Brake pistons won't retract

JCStangGT

New Member
Jul 3, 2019
2
0
1
36
Connecticut
Hello! I have done some searching on the forums but have been unable to find anything. I have an 03 GT. Initially, when I purchased the car, I had issues with the driver side caliper sticking. Sticking to the point where the pads would smoke and heat up the wheel. Naturally, I replaced the caliper. Soon after, the passenger side did the same thing. So I replaced that caliper. The passenger side is still sticking. If you put the car in the air and spin the wheel, it will move. If you step on the brake the wheel stops. If you release the brake, the wheel wont budge. I feel I may have air in the lines or a vacuum issue, as the piston on a brand new caliper will not retract. Any ideas? Thank you in advance.
 
  • Sponsors(?)


KRUISR

Active Member
Apr 16, 2015
235
69
38
50
How are the slider pins? Does the caliper move freely on the pins when pistons retracted?
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,104
9,237
224
Massachusetts
99-04 GT calipers are notorious for having the pistons stick in the bores, especially if the car sits for some time or even over the winter. It's VERY common, and the solution is to replace the caliper. I wouldn't be surprised if a reman did it out of the box.

Consider upgrading tot he Cobra 13" setup. The pistons are metal and don't suffer the same issues. Plus 13" brakes
 

screamin gt

5 Year Member
Apr 9, 2007
394
6
28
central CT
99-04 GT calipers are notorious for having the pistons stick in the bores, especially if the car sits for some time or even over the winter. It's VERY common, and the solution is to replace the caliper. I wouldn't be surprised if a reman did it out of the box.

Consider upgrading tot he Cobra 13" setup. The pistons are metal and don't suffer the same issues. Plus 13" brakes
What else needs to change with the cobra brakes? Easy as just swapping calipers and rotors? Problems with wheel clearance? I have aftermarket wheels so theres no way to know if they will clear I guess until it's done.
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
33,104
9,237
224
Massachusetts
I put them on my 03GT.

just need calipers and the rotors. Might need banjo bolts as well. Pretty sure 99-04 brake lines were the same for GT and cobra.

they clear all 17” and larger wheels.
 
Thread starter Similar threads Forum Replies Date
9 Learn How To : Custom dual piston big brake install . (modification required) 1996 - 2004 SN95 Mustang -General/Talk- 0
cliff88145 Saleen 88 Saleen rear brakes caliper piston Special Production 0
1fastTbird SOLD Wilwood / Shelby 2005 - 2014 Mustang 4-piston Big Brake Kit, Front Wheels Tires Brakes 1
dmastinsc Rear Brake Piston Seized? 2010 - 2014 Specific Tech 3
XXL Expired __ Hawk Performance Talon 3-piston Brake System #hcks3005 For S-197 - New - Free Ship Wheels Tires Brakes 1
1fastTbird SOLD 2014 Gt500 15" Brembo 6-piston Front Brake Setup, Low Mileage Wheels Tires Brakes 0
1fastTbird SOLD Wilwood / Shelby 2005 - 2014 Mustang 6-piston Big Brake Kit, Front Wheels Tires Brakes 3
illwood Expired Brembo 4-piston 13 Inch Brakes Wheels Tires Brakes 2
1fastTbird SOLD Shelby Gt500 Brembo 14" 4-piston Front Brake Takeoff Set Wheels Tires Brakes 4
1fastTbird SOLD Shelby Gt500 Brembo 14" 4 Piston Front Brake Takeoff Set Wheels Tires Brakes 8
W SOLD 99-04 Mustang 4 Piston Rear Big Brake Kit 13.4" Rotor Wheels Tires Brakes 0
vladasap Expired Brand New - Cobra Front Brakes - Twin Piston - Original Ford Wheels Tires Brakes 0
W For Sale: 99-04 Mustang 4 Piston Rear Big Brake Kit 13.4" Rotor Wheels Tires Brakes 0
W FS: 6 piston Big Brake Kit 14" rotors Wheels Tires Brakes 1
L PBR Brake Piston Sticking SN95 4.6L Mustang Tech 8
Injected65 SSBC A120 4 piston Brake Kit Wheels/Tires/Brakes 0
S 2000 Cobra R Brembo 4 Piston Front Brakes, Slotted Rotors, Stainless Lines, Carbotech Suspension Parts 2
1993SSP Upgrading from 99 dual piston to cobra calipers, brake line question 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
estevaf Drum Brakes Piston Mustang II Parts 4
S rear brake piston bad? SN95 4.6L Mustang Tech 3
dubbsix Dual Piston Crown Vic Brakes on SN95 ? Fox 5.0 Mustang Tech 3
Seraphitia102 Pictures of custom brake job (SSBC 4 piston + Baer 2 piece rotors) and my new car 1996 - 2004 SN95 Mustang -General/Talk- 24
Seraphitia102 Does anyone know of some good 2 or 4 piston brake kits for the rear? (fixed calipers) SN95 4.6L Mustang Tech 20
P goin crazy tryin to compress my rear brake pistons on my 95 cobra? SVT Tech Forum 10
0 Rear brake Piston stuck SN95 4.6L Mustang Tech 7
Seraphitia102 Pictures of 4 piston brakes on the car 1996 - 2004 SN95 Mustang -General/Talk- 9
Seraphitia102 Massive amounts of brake dust with new SSBC 4 piston kit. Normal? 1996 - 2004 SN95 Mustang -General/Talk- 11
Seraphitia102 My new SSBC 4 piston brake kit came in! (pictures) 1996 - 2004 SN95 Mustang -General/Talk- 18
Seraphitia102 Does anyone have pictures of Mustangs with 4 and/or 6 piston brake kits? 1996 - 2004 SN95 Mustang -General/Talk- 3
D rear brake caliper piston wont compress. 1996 - 2004 SN95 Mustang -General/Talk- 2
Seraphitia102 4 piston brake caliper SN95 4.6L Mustang Tech 28
M Rear brakes help piston wont compress SN95 4.6L Mustang Tech 16
Guero Rear brake piston? 1994 - 1995 Specific Tech 7
E HELP!! Rear brake piston wont compress! SN95 4.6L Mustang Tech 10
go-stang5.0 Burnt Brake Piston Boots 1994 - 1995 Specific Tech 6
2 cant get rear brake piston to back in!! help SN95 4.6L Mustang Tech 15
bryan0 Fast, Stupid brake piston compression question... HELP SN95 4.6L Mustang Tech 3
W help: brake piston??? Fox 5.0 Mustang Tech 7
M Rear Brake Piston on 2000 question? SN95 V6 Mustang Tech 1
85MustGT Disk brake piston twist SN95 4.6L Mustang Tech 6
Jeff 81 SSBC 3 Piston Caliper plus 8.8 Brake Upgrade SN95 4.6L Mustang Tech 0
T3AL Hot many pistons are in the calapers of 93 front brakes? 2.3L (N/A & Turbo) Tech 4
94GTStang Dual Piston Brake Question... 1994 - 1995 Specific Tech 0
Kdubslugga How do i get the Brake Caliper Piston back in?? Fox 5.0 Mustang Tech 5
triggz Changed brake pads... 3 seized pistons? SN95 4.6L Mustang Tech 2
X help with brakes, piston wont compress Fox 5.0 Mustang Tech 11
Dan P. WTB/Trade 2008 E brake access cover Interior Exterior Parts 0
T I have no rear brakes 1996 - 2004 SN95 Mustang -General/Talk- 2
L Advice on 3rd brake light or not 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
L Clutch brake pedal problems 1965 Mustang Classic Mustang Specific Tech 3
Similar threads