BMW M4 GT4

Know everything about iRacing's BMW M4 GT4 including technical specs, braking tips and more.

Image © iRacing.com Motorsport Simulations

Chassis

Weight 3175 lbs

Drive RWD

Power

Engine 3.0 Liters

Power 455 bhp

Torque 360 lb-ft

Brakes

Type Manual Bias

Pad Compounds 3 Compounds

Electronics DSC Available

Bias Range

Adjustable

ABS

DSC Available

Downforce

Medium

Setup

Advanced

How the BMW M4 GT4 Handles Braking

The BMW M4 GT4 V2 features a sophisticated braking system with adjustable brake bias and three brake pad compounds. The bias adjustment allows you to shift braking force between the front and rear axles, with values above 50% sending more pressure to the front brakes. This increases stability in braking zones but also raises the risk of front lockups. Map brake bias to a rotary dial or button box for quick adjustments during sessions, as different corner types and fuel loads will require different settings.

The brake pad compounds offer a clear performance trade-off: Low provides maximum modulation but reduced stopping power, while Medium and High increase braking effectiveness at the cost of pedal feel. Most drivers find Medium pads strike the best balance for consistent lap times. Start with a forward brake bias and gradually move it rearward as you build confidence with trail-braking.

Braking stability is also influenced by suspension settings, particularly front bump damping and rear rebound stiffness. Increasing front compression damping accelerates weight transfer to the front tires during braking, improving initial bite but potentially making the car more pitch-sensitive. Higher rear rebound damping slows the pitch transition as you hit the brakes, which can enhance stability on turn entry but may delay weight transfer in rapid braking zones.

Grounded in official iRacing manual data

Practice in the App

Stop Guessing, Start Improving

Many drivers slam the brakes with all their strength, but the fastest modulate pressure, use the brake to rotate the car, and exit as fast as possible. Train that skill here.

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Browser-based training works with any racing pedals or controllers. Fanatec, Thrustmaster, Logitech, Simucube — no installation required.

Pro-Designed Exercises

Access exercises created by professional sim racers like Suellio Almeida. Learn the exact braking patterns used by the fastest drivers.

Import BMW M4 GT4 Telemetry

Drop your Garage61 lap CSV and extract braking data for every corner. Generate personalized practice exercises based on YOUR telemetry, not generic patterns.

Track Your Progress

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And There's Much More

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3 Essential Setup Tips

Tip 1

Brake Bias

Brake bias controls front/rear brake force distribution. Start with 56-58% front for most cars. Engine placement matters: front-engine cars need more front bias (58-62%), mid-engine cars run balanced (54-58%), rear-engine cars need less (50-54%). Understeering under braking? Add 1-2% front bias. Rear feels loose in braking zones? Reduce front bias by 1-2%.

Tip 2

Know Your Car

Check if your car has ABS, traction control, or brake mapping. ABS allows later braking but can increase stopping distance—adjust activation threshold in setup. High-downforce cars brake later and harder at speed but lose grip quickly as downforce bleeds off. Low-downforce cars require earlier, progressive braking with more trail-braking to rotate.

Tip 3

Quick Fixes

Locking fronts frequently? Reduce front bias 1-2% or brake earlier with gradual pressure. Car won't turn in under braking? Increase front bias 1% and practice trail-braking deeper into corners. Rear unstable in braking zones? Reduce rear bias or use smoother pedal release.

Master Your Braking

Common questions about braking in this car. Practice these techniques in our free app.

What's the best brake bias for the BMW M4 GT4?

Most cars work well starting with 56-58% front bias. Adjust based on behavior: if you're locking fronts frequently, reduce front bias by 1-2%. If the rear feels unstable under braking, increase front bias. Engine placement matters too—front-engine cars typically need more front bias (58-62%), while mid/rear-engine cars run more balanced (54-58%). Always adjust in small increments and test.

Does the BMW M4 GT4 have ABS or traction control?

Check your car's setup screen for available driver aids. Cars with ABS allow later, more aggressive braking but may increase stopping distances. If ABS is available, you can adjust its activation threshold in setup—higher thresholds give more control but require smoother inputs. Cars without ABS require progressive brake application to avoid lockups. Practice threshold braking in our app to develop the muscle memory for both scenarios.

Why do my brakes lock up in the BMW M4 GT4?

Brake lockups typically happen from: (1) Too much front brake bias—reduce by 1-2%. (2) Too aggressive initial brake application—practice progressive pressure buildup. (3) Trail-braking too deep into the corner—release brake pressure earlier. (4) Cold tires or brakes—take an extra warm-up lap. (5) Downforce loss at lower speeds—brake earlier and lighter through slow corners. Use our Hold Pressure and Threshold Braking exercises to build the sensitivity needed to stay just below the lockup point.

How late can I brake in the BMW M4 GT4 compared to similar cars?

Braking points depend on: (1) Downforce level—high-downforce cars brake 50-100ft later than low-downforce cars. (2) Weight—lighter cars brake later but have less grip margin. (3) Brake size and cooling—larger brakes handle repeated heavy braking better. (4) ABS availability—ABS cars can brake slightly later. Start conservative and move your braking point later by 5-10ft each lap until you find the limit. The key is consistency, not just maximum lateness.

How can I practice braking in the BMW M4 GT4?

Braking Lab offers free web-based exercises that work with any wheel/pedal setup—no download needed. Try Hold Pressure to develop steady brake application, Trail Braking to master corner entry, and Threshold Braking to find the lockup limit safely. Each exercise gives instant feedback and tracks your progress. Practice 10 minutes before your race session to build muscle memory that translates directly to the track.

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