salad351 13 Posted April 24, 2016 Hi Guys, Im currently in the process of upgrading my brakes on the XD to a 300mm Hoppers combo and just have a few questions when it comes to the Booster/Master Cylinder combination. I am yet to put the bigger brakes on, however want to achieve optimum Booster/Master combo before i make the swap. Currently i am running the smaller XF single diaphragm booster with a new XF master, this feels pretty good, the car pulls up well but ive found the pedal has quite a bit of travel before the brakes really bite, this isnt an issue as i am used to it and I'd assume standard with a power assisted car. After doing some reading and now acquiring the big brake kit I've been advised against using the XF Booster as it produces the least amount of 'boost'. Would it be better to go back to an XD Booster/Master Combo? Or would it be better sourcing an XG XR Booster with the spacer plate and the later style master (XF Style)? Im guessing anything twin diaphragm (XD/XE/XG) would be better than what i have? Any advice would be much appreciated Thanks Bill Share this post Link to post Share on other sites
SLO247 1,713 Posted April 24, 2016 Are XG different or was that just XG XR? I have two late XF ones and a standard XG one here. I haven't looked real close but they look identical. Share this post Link to post Share on other sites
salad351 13 Posted April 24, 2016 I'm pretty sure it was only the XG XRs and the XGs with the brake upgrade that ran the spacer and later master, and I think some EB/ED V8s Share this post Link to post Share on other sites
bear351c 10,273 Posted April 24, 2016 The diameter of the piston inside the master is where all the work is done. The booster is just that, a booster. Bigger diameter booster, less effort on the pedal by you. The 'low' pedal is probably caused by runout of the disc rotor, (warpage) which 'knocks' the pads back into the calipers when going round and round. Thats why race drivers tap the brake pedal before jumping on it. Puts the pads closest to the rotor. Share this post Link to post Share on other sites
xm-221 1,803 Posted April 24, 2016 Peter from Hoppers Stoppers told me years ago that the XF booster and master were way superior to the XD/E versions, hence the reason it was put on the XD that they did the R&D on their big brake kits with. 1 Thom reacted to this Share this post Link to post Share on other sites
deankxf 20,316 Posted April 25, 2016 I'm pretty sure it was only the XG XRs and the XGs with the brake upgrade that ran the spacer and later master, and I think some EB/ED V8s mine is 20years old(1996 XG XR6..) brakes look and feel the same as a plain XF to Me. that said, they could have been replaced in that time with standard parts. Share this post Link to post Share on other sites
salad351 13 Posted April 25, 2016 Thanks for the input guys, I'm currently in the process of putting the XF gear back on Ahh ok, I think it was only part of the brake upgrade option on the XGs then? Not entirely sure Thanks again guys! Share this post Link to post Share on other sites
Mr Polson 10,214 Posted April 25, 2016 the car pulls up well but ive found the pedal has quite a bit of travel before the brakes really bite, this isnt an issue as i am used to it and I'd assume standard with a power assisted car. Disc/disc or disc/drum? I've got two XFs, one wagon with disc/disc and a ute with disc/drum, and I find the ute has more travel in the brake pedal before biting, the wagon is almost instant brakes as you push the pedal (not unbearably touchy though) Share this post Link to post Share on other sites
SLO247 1,713 Posted April 25, 2016 What's the brake upgrade on an XG? I've never heard of that being an option until AU. Share this post Link to post Share on other sites
salad351 13 Posted April 25, 2016 What's the brake upgrade on an XG? I've never heard of that being an option until AU. I think it was an E-Series option that they carried over, I'll get my workshop manual and take a snap when I get a chance, but it's got something to do with the pads they used, this then had the Dual Diaphragm Booster with the XF Style Master Share this post Link to post Share on other sites
salad351 13 Posted April 25, 2016 the car pulls up well but ive found the pedal has quite a bit of travel before the brakes really bite, this isnt an issue as i am used to it and I'd assume standard with a power assisted car. Disc/disc or disc/drum? I've got two XFs, one wagon with disc/disc and a ute with disc/drum, and I find the ute has more travel in the brake pedal before biting, the wagon is almost instant brakes as you push the pedal (not unbearably touchy though) Disc/Disc setup Share this post Link to post Share on other sites
Banno 479 Posted April 25, 2016 XR8 got the dual diaphragm. Not sure about the XR6. But they were all E-series. EB/ED models with two different sizes 230 mm and 200mm. Not sure which is which As with the XG XR6 not sure but couldn't think it be hard to put an XR8 version in they are all metal but may be different foot pedal arrangement position. Share this post Link to post Share on other sites
deankxf 20,316 Posted April 25, 2016 XR8 got the dual diaphragm. Not sure about the XR6. But they were all E-series. EB/ED models with two different sizes 230 mm and 200mm. Not sure which is which As with the XG XR6 not sure but couldn't think it be hard to put an XR8 version in they are all metal but may be different foot pedal arrangement position. XG has the XF setup.. XH not so sure, XH had the Eseries suspension the V8 had a bigger booster because they had less vacuum than a 6cyl i thought Share this post Link to post Share on other sites
Banno 479 Posted April 25, 2016 I reckon your right about v8 booster. I think all 6 cylinders are the same from xf-xg and e-series regardless xr or not. Not sure about xh never own one probably think it would be the same as it shares the same fire wall?But aren't the ef-el different again made from plastic? Share this post Link to post Share on other sites
deankxf 20,316 Posted April 25, 2016 I reckon your right about v8 booster. I think all 6 cylinders are the same from xf-xg and e-series regardless xr or not. Not sure about xh never own one probably think it would be the same as it shares the same fire wall?But aren't the ef-el different again made from plastic? Mark fitted a new one, (V8 XH) pretty sure its plastic, so not the XF style. Share this post Link to post Share on other sites
deankxf 20,316 Posted April 25, 2016 Hi Guys, Im currently in the process of upgrading my brakes on the XD to a 300mm Hoppers combo and just have a few questions when it comes to the Booster/Master Cylinder combination. I am yet to put the bigger brakes on, however want to achieve optimum Booster/Master combo before i make the swap. Currently i am running the smaller XF single diaphragm booster with a new XF master, this feels pretty good, the car pulls up well but ive found the pedal has quite a bit of travel before the brakes really bite, this isnt an issue as i am used to it and I'd assume standard with a power assisted car. After doing some reading and now acquiring the big brake kit I've been advised against using the XF Booster as it produces the least amount of 'boost'. Would it be better to go back to an XD Booster/Master Combo? Or would it be better sourcing an XG XR Booster with the spacer plate and the later style master (XF Style)? Im guessing anything twin diaphragm (XD/XE/XG) would be better than what i have? Any advice would be much appreciated Thanks Bill looks like we'd be interested in hearing about this spacer plate and XG XR booster.. Share this post Link to post Share on other sites
salad351 13 Posted April 25, 2016 https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcT0ji0H1UEUdlKNk7b6R5pmcrFJRQi8pPPHzJmtgamvoXxXDoDZsul8bNjo (Wouldn't let me post the link as an image) That's just a generic Google Image however the same that was on my dad's XR XG, just with the pink reservoir instead. Are the EB/ED Boosters 3 studs or 4? If 3 it was probably just swapped with one of those before we originally bought it Share this post Link to post Share on other sites
deankxf 20,316 Posted April 25, 2016 https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcT0ji0H1UEUdlKNk7b6R5pmcrFJRQi8pPPHzJmtgamvoXxXDoDZsul8bNjo (Wouldn't let me post the link as an image) That's just a generic Google Image however the same that was on my dad's XR XG, just with the pink reservoir instead. Are the EB/ED Boosters 3 studs or 4? If 3 it was probably just swapped with one of those before we originally bought it interesting, i'd say that pic looks like an XD XE booster with an XF master cyl(may need the spacer for that reason...not sure) not sure on the E series.. another thing to note is the XG XR6 still has the solid rear discs unlike the XE XF era vented rears Share this post Link to post Share on other sites