I've searched...no answer on 5 lug swap...

93project

Active Member
Apr 21, 2009
549
50
38
El Paso, tx
Guys, I've been searching for an answer here and haven't found what I needed so here goes....

I just got the 93 GT running with 02 spindles(track width I know), 02 ball joints, and PBR calipers up front, Ranger rear drums. Couldn't afford 4w disc just yet...
Now, The car will stop if I push the pedal to the floor but it does not respond like its supposed to if I do a hard emergency stop. It crawls to a stop..
I bled the lines as much as possible and still no change. I saw a thread about air being trapped in the caliper but these PBR's have their bleeders up high. I have a stock booster, brand new 93 master cylinder and I just changed and bled the rear drums and cylinders with no change.
A buddy of mine says the left caliper isn't holding pressure like it should so I'm changing it tomorrow but I doubt this will help. I know I didn't properly bench bleed the MC so I have someone else do that for me with a new MC. Still no change. All I did was replace the steel lines from the master and the prop valve going to each front caliper, new calipers, new rubber lines up front and new wheel cyls in back.
Is there anything I should have done? Changed that I didn't? Bled better?
I'm stuck! :bang:
 
  • Sponsors(?)


wewfords

Member
Feb 2, 2011
36
0
6
niles mi
one forum i read said that u have to change the master for 02 brakes b/c the master is differnet due to the bigger brakes than the 93 set up
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,053
9,196
224
Massachusetts
Unless you change to rear disks, there is no correct mc to use.


With engine off...pump the pedal. Does it get hard as a rock? If so, no air in lines.

How's does the pedal feel when you hit the brakes? Mushy? Soft? Goes to floor?
 

bdurham

New Member
Sep 9, 2010
3
0
0
brakes

Are your drum brakes set right.. If they are too far away from the drums you can't set them. Ben
 

old_blue

10 Year Member
Nov 3, 2003
1,813
307
124
stock MC is fine with rear discs. I know the bleeder is higher but air can be trapped in there. Try tapping it with the wood end of the hammer while you are bleeding it to see if air comes out. otherwise you'll have to **** it to where the bleeder is the highest point. good luck.
 

93project

Active Member
Apr 21, 2009
549
50
38
El Paso, tx
Thanks guys. I'll get the car back tomorrow and check the air bleed. Again
I thought about using a 95 master. 1-1/8" bore
And ditch the stock proportioning valve for a baer unit. Whaddya think?
As for drums. They're all new and set well. The pedal gets hard when the car is off, and it feels firm at idle. Haven't gotten her out on the road to test. I do hear a normal sounding hiss when I press the pedal at idle. There's good vacuum but that booster is old
Might be the weak link. I'll report tomorrow
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,053
9,196
224
Massachusetts
1 1/8" master is the 84-86 svo. It's too big.

1995 master cylinder is either 15/16" or 1 1/16". There is also a 1993 conra mc.


Drum brakes require very little fluid to operate. Swapping the front calipers shoudldnt change feel much. The stock mc is 21mm. I'd use the 15/16" mc if I were to change (or 1" 1993 cobra master since it's an easier install) if anything.

Read this post for some more clarification on sizing mc to calipers. Since the drums are staying constant, ignore them and focus on the fromts

http://www.stangnet.com/mustang-for...ke-conversion-upgrade-thread.html#post8075734
 

Chrome_Rust

Member
Dec 5, 2008
530
1
17
Findlay, Ohio
I have the same stuff on the front of my car, and I am running the 95 MC from a V6 car. SVO brakes in the rear is the only difference. But I ditched my factory prop valve, t'd the front brakes together, ran them to the rear port on my MC, t'd the rear together and have a wilwood Prop valve in the rear lineto set the bias, have the rear going to the front port. Car stops, not now, but NOW....
 

93project

Active Member
Apr 21, 2009
549
50
38
El Paso, tx
I have the same stuff on the front of my car, and I am running the 95 MC from a V6 car. SVO brakes in the rear is the only difference. But I ditched my factory prop valve, t'd the front brakes together, ran them to the rear port on my MC, t'd the rear together and have a wilwood Prop valve in the rear linesetupto set the bias, have the rear going to the front port. Car stops, not now, but NOW....
Sounds like a great setup. Do u think I'd need an aftermarket prop valve for the rear since I still have drums? Would u mind sharing pics of your MC line setup? Thanks
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,053
9,196
224
Massachusetts
I think you guys are missing my point. Disks vs drums on the rear is a huge technical difference. They need to be thought of differently in terms of MC selection.

Front caliper are increased from 5645mm^2 to 6220mm^2 which is in increase of 10% of total system surface area

going to the smallest disk MC (15/16" 94-95 Cobra) is an increase of 28% total surface area. (94-95 gt/v6 MC would result in a 65% larger master piston surface area)

That's why i said there just is no correct MC to use for retaining the rear drums. Rear disks require MUCH more fluid to operate than drums, so installing an "oversized" disk brake MC with drums may result in a stiffer pedal...sometimes not a desireable thing. Sometimes, the stock MC/booster is best when ONLY swapping the front stuff and leaving the rear drums

Swap rear disks on...completely different story. It's a major difference
 

SMOKEDYA

Well-Known Member
Jul 13, 2003
3,605
4
59
Tucson AZ
What i noticed when i installed my 93 cobra M/C, is that it says to messure the distance of the piston.Then adjust out the rod in the booster.....Maybe you need to check this to be for certian??????peace













john:p
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,053
9,196
224
Massachusetts
Adjusting the pushrod takes up dead travel. If you have never unbolted the mc from the booster, it's more than likely okay. Adjusting it out will preload the mc and may cause format caliper drag.

Let me ask you this, I know this is a poor test of brake skill, but can you lock the front wheels up?
 

93project

Active Member
Apr 21, 2009
549
50
38
El Paso, tx
Do you mean like hammer the pedal till it locks up and skid? No. It never locks up or makes the nose dive very hard..
It slows down and does dip the front a little but not like true non abs setups. It stops like it has an anti lock setup going haywire. Best way to describe it
i don't know what to do... I have so much to do besides put rear disc that it's far out on the horizon.
 
Thread starter Similar threads Forum Replies Date
R 66 Front disc brake conversion, Did a search and couldn't find an answer 1965 - 1973 Classic Mustangs -General/Talk- 4
purplefox93 Please Help I Have Searched For An Answer Everywhere Fox 5.0 Mustang Tech 17
T Couple Questions... Tried Searching With No Real Answers... 2005 - 2009 Specific Tech 7
L Engine Searched Didn't Find My Answer SN95 4.6L Mustang Tech 8
90lxwhite speedo gear, beat to death yes but every search yields different answers 1994 - 1995 Specific Tech 11
midnightdriver I did a search and found nothing that answer my ? 1996 - 2004 SN95 Mustang -General/Talk- 13
T Need answer quick & have searched w/ no luck! Will 1990 seats fit in an 03? 1996 - 2004 SN95 Mustang -General/Talk- 14
jeremy canter I searched and really not found the right answers. SVT Tech Forum 0
98bluevert Been searching cant find answer!!! SN95 4.6L Mustang Tech 5
91foxbodygt 4cyl and BBK Spring Ride Height Question; Searched & No answer Fox 5.0 Mustang Tech 4
D Search and Searched.. Still no postive answer 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
RedDaemon searched 4.6 tech, need some answers SN95 4.6L Mustang Tech 17
Pokageek Ok, I did the search and even thought I knew the answer..alternator wires? 1994 - 1995 Specific Tech 8
8 searched but no answers Fox 5.0 Mustang Tech 3
deadlast did a search, need a quick answer 1994 - 1995 Specific Tech 1
deadlast searched and looked, couldnt find answers... HELP Fox 5.0 Mustang Tech 6
J I searched, but I can't find my answer Fox 5.0 Mustang Tech 15
S I have searched this forum high and low and i have to seem too get a straight answer SN95 4.6L Mustang Tech 3
R I have searched the thread for my answer about gears. Fox 5.0 Mustang Tech 14
B Searched-no answer- Fox shocks/strut with Steeda Sports for 99-04 GT SN95 4.6L Mustang Tech 3
C clutch cable adjusting-no answer from search Fox 5.0 Mustang Tech 6
snakestang03 A suspension question that can't be answered through search Fox 5.0 Mustang Tech 7
1 Question about custom catbacks (searched but no answer). 1994 - 1995 Specific Tech 1
VIPERn94Five-0 lookin for a quick answer...i know i should just search but.... 1994 - 1995 Specific Tech 3
C I searched, still need answers Fox 5.0 Mustang Tech 10
DarkFox Electrical I've searched for wiring diagrams but did not find what I was looking for. Fox 5.0 Mustang Tech 4
M Gt40P headers search for SN95??? 1994 - 1995 Specific Tech 8
A Yet Another Cracked Aqua Dashpad Owner Searching For a Solution 1965 - 1973 Classic Mustangs -General/Talk- 0
J Searching for V6 Engine Plenum Cover (2005+ V6) 2005 - 2014 S-197 Mustang -General/Talk- 2
M First Fox Search 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
S Mach 1000 Head Unit Search Mustang Sound & Shine All 0
E In search of a roll cage kit for cobra 1974 - 1978 Mustang II Talk & Tech 3
bahndrvr Definitely not a new member (joined in 2005), but beyond searching I'll finally be posting:) New to me 1983 4-Eye Notch in my possession now:) The Welcome Wagon 4
B I search the previous owner of these car: 2013 Mustang GT Boss 302 modification in Gotta Have It Green 2005 - 2014 S-197 Mustang -General/Talk- 0
F 2015 GT Premium - Searching for quality spoiler 2015+ (S550) Mustang -General/Talk 1
C Transmission grenaded at 80 mph!!! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 22
gruvee87vertgt Fox Did Search, No Luck. What Yokes For Aluminum Driveshaft W/aod Trans? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
Chythar Car Runs Like A$$. A Search Says Bad Maf - What Do You Think? 1994 - 1995 Specific Tech 4
B Knocking Frontend (searched) SN95 4.6L Mustang Tech 2
gruvee87vertgt Did Search - No Luck Size Belt For Ac Eliminator & Underdrive Pulleys? Fox 5.0 Mustang Tech 2
Mfordy13 Title Search 1994 - 1995 Specific Tech 0
90lxwhite Who All Knew This (i Did A Search)? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
'94ChickStang Time For New Tires (yes I Already Searched) 1994 - 1995 Specific Tech 3
GT99BLACK High Idle, Hanging Rpms (i Promise I Searched) SN95 4.6L Mustang Tech 18
putnam88 Been Searching For Hours..... SN95 4.6L Mustang Tech 11
Blu50Stang In search of a fastback... 1965 - 1973 Classic Mustangs -General/Talk- 16
S search for head plugs Fox 5.0 Mustang Tech 10
CarMichael Angelo Engine B 234f head search 2.3L (N/A & Turbo) Tech 3
G 5 Lug Swap Tire Size Question (i Searched First) Fox 5.0 Mustang Tech 2
D Searching For 1976 Cobra Parts Other Classifieds 0
Similar threads