brake assistant
Discussion
Hello. I am just upgrading my S 280 brake -system to the Griff.500 standard...means Sierra cossworth 4x4 vented discs on both axles...,think it could also do with a new brake assistant.Anyone with the perfect idea which one I could take..the originally saab 900 is not longer available! Kind regards Karsten
The Griff 260mm disc and XR 4X4 cpmbo definately fits together. I haven't drivent it yet but can't see any reason why the set up won't work.(Famous last words!!). See my post fro phots and you'd like some morw of thebrake set up just email me. Good luck. Joe
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Just make sure you are talking about xr4x4 calipers only - xr4x4 discs don't work the offset is wrong due to the 4x4 hardware on a sierra.
Discs must be for a 2 wheel drive model, to equal griff spec 260mm discs you need early sierra xr4i or later sierra models with ABS (both are the same disc).
Discs must be for a 2 wheel drive model, to equal griff spec 260mm discs you need early sierra xr4i or later sierra models with ABS (both are the same disc).
Barkychoc said:
Just make sure you are talking about xr4x4 calipers only - xr4x4 discs don't work the offset is wrong due to the 4x4 hardware on a sierra.
Discs must be for a 2 wheel drive model, to equal griff spec 260mm discs you need early sierra xr4i or later sierra models with ABS (both are the same disc).
And the calipers won't work if you put them on the wrong side - ask Steve j Discs must be for a 2 wheel drive model, to equal griff spec 260mm discs you need early sierra xr4i or later sierra models with ABS (both are the same disc).
The master cylinder is in very good condition, only the brake servo has the usually bad points at the bottom ..(rust).....So would my S 280/S1 master cylinder fit any other brake servo? And by the way...the FRONT-discs are FORD sierra 2.0i 4 x 4 (90-93) 260 x24
the rear-discs are Sierra 2.0 i COSWORTH 4 x 4 (90-93) 273 x20 (yes its this dimension...)so i think it could also be well to make this conversion with regulating valves on the master cylinder. Kind regards Karsten
the rear-discs are Sierra 2.0 i COSWORTH 4 x 4 (90-93) 273 x20 (yes its this dimension...)so i think it could also be well to make this conversion with regulating valves on the master cylinder. Kind regards Karsten
ok,thanks for all this help ,GREAT FORUM!!!!!!, I think the best way is to fit the V8 main cylinder and brake servo (no idea which one this could be),I also have no idea how the rear axle brake pressure could be controlled,the rear discs are bigger than the front ones... If only someone had an idea what are the best parts for this conversion.....or best case had done it before....regards karsten
My brake set up is different to yours (273 with AP 4 pots on front and 2wd cossy rears (260mm) ) but so that it can be set up correctly I'm fitting a brake bias valve in the rear line (screw in adjustment to reduce pressure to rears) - I'm going to use mine in motorsport so need this facility - the bias valves are not expensive - see ebay or demon tweaks etc
I've just bought a Fiesta Mk3 servo off ebay for my V8S. The Ford identification lable is still on it and the number is 4049404 89FB-DB. The ever-helpfull TVR Centre (thanks Terry!!) cross-checked the numbers and this corresponds to the TVR number. Hope this helps. The master clyinder I got with the servo has a 22.2mm bore and if anyone wants to know the Ford part number on the plastic tag just let me know. Joe
Edited by v8s4me on Thursday 3rd June 09:11
Edited by v8s4me on Thursday 3rd June 09:12
Time to put my two penny worth in !
Firstly Isn't there already a balance valve of sorts on the bulkhead just behind the servo/master cylinder ?
While the Chim/Griff rear discs are larger diameter than fronts the inner diameter also appears to be larger so pad surface area is actually much less ?
Now the good bit, many years ago at tech. we did a bit about brakes and I seem to recall being taught that the calculation for co-efficient of friction does not include area, therefore for a one off stop little brakes work just aswell as big brakes. the larger areas only come into effect with repeated use because they dissipate heat better ?
So, for normal road use discs like dinner plates and multi pot calipers are really not nesessary (but do look nice).
All that said I have fitted Griff discs all round on my S3. one for the challenge, and two because they look better than drums but can honestly say brakes are no better than standard but should I ever venture into the world of trackdays perhaps I'll reap the benefits ?
Stands back and waits to be shot down in flames .........
Firstly Isn't there already a balance valve of sorts on the bulkhead just behind the servo/master cylinder ?
While the Chim/Griff rear discs are larger diameter than fronts the inner diameter also appears to be larger so pad surface area is actually much less ?
Now the good bit, many years ago at tech. we did a bit about brakes and I seem to recall being taught that the calculation for co-efficient of friction does not include area, therefore for a one off stop little brakes work just aswell as big brakes. the larger areas only come into effect with repeated use because they dissipate heat better ?
So, for normal road use discs like dinner plates and multi pot calipers are really not nesessary (but do look nice).
All that said I have fitted Griff discs all round on my S3. one for the challenge, and two because they look better than drums but can honestly say brakes are no better than standard but should I ever venture into the world of trackdays perhaps I'll reap the benefits ?
Stands back and waits to be shot down in flames .........
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