Brake upgrade - master cylinder?

LowDown · 07-02-2002, 08:14 AM

I'm upgrading to 73mm calipers in the front (rear stays stock for now). Will the stock reservoir be big enough to handle the new calipers?

LowDown · 07-03-2002, 03:30 AM

anyone???

cyberstang5.0 · 07-03-2002, 07:17 AM

yes, the resivor will be big enough to handle the bigger calipers.

DZEE'S LX · 07-03-2002, 02:20 PM

It will hold enough fluid. Your m/c piston will have to move a bit more fluid to fill the larger dia calipers but you should be fine. Never hurts to check though....
Usually people start changing master cylinders, lines, and valving when going to disks on the rear.

drudis · 07-03-2002, 02:32 PM

Yes, will have enough reservoir...

FYI:
Model Fast-Fill Bore Dia. Primary L Primary R Rear
93 Cobra No 1" 12mm-1 ISO 10mm-1ISO
87-93 5.0L Yes 21mm 12mm-1 ISO 12mm-1 ISO 10mm-1ISO
86 5.0L Yes 21mm 9/16-18 SAE 1/2-20SAE
SVO No 1.125" 9/16-18 SAE 7/16-24SAE
94-01 Cobra No 15/16"
95 Cobra R No 1"
00 Cobra R No 1"
M-2300K kit No 1"
Lincoln No 1.125" 9/16-18 SAE 7/16-24 SAE
93 Cobra R No 1"

flyin 5.8 · 07-03-2002, 09:00 PM

You can use the stock master cylinder but I've heard that pedal travel will increase about 25%(?). The web site I found (can't remember it now but I copied the text for future reference) says the '86 lincoln m/c (wagner # R105806) is basicly the same as the SVO unit and will bring the pedal back up.

LowDown · 07-09-2002, 02:08 AM

Thanks for the replies, guys. I'm going to throw on the new calipers this weekend and see how the pedal feels. I just wanted to be sure I was going to have enough pressure to stop my car. Didn't want to change calipers and then find out that I have to let my car sit until I could get a new mc.

avbcon12 · 07-09-2002, 08:04 AM

i have heard it being done without changing MC's but i would highly recomend gettina a MC. with 73MM calipers and stock MC you will have 48% (!!!) more pedal travel than stock. which is never good. get a 94 GT MC and youll be all set...
im doing it this weekend.
http://svo73mm.cjb.net/
take care,
adam

07-02-2002, 08:14 AM	#1
LowDown Registered Member Join Date: Sep 2001 Location: Germany Posts: 91	Brake upgrade - master cylinder? I'm upgrading to 73mm calipers in the front (rear stays stock for now). Will the stock reservoir be big enough to handle the new calipers? __________________ What?

07-03-2002, 03:30 AM	#2
LowDown Registered Member Join Date: Sep 2001 Location: Germany Posts: 91	anyone??? __________________ What?

07-03-2002, 02:20 PM	#4
DZEE'S LX Registered Member Join Date: Jan 2001 Location: Salt Lake City Posts: 117	It will hold enough fluid. Your m/c piston will have to move a bit more fluid to fill the larger dia calipers but you should be fine. Never hurts to check though.... Usually people start changing master cylinders, lines, and valving when going to disks on the rear. __________________ Spec Service (UHP), BFG G-Force KDW's, Turbo Coupe 3.55 rear w/disks, 73mm calipers, Stg 1 Twisted Wedges, TFS Street Intake, 70mm TB, E cam, Crane 1.7's, Aeromotive FPR, BBK 1 5/8 shorties, elec fan, FMS Al Radiator, Moroso Wires, Kenne Bell Ramair, March pulleys, Race Magnums, 190 lph Walbro, FMS Al Dshaft, D/S loop, MM 4point rollbar, FMS C spngs, strut tower brace, Tokico Illuminas, Prothane bushings, MM Lwr Conrol Arms, KB welded subs, Cervini Mach 1 hood/valence/side skirts/wing/airdam.

07-03-2002, 02:32 PM	#5
drudis Moderator Join Date: Dec 1999 Location: Livonia, MI, USA Posts: 1,194	Yes, will have enough reservoir... FYI: Model Fast-Fill Bore Dia. Primary L Primary R Rear 93 Cobra No 1" 12mm-1 ISO 10mm-1ISO 87-93 5.0L Yes 21mm 12mm-1 ISO 12mm-1 ISO 10mm-1ISO 86 5.0L Yes 21mm 9/16-18 SAE 1/2-20SAE SVO No 1.125" 9/16-18 SAE 7/16-24SAE 94-01 Cobra No 15/16" 95 Cobra R No 1" 00 Cobra R No 1" M-2300K kit No 1" Lincoln No 1.125" 9/16-18 SAE 7/16-24 SAE 93 Cobra R No 1" __________________ Darius Rudis, Moderator Corner Carvers Delight 1989 Mustang LX - Open Track Car http://www.dariusrudis.com

07-09-2002, 02:08 AM	#7
LowDown Registered Member Join Date: Sep 2001 Location: Germany Posts: 91	Thanks for the replies, guys. I'm going to throw on the new calipers this weekend and see how the pedal feels. I just wanted to be sure I was going to have enough pressure to stop my car. Didn't want to change calipers and then find out that I have to let my car sit until I could get a new mc. __________________ What?

07-03-2002, 07:17 AM	#3
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	yes, the resivor will be big enough to handle the bigger calipers.

07-03-2002, 09:00 PM	#6
flyin 5.8 Registered Member Join Date: Apr 2002 Location: Holland, Michigan Posts: 73	You can use the stock master cylinder but I've heard that pedal travel will increase about 25%(?). The web site I found (can't remember it now but I copied the text for future reference) says the '86 lincoln m/c (wagner # R105806) is basicly the same as the SVO unit and will bring the pedal back up.

07-09-2002, 08:04 AM	#8
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	i have heard it being done without changing MC's but i would highly recomend gettina a MC. with 73MM calipers and stock MC you will have 48% (!!!) more pedal travel than stock. which is never good. get a 94 GT MC and youll be all set... im doing it this weekend. http://svo73mm.cjb.net/ take care, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

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