[90maniac]

i have an 86 90 with rear drums and i have a an old v8 discovery with disc axles is this a big job to change the rear axle to a disc one and do i need to change the brake servo or any of the piping
cheers

 

[jamesmartin]

only the rear brake pipes

 

[90maniac]

how long of a job is it??

 

[jamesmartin]

mornings work probably but can be done in less than an hour

 

[90maniac]

so all i need is to get some new pipes made or can i use the ones already on my disco axle??

 

[jamesmartin]

you may get away with the disco pipes if still fitted and disconnected at t piece but are often are in poor condition or butchered when people remove axles

 

[90maniac]

ahhh right you seee i have the full car i am wanting the engine and gearbox to go into mine so hopefully if they are in good nick ill just slam them on

 

[td5tool]

are the diff ratios the same?
im looking to do this to mine sometime

 

[jamesmartin]

all discos 1s and defenders are 3.54 ratio ,unless a special build

 

[Retroanaconda]

An early Disco 1 might have imperial (3/8" UNF) brake fittings, whereas all 90/110/Defender have metric (10mm) fittings, so if there's a difference you may need to swap pipes or at least pipe ends over.

If the brake fittings are imperial on the axle then the rest of it will be as well most likely (caliper bolts are hex-headed rather than bi-hex, and drive member bolts are 5/8" AF I think rather than 17mm on the later metric Disco axles and all 90/110/Defender axles). Not that any of that affects it, but might give you an indication of what to expect. Think the Discos went metric in the nineties somewhen, late 200Tdi era rings a bell.

 

[jamesmartin]

they both use metric fittings iirc although early discos use hex imperial caliper securing bolts ,and later use bihex caliper bolts

 

[jai_landrover]

To do it properly you *should* change your master cylinder to get the correct matched type NOBODY does this and I suspect that if you were in a serious accident you could well get fooked over if somone (Unlikley) was to spot that its been swapped out.


Dia and volume of brake components are worked out for a reason. For drum brakes you Generally need to move more volume of fluid in a couple of wheel cylinders compared to 2 calipers hence the huge master cylinder dia.

 

[Retroanaconda]

To do it properly you *should* change your master cylinder to get the correct matched type NOBODY does this and I suspect that if you were in a serious accident you could well get fooked over if somone (Unlikley) was to spot that its been swapped out.


Dia and volume of brake components are worked out for a reason. For drum brakes you Generally need to move more volume of fluid in a couple of wheel cylinders compared to 2 calipers hence the huge master cylinder dia.

All non-ABS 90/110 from 1991 to present day have used the same master cylinder, irrespective of the type of rear brakes. Rear discs only came in in 1993/1994.

So there's no need to change the master cylinder when converting a post-1991 Defender to rear discs. If it's before that date then it might be worth it, as they used the older type as found in late Series III and were different between 90 and 110 models.

they both use metric fittings iirc although early discos use hex imperial caliper securing bolts ,and later use bihex caliper bolts

Early Discos definitely had UNF brake pipe fittings, I've had a few axles like that. A hangover from the Range Rover drivetrain, which they never got round to metricating until well after the 90/110 came into being.

 

[jai_landrover]

Earlyier pre HA has a massive master cylinder mine defo has its fookin huge dia

NRC9529G non abs to HA chassis no,

STC4322 Non abs from HA chassis no

 

[Retroanaconda]

That's what I said, all Defenders from 1991 (HA) use the same master cylinder, irrespective of whether they used drums on the rear (1991-1993) or discs (1994-on).

If your 90/110 is pre-1991 then you might want to change it as it uses a different system...as I said above. Different servo as well

STC4322 is the brake servo, the part number for the m/c from HA (1991) onwards is STC441.

 

[Taffy]

Is there a damper in the brake pipe line by the engine bay in disco ?? This stops the rear discs locking up after apply the brakes ?? Take that out and put it in defender for 4 wheel disc. I think there is a damper I might be wrong

 

[chainsaw]

Is there a damper in the brake pipe line by the engine bay in disco ?? This stops the rear discs locking up after apply the brakes ?? Take that out and put it in defender for 4 wheel disc. I think there is a damper I might be wrong

Is there a damper on the disco to stop the rear disc locking up, I was going to do this conversion as well, I have a Disco 300tdi rear axle and was going to fit it to my 200tdi 90. I notice that there is a doughnut on the disco axle output shaft, can the output shaft from the 90 axle be fitted to the Disco axle.

 

[wangie46]

Is there a damper on the disco to stop the rear disc locking up, I was going to do this conversion as well, I have a Disco 300tdi rear axle and was going to fit it to my 200tdi 90. I notice that there is a doughnut on the disco axle output shaft, can the output shaft from the 90 axle be fitted to the Disco axle.

Here ya go av a butchers here http://www.discoweb.org/rotoconversion/index.htm

 

[chainsaw]

Would the diff flange from the 200 Defender rear axle fit on the 300 Disco axle or do I need to get a new one.

 

[wangie46]

Would the diff flange from the 200 Defender rear axle fit on the 300 Disco axle or do I need to get a new one.

yes once 300 flange is removed 200 4 bolt flange fits see above link