Jump to content


Photo

Replacing brake servo


  • Please log in to reply
10 replies to this topic

#1 cypermethrin

cypermethrin

    Member

  • Settled In
  • PipPip
  • 195 posts

Posted 14 October 2010 - 10:56 AM

Jumped into my wife's 300 tdi last night and had the shock of my life while trying to brake - blimey they are rubbish - has to litterally stand on the pedal to avoid the back of a van.

Looks like the brake servo is leaking (it has all new lines/brake shoes/fluid etc etc) can I replace the servo without needing to empty the master cylinder etc of brake fluid etc - if so how do I go about doing this ?

Thanks very much
Land Rover Defender 90 300TDi

#2 K88 MUD

K88 MUD

    Old Hand

  • Settled In
  • PipPipPip
  • 312 posts
  • Location:Normaly under a Land Rover

Posted 14 October 2010 - 11:22 AM

Yes you can but have you checked the vacuum pump first ?
Clevelands only local independant L/R garage with full dealership diagnostics.

www.4x4lrs.com

#3 mickeyw

mickeyw

    Petrol Head

  • Long Term Supporters
  • 2,513 posts
  • Location:On the edge of Surrey and Sussex

Posted 14 October 2010 - 11:27 AM

How long ago were the other parts replaced, and were the brakes OK after said parts were fitted?

Just thinking there could be some air still in the system, or maybe the new pads are not bedded in correctly?

Michael

1986 Ninety 3.9 EFI Auto LPG 'Jolted' | 1990 Range Rover Vogue SE Auto LPG | 1986 One-Ten CSW V8 LPG


#4 cypermethrin

cypermethrin

    Member

  • Settled In
  • PipPip
  • 195 posts

Posted 14 October 2010 - 11:49 AM

thanks for the replies - brake rebuild was done about 1000 miles ago - I don't drive it that much and remarked at the time of the rebuild that they were "pants" - the usual "they will bed" reply came. Clearly they have not improved any since then.

I'll check the vaccum pump tonight - I have not got anything to meansure the pressure - will have to do the thumb thing ...

Had a TD5 before can can't recall the brakes being this dire.....

Thanks
Land Rover Defender 90 300TDi

#5 markyboy

markyboy

    Old Hand

  • Settled In
  • PipPipPip
  • 330 posts
  • Location:Stoke on Trent, UK

Posted 14 October 2010 - 03:20 PM

thanks for the replies - brake rebuild was done about 1000 miles ago - I don't drive it that much and remarked at the time of the rebuild that they were "pants" - the usual "they will bed" reply came. Clearly they have not improved any since then.

I'll check the vaccum pump tonight - I have not got anything to meansure the pressure - will have to do the thumb thing ...

Had a TD5 before can can't recall the brakes being this dire.....

Thanks

Alternatively, pump the brake pedal a few times with the engine off. Apply pressure to the brake pedal and, whilst keeping the pressure on the pedal start the engine. The brake peadl should go down a bit as the vaccuum builds up in the servo.

HTH.

Mark.
1992 200Tdi 90

#6 Nige P

Nige P

    Member

  • Supporters
  • 47 posts
  • Location:Brummagem

Posted 14 October 2010 - 05:47 PM

Have you got drums or discs on the rear?

Nige

#7 western

western

    Recovery Man

  • Moderators
  • 28,769 posts
  • Location:Cornwall,UK

Posted 14 October 2010 - 06:34 PM

Have you got drums or discs on the rear?

Nige



says it's a 300 tdi so it'll be rear disc brakes :D
Ralph, M3WRM, MSA Recovery Operator -- Western Recovery [Motorsport] http://www.amro.org.uk/
Defender Forum Moderator

Keep LR4x4.com Independent -- you can help by Clicking Here

#8 cypermethrin

cypermethrin

    Member

  • Settled In
  • PipPip
  • 195 posts

Posted 14 October 2010 - 07:17 PM

Yep new discs and pads all round
Land Rover Defender 90 300TDi

#9 cypermethrin

cypermethrin

    Member

  • Settled In
  • PipPip
  • 195 posts

Posted 15 October 2010 - 01:49 PM

Update........ Took the vacuum pipe off the brake servo and there is a very slight negative pressure only enough to just feel it on your index finger

the brake pedal does sink slightly upon start up

left the vacuum pipe off and drove down the lane, and the brakes were no different than before. Does the servo retain the vacuum without the pipe being fixed

am now confused!!
Land Rover Defender 90 300TDi

#10 K88 MUD

K88 MUD

    Old Hand

  • Settled In
  • PipPipPip
  • 312 posts
  • Location:Normaly under a Land Rover

Posted 15 October 2010 - 01:55 PM

Update........ Took the vacuum pipe off the brake servo and there is a very slight negative pressure only enough to just feel it on your index finger

the brake pedal does sink slightly upon start up

left the vacuum pipe off and drove down the lane, and the brakes were no different than before. Does the servo retain the vacuum without the pipe being fixed

am now confused!!


When the vac pipe is removed you loose the vacuum so no servo assist....my guess would be the vac pump needs replacing.
Clevelands only local independant L/R garage with full dealership diagnostics.

www.4x4lrs.com

#11 cypermethrin

cypermethrin

    Member

  • Settled In
  • PipPip
  • 195 posts

Posted 22 October 2010 - 03:32 PM

Well K88 MUD your prognosis that it was the vacuum pump that needed replacing was spot on - many thanks.

It now stops with no problem and very little effort.

Thanks again to all you helpful folk on here.
Land Rover Defender 90 300TDi




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users