gorganl2000 Posted July 18, 2016 Share Posted July 18, 2016 i have two questions...hopefully someone knows the answers 1) by any chance is there a bigger brake master cylinder that is a direct fit for the EP91 (has 2 holes to fit on to the servo)the stock one is 13/16 (abs) so looking for anything between 7/8, 15/16/, 1 inch 2) what size brake master cylinder does the twin pot levin or/and celica carry as standard? any assistance would be appreciated Quote Link to post Share on other sites
morgey Posted July 18, 2016 Share Posted July 18, 2016 Can check the levin one tonight as got one at home. Is there a marking on it i need to look for or a case of measuring part of it? Quote Link to post Share on other sites
gorganl2000 Posted July 18, 2016 Author Share Posted July 18, 2016 i would appreciate that morgey the size is usually imprinted/stamped somewhere on the cylinder itself (the shiny/aluminium piece with the brake lines going to it)....so when you need to buy a repair seal kit the owner knows the size you should see something along the lines of 13/16,... 7/8....15/16...1....1 & 1/16....... indicating the exact size Quote Link to post Share on other sites
morgey Posted July 18, 2016 Share Posted July 18, 2016 Ae111 bzr (1998) abs twinpots is 7/8". 2 holes onto the servo.Edit:correction of size Quote Link to post Share on other sites
gorganl2000 Posted July 18, 2016 Author Share Posted July 18, 2016 thanks so much morgey see PM Quote Link to post Share on other sites
jayc-glanza17 Posted July 18, 2016 Share Posted July 18, 2016 Be nice to know if their is a larger servo/master cylinder can fit a glanza.As mine is playing up. Quote Link to post Share on other sites
RobSR Posted July 18, 2016 Share Posted July 18, 2016 You can modify a 2zz unit, i just gave mine away with the car when the new owner collected tho! Quote Link to post Share on other sites
gorganl2000 Posted July 19, 2016 Author Share Posted July 19, 2016 from what i can tell from investigations...seems the toyota corolla/levin is a possible match up didnt some paseo come with 7/8 as well? a lot of them seem to have the two lines run almost the same spots/angles as the ep82/91----but you still have to be careful not to go too big...i suspect 7/8 to 15/16 maybe ok, but 1' maybe pushing it as i see that size on bigger pick-ups/suvs Quote Link to post Share on other sites
5e colin Posted July 19, 2016 Share Posted July 19, 2016 i will be watching this thread closely tryed doing some research on it last year but never went anywhere with it Quote Link to post Share on other sites
gorganl2000 Posted July 19, 2016 Author Share Posted July 19, 2016 what size Brake master cylinder did the EP82 (non abs and ABS) come with? did all EP91 come with abs? thanks to morgey...i found out the toyota levin ae111 that comes with twin pot calipers and ABS, carries a 7/8 brake master cylinder (BMC) as standard...from my past investigations, the twin pots from the Celica st202 are also the same (or very close) as the levin twin pots.in the past, i've heard some persons say they experience a slightly softer brake pedal when upgrading to these bigger twin pot calipers over the stock units...and it seems logical in terms of pressure vs fluid movement my ep91 came standard with abs and 13/16 BMC...i installed the twin pot calipers and astra discs recently and the pedal has more travel now---they are a great brake upgrade i must admit...however, i absolutely do not like the softer/longer brake pedal feel...and before anyone says, it may need bleeding, etc...i'm meticulous when it comes to this kind of stuff, so it was done properly...in fact it was bled more than once, as i even installed new brake master cylinder kit shortly afterwards (as i thought it may be failing, but got the same effect) my aim is to try the 7/8 once i can find it locally...and see how it feels while researching the last few days...a few 15/16 and 1' BMCs look like they may also fit our cars...as many share the top and side brake line connections and two bolt connection (these all looks to be in the same place or very close). however, i suspect 15/16 maybe possible, but 1" is maybe too big as i said above ---leading to a very hard brake pedal and less effective braking Quote Link to post Share on other sites
jayc-glanza17 Posted July 19, 2016 Share Posted July 19, 2016 So a celica say st202 might fit?Is very interesting.My issue is my servo is most likely faulty so if theirs a upgrade of sorts then well worth some research.I did hear that yaris ones could fit a few years ago.. Quote Link to post Share on other sites
Ollieh17 Posted July 19, 2016 Share Posted July 19, 2016 Have you worked out the difference in the piston surface areas? Quote Link to post Share on other sites
jayc-glanza17 Posted July 19, 2016 Share Posted July 19, 2016 Good point ollie Quote Link to post Share on other sites
Amjad Posted July 19, 2016 Share Posted July 19, 2016 Interested in this too Quote Link to post Share on other sites
richardc9052 Posted July 20, 2016 Share Posted July 20, 2016 Also interested Quote Link to post Share on other sites
gorganl2000 Posted July 20, 2016 Author Share Posted July 20, 2016 (edited) Have you worked out the difference in the piston surface areas? i had it before,,,but will work it out now again...give me a few mins ok..stock piston i believe is 51mm diameter...so 22/7 x 25.5 x 25.5 = 2044mm2 approximately twin pots i see are 40.4mm diamater...so (22/7 x 20.2 x 20.2) x 2 = 2565mm2 approximately that's an area difference of 521mm2 or 25.5% increase in piston area over stock another variables to consider maybe the volume of fluid in the back of the caliper, piston length differences, BMC displacement for a given bore size/length, etc in the theory and strictest sense of things, if we consider a 25% increase in BMC bore size, then we would end up at about 1'...however, i believe that is way too big as said before...so maybe its not so directly correlated between the two....plus the levin is a slightly bigger sedan car with ABS (a lot of additional brake piping and abs pump for fluid to flow through), so if 7/8 can work for that, then i see no problem with 7/8 for the ep82/91 if one is running the same brakes----just some simple logic. ...7/8 is about a 10% increase in bore size over stock 13/16. as well, the paseo is also slightly bigger than the ep82/91...again this model with abs is using 7/8 BMC kit from what i gathered...so it points strongly to this size bore being decent for us (in theory...lol) can any one confirm that a paseo with ABS has a 7/8 BMC??----i can only tell from internet research, which we all know how the internet can be for reliable information lol if the paseo has a 7/8 kit...it may well be a direct fit to the ep82/91.........from the pics, the levin kit looks like a close fit too, but different reservoir(i'm not sure if the ep82/91 reservoir can bolt on to the levin cylinder, it maybe possible) Edited July 20, 2016 by gorganl2000 Quote Link to post Share on other sites
gorganl2000 Posted July 21, 2016 Author Share Posted July 21, 2016 can anyone with a 1992/93/94 turbo ep82 tell me what size BMC is in their car? Quote Link to post Share on other sites
mech5107 Posted July 22, 2016 Share Posted July 22, 2016 I have a 17/16 fronm an R34 GTR and know people using 15/16 from Navaras and also Impreza looks like to fit. Pretty much everything with the correct bolt pattern (2 bolt or 4 bolt) would probably fit. Quote Link to post Share on other sites
jayc-glanza17 Posted July 22, 2016 Share Posted July 22, 2016 You using a servo and master cylinder from a gtr r34?The 2zz like rob said above looks a very close fit.Need to lay my hands on one. Quote Link to post Share on other sites
mech5107 Posted July 22, 2016 Share Posted July 22, 2016 Just the master cylinder Quote Link to post Share on other sites
Amjad Posted July 22, 2016 Share Posted July 22, 2016 Has anyone done a servo too? My pedal isn't as hard as I would like. Would a bigger MS alone correct that or would I need a new servo too? Quote Link to post Share on other sites
mech5107 Posted July 22, 2016 Share Posted July 22, 2016 A bigger servo would probably would make the pedal even lighter. You need a bigger master cylinder... but don't overdo it, as the bigger the master cylinder, the bigger the force you need to apply to the the pedal. I would say that the sweet spot for stock gt calipers is 15/16 Quote Link to post Share on other sites
gorganl2000 Posted July 22, 2016 Author Share Posted July 22, 2016 (edited) ok..i just checked my friend's 1992 gt ep82....it has on 7/8 BMC---confirmed (the part number according to toyodiy is 47201-16190) i will try this 7/8 on my own car and see how it feels and report back ---maybe in the next week or two, if time permits i'm kind of in agreement with mech5107 on not going too big....the 7/8 to 15/16 is probably good enough for the twin pot conversion PS another part number 47201-16210...for the paseo BMC seems to be 7/8 in size as well--not confirmed Edited July 22, 2016 by gorganl2000 Quote Link to post Share on other sites
Amjad Posted July 22, 2016 Share Posted July 22, 2016 Thanks guys! Wondering what would be best for a GT running single piston GT4 brakes.. Quote Link to post Share on other sites
jayc-glanza17 Posted July 22, 2016 Share Posted July 22, 2016 How about us guys running 4 pots.lol. Quote Link to post Share on other sites
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