging.
Then you stop and adjust the rod in to provide free play.
This can sometimes get repeated several times before it doesn't need any more adjustment.
When in this scenario, I keep a length of wood in the car to hold the petal in.
A 17mm wrench to remove the master cylinder, and 2 X 8mm wrenches to screw the end of the rod adjuster and lock it in place.
__________________
RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
Reply With Quote
  #5  
Old June 30th, 2015, 04:09 PM
Naplm00
Status: Offline
Matthew
1983 110 200tdi 3 door soft top
Member
 
Join Date: Sep 2010
Location: San Jose, California
Posts: 2,859
Did you bench bleed the new master? This MUST be done for it give pressure


https://youtu.be/kEPXgDGU6_0

NAPA AUTO PARTS
Reply With Quote
  #6  
Old June 30th, 2015, 04:13 PM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,232
Registry
If a clamped rear brake line gives a firm pedal, then something must not be setup correctly in the drums. are you sure that you have them together properly? Maybe a photo...
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #7  
Old June 30th, 2015, 04:40 PM
lbwhotrod
Status: Offline
Les Wlton
91 D90
Member
 
Join Date: Oct 2014
Location: Oxnard, Cali
Posts: 29
Registry
Will get a photo but unless i was missing parts when I bought the truck it is two springs behind the shoes, retainer and the adjuster. Yes, bench bleeding was done prior to install.

I can pull the drum off and had the wife slowly press down the brake (yes I know normally never a good idea) but the brake cylinders are not getting enough fluid to extend fully.

Please keep the ideas coming guys, I have been trying every idea I have.
__________________
1991 D90. Love the personality, now just need to give her new head lights, lift up the front and rear, a nose job and something to dress up the tail.

200TDI, LT77, BW t-case.
Reply With Quote
  #8  
Old June 30th, 2015, 04:58 PM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,232
Registry
Quote:
Originally Posted by lbwhotrod View Post
Will get a photo but unless i was missing parts when I bought the truck it is two springs behind the shoes, retainer and the adjuster. Yes, bench bleeding was done prior to install.
The springs can be in wrong. Did you replace the flex hose?
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #9  
Old June 30th, 2015, 05:00 PM
lbwhotrod
Status: Offline
Les Wlton
91 D90
Member
 
Join Date: Oct 2014
Location: Oxnard, Cali
Posts: 29
Registry
Sure did. I am going to feel like an a if it is just the springs. Will get a photo out as soon as I get home.
__________________
1991 D90. Love the personality, now just need to give her new head lights, lift up the front and rear, a nose job and something to dress up the tail.

200TDI, LT77, BW t-case.
Reply With Quote
  #10  
Old June 30th, 2015, 05:34 PM
rdavisinva's Avatar
rdavisinva
Status: Offline
Robert Davis
N/A
Member
 
Join Date: Oct 2004
Location: USA
Posts: 6,789
Quote:
Originally Posted by lbwhotrod View Post
Will get a photo but unless i was missing parts when I bought the truck it is two springs behind the shoes, retainer and the adjuster. Yes, bench bleeding was done prior to install.

I can pull the drum off and had the wife slowly press down the brake (yes I know normally never a good idea) but the brake cylinders are not getting enough fluid to extend fully.

Please keep the ideas coming guys, I have been trying every idea I have.
The rear wheel cylinder pistons should only need to extend a very small amount when all is adjusted properly... like 3 to 6mm depending on shoe adjustment.
Good thing the pistons didn't pop out.

After checking to make sure the rear springs are right, I would move to the petal rod adjustment.
__________________
RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
Reply With Quote
  #11  
Old July 1st, 2015, 01:08 PM
lbwhotrod
Status: Offline
Les Wlton
91 D90
Member
 
Join Date: Oct 2014
Location: Oxnard, Cali
Posts: 29
Registry
Red thank you. It was the upper spring position. Now they are perfect better than they have ever been.
__________________
1991 D90. Love the personality, now just need to give her new head lights, lift up the front and rear, a nose job and something to dress up the tail.

200TDI, LT77, BW t-case.
Reply With Quote
Reply

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

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
2 rear disc rotors 110 200tdi and 300tdi rear brake defender 110 up to 1999 Ben01 For Sale - Parts 1 October 6th, 2013 08:08 PM
Brake/Friction Pad (and maybe Brake Disc/Rotor) Replacement rijosho Defender Technical Discussions 62 March 16th, 2011 03:55 PM
Left brake lights work....the right and door brake lights won't? beko35 Defender Technical Discussions 4 June 27th, 2009 02:12 PM
difference: Disco 200tdi and Defender 200tdi? jaherring Defender Technical Discussions 30 June 3rd, 2005 10:10 AM
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 02:37 AM.


Copyright