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Thread: Brake upgrade for Discovery 2?

  1. #11
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    Quote Originally Posted by Pedro_The_Swift View Post
    from what i read-- I think its due to ABS software..
    maybe,, happy to be shot down..
    Was that for all of the changes in the upgrade?
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  2. #12
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    Quote Originally Posted by Slunnie View Post
    Brake Power Booster:
    SJG500020-RHD /SJG500030-LHD is MY03+
    SJG000040-RHD /SJG000050-LHD is D2
    Not sure of the differences between D2 and MY03+
    SJG100250 [ - (V)YA284967 ]
    SJG000050 [ (V)YA284968 - (V)2A999999 ] supersedes SJG100250

    SJG100260 [ - (V)YA284967 ]
    SJG000040 [ (V)YA284968 - (V)2A999999 ] supersedes SJG100260

    SJG500030 [ (V)3A000000 - ]

    SJG500020 [ (V)3A000000 - ]


    Quote Originally Posted by Slunnie View Post
    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part label and with a google search there are a whole lot more, also with Lucas and TRW - do you know the cross-matched/superceded codes by any chance for the boosters???
    SJB000161 - as you said works with a Google search but doesn't come up in Microcat for any vehicles or list on suppliers websites or even cross reference to anything. Most of the Google results are for used units from wreckers advertising on eBay UK. The code definitely was printed on the label by LR though:


    s-l500.jpg


    Quote Originally Posted by Slunnie View Post
    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.
    Silly me didn't think of need for different LHD and RHD units.


    Quote Originally Posted by Slunnie View Post
    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
    Again, I didn't think about the fact they would need to be different for left and right sides.
    Mine - modified MY03 LT L318 Discovery 2a HSE Td5 15P
    Hers - MY12 L319 Discovery 4 2.7L TDV6
    Dads - MY12 L319 Discovery 4 2.7L TDV6
    Sister-in-laws - MY98 LJ Discovery ES 3.9L V8

  3. #13
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    Quote Originally Posted by twr7cx View Post
    [Snip]
    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...
    Yep, as Nissan went the other way with the TB48 GU, 51mm pistons and 26.99mm M/C and bigger discs vs 48mm pistons on all other GU's (and I think a 25mm M/C?)

    It's the easy brake upgrade for a GU

  4. #14
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    I've read that the D2 calipers flex a bit, but all sliders flex, as do two piece 4 & 6 pot two piece calipers vs monoblocks but you need serious grip to exploit and notice the differences.

  5. #15
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    Quote Originally Posted by twr7cx View Post
    SJG100250 [ - (V)YA284967 ]
    SJG000050 [ (V)YA284968 - (V)2A999999 ] supersedes SJG100250

    SJG100260 [ - (V)YA284967 ]
    SJG000040 [ (V)YA284968 - (V)2A999999 ] supersedes SJG100260

    SJG500030 [ (V)3A000000 - ]
    SJG500020 [ (V)3A000000 - ]




    SJB000161 - as you said works with a Google search but doesn't come up in Microcat for any vehicles or list on suppliers websites or even cross reference to anything. Most of the Google results are for used units from wreckers advertising on eBay UK. The code definitely was printed on the label by LR though:
    Thanks for this! Legend!

    Just trying to piece things together, it looks like SJB000161 must be a RHD as they seem to be advertised in the UK and Aus. Also being TRW I'm assuming it is the later MY03+ version? Would you think similar??
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  6. #16
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    Quote Originally Posted by rick130 View Post
    Yep, as Nissan went the other way with the TB48 GU, 51mm pistons and 26.99mm M/C and bigger discs vs 48mm pistons on all other GU's (and I think a 25mm M/C?)

    It's the easy brake upgrade for a GU
    That'd be a nice way to do it! Its interesting, one of the engineers that I follow on FB was also saying the LC200 has incredible brakes. Both Nissan and Toyota use 4pot fixed rotors which look excellent, but sadly they are different sizes to what can be put on to a D2, both with 32mm thickness rotors. The closest to a setup like that which I can work out is a D2 front end with L322 front rotor which is 344x30 and Audi Q5 3.0TD Brembo calipers which suit 345x30 rotors. But because the height of the L322 rotor is 76mm compared to the D2 rotor height of 91.5mm and the wider nature of fixed calipers, I'm not sure if they will fit behind standard D2/P38 18" rims without hitting the spokes. I'm also not sure because I think the Q5 Brembos have 42mm pistons.

    I seriously need a set of test axles.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  7. #17
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    Quote Originally Posted by Slunnie View Post
    That'd be a nice way to do it! Its interesting, one of the engineers that I follow on FB was also saying the LC200 has incredible brakes. Both Nissan and Toyota use 4pot fixed rotors which look excellent, but sadly they are different sizes to what can be put on to a D2, both with 32mm thickness rotors. The closest to a setup like that which I can work out is a D2 front end with L322 front rotor which is 344x30 and Audi Q5 3.0TD Brembo calipers which suit 345x30 rotors. But because the height of the L322 rotor is 76mm compared to the D2 rotor height of 91.5mm and the wider nature of fixed calipers, I'm not sure if they will fit behind standard D2/P38 18" rims without hitting the spokes. I'm also not sure because I think the Q5 Brembos have 42mm pistons.

    I seriously need a set of test axles.
    Yep, I'm running 18's atm and just eyeballing, 4 or 6 spots will be a tight fit.
    Up to 345 Rotors won't be an issue though
    I was thinking of measuring to see if we could bore the calipers to 51mm.
    The Nissan blokes reckon the big bore calipers look identical, just a bigger pad is used (that also fits the smaller caliper) and slightly bigger OD rotors

    Oh, and I have multiple tabs open atm on AP Racing's site
    It's all your fault Slunnie!

    I won't do anything though, I need to spend some $$ elsewhere on it atm. Various bits on order and more orders about to happen.

  8. #18
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    Quote Originally Posted by rick130 View Post
    Yep, I'm running 18's atm and just eyeballing, 4 or 6 spots will be a tight fit.
    Up to 345 Rotors won't be an issue though
    I was thinking of measuring to see if we could bore the calipers to 51mm.
    The Nissan blokes reckon the big bore calipers look identical, just a bigger pad is used (that also fits the smaller caliper) and slightly bigger OD rotors

    Oh, and I have multiple tabs open atm on AP Racing's site
    It's all your fault Slunnie!

    I won't do anything though, I need to spend some $$ elsewhere on it atm. Various bits on order and more orders about to happen.
    Sorry!

    Check out AP's CP5100 which is sized for a front standard rotor. 4 pot fixed caliper. Looks like its made for the D2 with OE being 297x25! It'd also be interesting to compare it to the Disco1/Def 4pot fixed calipers for the ventilated rotors.
    CP5100 Family - 130mm Mounting Centres - Suits OE295x25.4mm Discs | AP Racing

    What makes it hard to get good brakes is that LandRover use unconventional rotor thicknesses when compared to regular high performance brakes.

    I'd be interested to hear what you think about boring the caliper!
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  9. #19
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    From memory the Defender uses 48mm pistons?

    I was thinking of 330+ rotors with custom top hats to get the offset I wanted, but it all comes down to what will fit inside the wheel.
    Crazy thinking as my rotors, pads, hoses aren't even twelve months old.
    Switch off the brain, Ricardo....

    At least the new braided body/chassis hoses I have could be reused! Brake upgrade for Discovery 2?Brake upgrade for Discovery 2?

  10. #20
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    Quote Originally Posted by rick130 View Post
    From memory the Defender uses 48mm pistons?

    I was thinking of 330+ rotors with custom top hats to get the offset I wanted, but it all comes down to what will fit inside the wheel.
    Crazy thinking as my rotors, pads, hoses aren't even twelve months old.
    Switch off the brain, Ricardo....

    At least the new braided body/chassis hoses I have could be reused! Brake upgrade for Discovery 2?Brake upgrade for Discovery 2?
    Defender calipers would be the most elegant option for factory rotors.

    I'd never thought of custom tophats or tophats to suit. I just thought when adapting the caliper to fit to setup the caliper offset there.

    My feeling is that you could run up to around 350mm rotors with the 18's. This is bang on for using D4 rears and I suspect the calipers will almost match. Hmmm, maybe even L322 345mm fronts and D4 350mm rears with possibly D2 MY03+ booster could give significantly better braking, all still with sliding brake calipers.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

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