1GN-IS300 ISF-FRONT BBK BRACKETS
These 1GN-IS300 ISF-FRONT BBK brackets are designed with motorsports forward, delivering precision and adaptability for high-performance braking systems. They come with the ability to adapt a thermal infrared laser unit to measure brake disc temperatures in real time, giving you critical data for optimal brake management. Engineered to work seamlessly with the 4 piston GS350 calipers or the ISF 6 piston calipers, these brackets ensure maximum compatibility and reliability. At Advanced Performance, we prioritize innovative solutions that elevate your vehicle's track and street performance with professional-grade components. Trust in brackets that combine cutting-edge technology with durable design for superior braking control.
These are the standard 2IS IS350 4-pot brakes.
1. 2013+ GS350 F-Sport FRONT CALIPERS
The 2013+ GS350 F-Sport uses a larger Advics 4-pot setup.
These are NOT the same as regular GS350/non-F brakes.
Important:
Uses 14" rotors (356mm)
Direct bolt-on to many Lexus knuckles
Same pad shape as IS350 4-pots
Requires 18"+ wheels
2. IS F FRONT CALIPERS (BREMBO)
The IS F uses true Brembo 6-piston front calipers.
Model
Caliper Type
Rotor Size
2008-2014 IS F
Brembo 6-piston
360x30mm
Key interchange info:
IS F calipers bolt onto many Lexus platforms
Typically paired with:
2013+ GS350 F-Sport rotors
RC350 F-Sport rotors
IS F OEM rotors are usually NOT used during swaps due to offset/hub differences.
Common swap:
IS F Brembos
GS350 F-Sport 356mm rotors
Direct bolt-on to:
3IS
4GS
RC
Some older IS chassis with adapters
3. GS F / RC F FRONT CALIPERS
The GS F and RC F share the newer-generation Brembo setup.
Model
Caliper Type
APES Rotor Size
GS F
Brembo 6-piston
380x34mm
RC F
Brembo 6-piston
380x34mm
These are:
Larger than IS F brakes
Require:
19"+ wheels usually
Larger rotors
Dust shield trimming
NOT directly interchangeable with IS F rotors/calipers without matching components.
4. INTERCHANGEABILITY SUMMARY
A. IS350 ↔ GS350 F-Sport
Item
Interchange?
Notes
Calipers
YES
Bolt pattern compatible
Rotors
NO
GS F-Sport uses larger 356mm
Pads
YES
Same pad profile
Brake lines
Usually YES
Minor variations possible
The GS350 F-Sport calipers are basically a spaced-out larger version of the IS350 4-pots.
B. IS F Brembos ↔ GS350 F-Sport Rotors
Item
Interchange?
IS F calipers + GS350 F-Sport rotors
YES
IS F calipers + IS350 rotors
NO
IS F rotors on GS350 F-Sport calipers
NO
This is the most common OEM Lexus BBK swap.
C. GS F / RC F ↔ IS F
Item
Interchange?
Notes
Calipers
Physically similar
Different sizing
Rotors
NO
GSF/RCF are 380mm
Wheels
Different clearance
Usually 19"+ required
5. IS300 BBK SWAPS
Swap
APES 2 Piece Rotor Used
Notes
IS350 4-pot upgrade
334mm IS350
GS350 F-Sport upgrade
356mm GS rotor
IS F Brembo swap
GS350 F-Sport 356mm
GS F / RC F swap
380mm
6. QUICK IDENTIFICATION GUIDE
Caliper
Pistons
Easy Visual
IS350
4
Smaller Advics
GS350 F-Sport
4
Larger Advics body
IS F
6
Brembo logo
GS F / RC F
6
Larger Brembo, thicker rotor

