Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: Aislingean on October 02, 2011, 02:47:11 PM

Title: Help with WJ brakes .... What is this?
Post by: Aislingean on October 02, 2011, 02:47:11 PM
After three years continuous use the WJ 4.7 v8 failed MOT
Upper control arm bushes and two tie rod ends from pitman arm to ns knuckle..... no problems  :098:
I then started a minor brake service that has turned into a major rebuild!   :banghead:
How it passed last two years who knows? Serious problems at the back on near side!
Long story short!
New discs all round, new pads and parking brake shoes/ small parts, new rear ns calliper and new front to back pipe work [cunifer].
The flexy hoses are being salvaged.
Now the questions .......
The rear mid flexy attached to the upper control arm terminates in the connector block on top of the axle and the left and right pipes connect here but there is also a rubber pipe comes off the connector [crimp connection] and disappears up toward the petrol filler where it flops about unsecured with what looks like a plastic valve thing in the end ????? [Technical speak!]
I have read the service manual end to end and can find no mention and no pictures.......
WTF is that pipe?  + How is the connector fastened to the axle case?
When I cut out the old steel lines will the connector block fall loose?

The old rear left and right pipes are steel wire wrapped [stiffness? Stone protection?] and the new needs securing to the axle. Are there any [MOT approved] recommendations for clipping / pipe saddles and or reinforcement / protection for cunifer ????

I need you guys !
Cheers
Dave
Title: Re: Help with WJ brakes .... What is this?
Post by: JamesH on October 02, 2011, 02:49:37 PM
The pipe is the breather tube for the rear axle.
Title: Re: Help with WJ brakes .... What is this?
Post by: Aislingean on October 02, 2011, 03:12:35 PM
Thank you!!!!
Light is now showing at tunnel's end!
Title: Re: Help with WJ brakes .... What is this?
Post by: Lornaben on October 02, 2011, 03:16:14 PM
Quote from: Aislingean on October 02, 2011, 03:12:35 PM
Light is now showing at tunnel's end!


Just be careful it aint a train coming  :003:
Title: Re: Help with WJ brakes .... What is this?
Post by: daggie on October 02, 2011, 03:46:48 PM
pull that tube off, 15mm spanner and off the block comes, too
Title: Re: Help with WJ brakes .... What is this?
Post by: Aislingean on October 02, 2011, 09:10:35 PM
Quote from: daggie on October 02, 2011, 03:46:48 PM
pull that tube off, 15mm spanner and off the block comes, too

Thanks for this welcome news!

 :13:
Title: Re: Help with WJ brakes .... What is this?
Post by: Dave69 on October 03, 2011, 07:38:49 PM
brake pipe wire wrap covering is more of a trap to promote brake pipe rotting than it's protective intention
Title: Re: Help with WJ brakes .... What is this?
Post by: Aislingean on October 09, 2011, 10:50:45 PM
Replaced brake lines,  parking shoes, springs and retainers, discs pads and one caliper with chunk out of piston that was sticking......
Sucked through the fluid and bled brakes ..... All seemed fine !
Road test nice positive braking then  ......... The Smell!
Offside rear caliper now seized!

Popped out piston removed seal ....Both looked fine but Piston is tight in bore near top when pushed back?
I read on several USA sites that phenolic pistons swell over time as they absorb water? [5 year life most say?]
A clean and a hone seems to have eased things however I will test tomorrow and order new pistons and seals.
Worst brakes I have ever worked on  :die:
Title: Re: Help with WJ brakes .... What is this?
Post by: Aislingean on October 10, 2011, 08:42:36 PM
Thanks all !
I am happy to announce that the Jeep passed it's MOT today!
Brakes now all OK!
One advisory .... slight oil leak!
I must look for a decent sump pan!!

 :singing:
Title: Re: Help with WJ brakes .... What is this?
Post by: Jeepjedi on October 13, 2011, 11:56:12 AM
Good to know, Just Empty Every Pocket, but we all know the reason we own them,  :greggmo: