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Thread: Brake upgrade for Discovery 2?

  1. #1
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    Question Brake upgrade for Discovery 2?

    Are there any serious brake upgrades for the Discovery 2?

    I know the later D2a's had improvements to the front callipers and brake master cylinder. There's always the simple aftermarket upgrades like brake rotors and pads:






    But is there any serious brake upgrades? Larger callipers? More pistons? Larger rotors?

    With the larger tyres, added weight of the equipment on the vehicle, height increases etc., it definitely puts a lot more strain on the brake system.

  2. #2
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    are the pistons stuck on that one?

  3. #3
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    discs and calipers are available from places like these:

    Wilwood High-Performance Disc Brakes - Calipers

    Brembo Aftermarket Catalogue

    If you cant do Disco 2 parts try Range Rover P38. You could speak to your mechanic.
    Quote Originally Posted by benji View Post
    ........

    Maybe we're expecting too much out of what really is a smallish motor allready pushing 2 tonnes. Just because it's a v8 doesn't mean it's powerfull.

    One answer REV IT BABY REV IT!!!

  4. #4
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    I recently fitted cross drilled/slotted rotors and they seem better.They were never poor to start with.
    I suggest you flush your brakes at least once a year.If you have a nannycom or can borrow one its a VERY easy job.
    If not,search on AULRO there are methods of getting the ABS system to run whilst bleeding like Nannocom does.
    I find mine do get spongy over time,I simply flush them on an annual basis and they are good again.
    Andrew
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  5. #5
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    Quote Originally Posted by LandyAndy View Post
    If not,search on AULRO there are methods of getting the ABS system to run whilst bleeding like Nannocom does.
    Like this possibly......

    http://www.aulro.com/afvb/discovery-...akes-solo.html

    Regards
    Andrew

  6. #6
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    If the std brakes are good for the full gvm plus 3000 kgs pushing on the towbar I wouldn't worry. Take a series 3 swb for a drive down a long winding hill, then you would consider better brakes

    Regards Gordo Sent from my iPhone using Forum Runner

  7. #7
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    Quote Originally Posted by twr7cx View Post
    Are there any serious brake upgrades for the Discovery 2?

    I know the later D2a's had improvements to the front callipers and brake master cylinder. There's always the simple aftermarket upgrades like brake rotors and pads:
    It looks like the D2 has 2 different front calipers (early 48mm, late 45mm) and the brake master cylinder is the same for all D2. (thanks Rick130!)
    From what I can calculate, for a given line pressure the early caliper gives about 13.7% increased clamping pressure.

    Does anybody know what the difference is between the early and late Disco2 brake booster by any chance?
    Did the later brake booster increase brake line pressure to compensate for reduced piston size in the calipers?

    It may be easy to see where I'm going with this.
    Cheers
    Slunnie


    ~ Discovery II "Storm" ~ ~ Series IIa 6cyl ute ~ ~ Series II V8 ute ~

  8. #8
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    Quote Originally Posted by Slunnie View Post
    It looks like the D2 has 2 different front calipers (early 48mm, late 45mm) and the brake master cylinder is the same for all D2. (thanks Rick130!)
    From what I can calculate, for a given line pressure the early caliper gives about 13.7% increased clamping pressure.

    Does anybody know what the difference is between the early and late Disco2 brake booster by any chance?
    Did the later brake booster increase brake line pressure to compensate for reduced piston size in the calipers?
    I can't offer anything on what you've raised, but I'm interested so thought I would consult Microcat for the D2 part listings for clues. To that end I offer the following:

    There's a wide variety of part numbers listing for the D2 range:

    Master Cylinder Assembly Brake:

    SJC100430 [ - (V)XA222500 ] - doesn't seem to have any third party versions of this part number, only genuine lists and alternative part numbers (SJC100430, SJC100432 and SJC000110)
    SJC100431[ (V)XA222501 - (V)XA232916 ] - Microcat lists as superseding SJC100430. Doesn't list with suppliers only alternative part numbers (SJC100430, SJC100432 or SJC000110)
    SJC100432[ (V)XA232917 - (V)2A999999 ] - Microcat lists as superseding SJC100431. Listed as superseded by SJC100430
    SJC000110[ (V)3A000000 - ] - Microcat lists as superseding SJC100432. Looks to be available for purchasing

    SJC100440[ - (V)XA222500 ]- doesn't list with suppliers only alternative part numbers (SJC000100 or SJC100442)
    SJC100441[ (V)XA222501 - (V)XA232916 ] - suppliers cross referencing to SJC000100 and SJC100442
    SJC100442[ (V)XA232917 - (V)2A999999 ] - Microcat lists as superseding SJC100440 and SJC100441. Suppliers list as superseded by SJC000100
    SJC000100[ (V)3A000000 - ] - looks to be available for purchasing

    You are perhaps onto something in that there seems to be two different ranges of Master Cylinder Assemblies that in their most recent part number result in SJC000100 (for later vehicles) and SJC000110 (for earlier vehicles). Perhaps their difference is the line pressure as you've suggested?


    For the front disc brake callipers:

    STC1915 [ - (V)2A999999 ] (also used on Range Rover 1994 - 2001 (P38 I assume?))
    STC1916 [ - (V)2A999999 ] (also used on Range Rover 1994 - 2001 (P38 I assume?))

    SEG000060
    [ (V)3A000000 - ]
    SEG000030 [ (V)3A000000 - ]

    Two very distinct part numbers there for the earlier and later vehicles. All four still seem to be available from suppliers and cannot find any information on being able to exchange them between vehicles.


    Front caliber pistons:

    STC1918 [ - (V)2A999999 ] (also used on Discovery 3, 4, Range Rover from 1994 - 2001 (P38 I assume?), Range Rover from 2002 - 2009 and Range Rover Sport from 2005 - 2009 - perhaps used in the rear in some of the later applications as brakes generally enlarged over the years?)SEK000020 [ (V)3A000000 - ] (not listed for any vehicles other than Discovery 2)

    Again two very different part numbers series with no information about being cross compatible - emphasised further that only STC1918 lists for the other vehicle models. Both still seem to be available from suppliers.


    Brake pads:

    SFP000210 [ - (V)2A769216 ]
    SFP500150 [ (V)2A769217 - ] which according to Microcat superseded SFP000210

    So all used the same front brake pads regardless of which callipers are fitted.


    For the sake of completeness I also checked out the rears:
    STC1905 for LH
    and STC1906 for RH
    regardless of VIN so same same all the way through - which means that later vehicles may have more rear brake bias if they're running higher line pressures with the same rear callipers as the earlier vehicles?


    Quote Originally Posted by Slunnie View Post
    It may be easy to see where I'm going with this.
    The higher pressure later brake master cylinder fitted with earlier larger piston brake callipers perhaps?


    It's very strange that they downgraded the front brake callipers in the later vehicles, especially when the earlier setups piston were continued with in other model vehicles...
    Mine - modified MY03 LT L318 Discovery 2a HSE Td5 15P
    Hers - MY12 L319 Discovery 4 2.7L TDV6
    Dads - MY98 LJ Discovery ES 3.9L V8

  9. #9
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    from what i read-- I think its due to ABS software..
    maybe,, happy to be shot down..
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  10. #10
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    Quote Originally Posted by twr7cx View Post
    I can't offer anything on what you've raised, but I'm interested so thought I would consult Microcat for the D2 part listings for clues. To that end I offer the following:


    The higher pressure later brake master cylinder fitted with earlier larger piston brake callipers perhaps?


    It's very strange that they downgraded the front brake callipers in the later vehicles, especially when the earlier setups piston were continued with in other model vehicles...
    Thats a huge amount of information! A massive thanks, because it also clarifies a lot of info including the multiple codes used and the inter-relationships between the codes.

    Both of our info combined and little bit added to it, from what I can work out:

    I've used MY03+ to represent VIN 3A0000000+ and also D2 for up to VIN 2A99999999

    Brake Power Booster:
    SJG500020-RHD /SJG500030-LHD is MY03+
    SJG000040-RHD /SJG000050-LHD is D2
    Not sure of the differences between D2 and MY03+

    TRW SJB000161 I saw on an australian part label and with a google search there are a whole lot more, also with Lucas and TRW - do you know the cross-matched/superceded codes by any chance for the boosters???

    Brake Master Cylinders are the same throughout, with the codes being:
    SJC000100 for RHD
    SJC000110 for LHD
    I assume they are sided for the line output.

    Front disc calipers:
    SEG000030 is MY03+ RHF Caliper 45mm piston
    SEG000060 is MY03+ LHF Calper 45mm piston
    STC1915 is D2/P38 LHF Caliper 48mm pistons
    STC1916 is D2/P38 RHF Caliper 48mm pistons

    Pistons:
    SEK000020 is MY03+ 45mm
    STC1918 is D2/P38 48mm

    Pads:
    All D2 are the same.

    Rear calipers:
    All D2 are the same.
    STC1905 for LH
    STC1906 for RH


    But absolutely, I'm trying to work out if the update D2's had smaller front caliper pistons, the Master cylinder is the same, if they upped the pressure in the revised brake booster. The newer calipers should be about 13.7% I think it was reduced in clamping pressure, so does the new booster subsequently increase the line pressure to suit and retain or improve brake clamping pressure. Then, if the update Booster did up the line pressure, if it will work with the earlier calipers to increase brake clamping pressure further. My feeling is that this may be the case, but I'm unaware of anybody running early calipers with a late booster to improve the brakes. Interestingly there was some talk in another thread questioning if this change was done to reduce the brake pedal spongyness and travel in the Disco2.
    Cheers
    Slunnie


    ~ Discovery II "Storm" ~ ~ Series IIa 6cyl ute ~ ~ Series II V8 ute ~

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