Disco 2 Master Cylinder / Servo on a Defender? - Defender Source
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  #1  
Old February 6th, 2016, 07:10 PM
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Disco 2 Master Cylinder / Servo on a Defender?

With the LS conversion nearing completion, it has got me thinking about the brakes. I have a dead Discovery 2 sitting in the work shop so I was wondering if anyone has attempted to fit the much larger booster setup from the Disco into a Defender?

Any thoughts always appreciated

James
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  #2  
Old February 6th, 2016, 07:28 PM
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John B.
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Is the Disco 2 booster larger? Disco 2 brakes are horrible. I can't see how there is space in a Defender for a lager diameter. Disco 1s use a dual diaphragm booster that is a bit more powerful.

What brakes and calipers do you have?
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Old February 6th, 2016, 07:30 PM
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not a good idea. disco firewalls are angled and defender firewalls are orthogonal. youll have to park at an incline to fill the reservoir
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Old February 6th, 2016, 07:34 PM
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Defenders use a 10" booster. Earlier ones use a smaller booster. If you have one of those switch to the newer version.
Brake Booster: LANDROVER STC4322 -compatibility, features, prices. Boodmo

Disco 1s use a dual with 8 and 9".
Brake Booster: LANDROVER STC1286 -compatibility, features, prices. Boodmo

Looks like Disco 2s use the same size.
Brake Booster: LANDROVER SJG000040 -compatibility, features, prices. Boodmo
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Old February 6th, 2016, 07:36 PM
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Quote:
Originally Posted by robertf View Post
not a good idea. disco firewalls are angled and defender firewalls are orthogonal. youll have to park at an incline to fill the reservoir
That is set by the brake box, not the booster.
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Old February 6th, 2016, 07:38 PM
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Cool, My defender is at the exhaust shop so I could not compare! The D2 booster is a monster double diaphragm type probably to try and get the horrid single pot sliding type front cylinders to stop the rolling mass of a D2!
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Old February 6th, 2016, 07:43 PM
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Okay. It should be bigger. Assuming the numbers are right 8+9 is 45% larger than a single 10. Not sure a double uses the whole area though.

Make sure you have the larger (46 mm) pistons on the front calipers for sure. Earlier 90s came with 41 mm.
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Old February 6th, 2016, 07:47 PM
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I think I may have a play, got nothing to loose really. Thankfully the 50th Anv Defenders came with the vented discs and large calipers anyway...
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Old February 6th, 2016, 07:52 PM
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Let us know how it goes.

A little Google says it might be too long. Not sure why as there looks to be enough space on my truck.

http://www.defendersource.com/forum/...rrc-19159.html
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Old February 6th, 2016, 08:31 PM
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Will do. I may pull the assembly out of the D2 later. Am guessing that there could be significant rhd / lhd differences.
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Old March 14th, 2016, 02:38 AM
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OK so I finally got to look at this and the results are that the defender MC bolts directly upto the disco servo and with a bit of filing the booster fits to the defender peddle box. On the rhd at leat space is not an issue. Unfortunately the actuator is about 10mm to short thus limiting pedal travel. I don't think that this is safe and I don't think the input shaft can be changed so it's probably game over. Oh well some one had to try it...

20160314_172327 by James Elphick, on Flickr
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